Marine Weather and Tide Forecast for Los Osos, CA
April 21, 2025 11:57 PM PDT (06:57 UTC) Change Location
![]() | Sunrise 6:20 AM Sunset 7:41 PM Moonrise 1:51 AM Moonset 11:58 AM |
PZZ645 Point Piedras Blancas To Point Sal Westward Out To 10 Nm- 848 Pm Pdt Mon Apr 21 2025
Tonight - NW wind 5 to 10 kt this evening, becoming light. Seas 4 to 6 ft. Wave detail: nw 5 ft at 10 seconds and sw 2 ft at 16 seconds. Patchy fog.
Tue - Light winds, becoming W 10 to 15 kt in the afternoon. Seas 3 to 5 ft. Wave detail: nw 5 ft at 10 seconds and sw 2 ft at 17 seconds. Patchy fog.
Tue night - NW wind 10 to 15 kt, becoming light late. Seas 4 to 6 ft. Wave detail: nw 5 ft at 10 seconds and sw 2 ft at 16 seconds. Patchy fog.
Wed - NW wind 5 to 10 kt, becoming 10 to 20 kt with local gusts to 25 kt in the afternoon. Seas 4 to 6 ft. Wave detail: nw 6 ft at 10 seconds and sw 2 ft at 17 seconds. Patchy fog in the morning.
Wed night - NW wind 10 to 20 kt with local gusts to 25 kt in the evening, becoming 5 to 10 kt after midnight. Seas 5 to 7 ft. Wave detail: nw 6 ft at 10 seconds and sw 2 ft at 17 seconds.
Thu - NW wind 5 to 10 kt, becoming 10 to 20 kt in the afternoon. Seas 4 to 6 ft. Wave detail: nw 5 ft at 10 seconds and sw 2 ft at 16 seconds.
Thu night - NW wind 10 to 20 kt. Seas 4 to 6 ft. Wave detail: nw 5 ft at 10 seconds and sw 2 ft at 15 seconds.
Fri - NW wind 10 to 20 kt. Seas 4 to 5 ft. Wave detail: nw 4 ft at 8 seconds and sw 2 ft at 16 seconds.
Fri night - NW wind 15 to 25 kt, becoming 10 to 20 kt after midnight. Seas 4 to 5 ft. Wave detail: nw 5 ft at 7 seconds and sw 2 ft at 18 seconds.
Sat - N wind 10 to 15 kt, becoming nw 15 to 25 kt in the afternoon. Seas 4 to 6 ft. Wave detail: nw 5 ft at 9 seconds and S 3 ft at 18 seconds.
Sat night - NW wind 25 to 30 kt, becoming 15 to 25 kt after midnight. Seas 6 to 8 ft. Wave detail: nw 7 ft at 10 seconds and S 3 ft at 17 seconds.
PZZ600 848 Pm Pdt Mon Apr 21 2025
Synopsis for the southern california coast and santa barbara channel including the channel islands national marine sanctuary and national park - At 01z, or 6 pm pdt, a 1036 mb surface high was about 800 nm W of portland, while a 1010 mb surface low was over southern nevada.
7 Day Forecast for Marine Location Near Los Osos, CA

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Morro Bay Click for Map Mon -- 02:51 AM PDT Moonrise Mon -- 05:05 AM PDT 4.05 feet High Tide Mon -- 06:22 AM PDT Sunrise Mon -- 12:58 PM PDT Moonset Mon -- 01:03 PM PDT 0.17 feet Low Tide Mon -- 07:41 PM PDT Sunset Mon -- 08:00 PM PDT 3.07 feet High Tide Tide / Current data from XTide NOT FOR NAVIGATION |   |
Morro Bay, California, Tide feet
12 am |
2.9 |
1 am |
3 |
2 am |
3.3 |
3 am |
3.7 |
4 am |
3.9 |
5 am |
4.1 |
6 am |
3.9 |
7 am |
3.5 |
8 am |
2.9 |
9 am |
2.2 |
10 am |
1.5 |
11 am |
0.8 |
12 pm |
0.4 |
1 pm |
0.2 |
2 pm |
0.3 |
3 pm |
0.8 |
4 pm |
1.5 |
5 pm |
2.1 |
6 pm |
2.7 |
7 pm |
3 |
8 pm |
3.1 |
9 pm |
3 |
10 pm |
2.9 |
11 pm |
2.7 |
Port San Luis Click for Map Mon -- 02:50 AM PDT Moonrise Mon -- 04:14 AM PDT 4.34 feet High Tide Mon -- 06:22 AM PDT Sunrise Mon -- 12:11 PM PDT -0.15 feet Low Tide Mon -- 12:58 PM PDT Moonset Mon -- 07:32 PM PDT 3.68 feet High Tide Mon -- 07:40 PM PDT Sunset Tide / Current data from XTide NOT FOR NAVIGATION |   |
Port San Luis, California, Tide feet
12 am |
3.3 |
1 am |
3.6 |
2 am |
3.9 |
3 am |
4.2 |
4 am |
4.3 |
5 am |
4.3 |
6 am |
3.9 |
7 am |
3.3 |
8 am |
2.5 |
9 am |
1.6 |
10 am |
0.7 |
11 am |
0.1 |
12 pm |
-0.1 |
1 pm |
-0 |
2 pm |
0.5 |
3 pm |
1.2 |
4 pm |
2 |
5 pm |
2.8 |
6 pm |
3.3 |
7 pm |
3.6 |
8 pm |
3.7 |
9 pm |
3.5 |
10 pm |
3.1 |
11 pm |
2.9 |
Area Discussion for Los Angeles/Oxnard, CA
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FXUS66 KLOX 220348 AFDLOX
Area Forecast Discussion...UPDATED National Weather Service Los Angeles/Oxnard CA 848 PM PDT Mon Apr 21 2025
SYNOPSIS
21/658 PM.
Onshore flow will strengthen through the week and bring a cooling trend through Friday. Night through morning low clouds and fog will be a staple of the forecast, struggling to clear from beaches each day. Night through morning drizzle is possible toward mid-to-late week as the marine layer depth deepens substantially.
Gusty onshore winds are possible across the interior portions for the latter half of the week.
Area Forecast Discussion...UPDATED National Weather Service Los Angeles/Oxnard CA 848 PM PDT Mon Apr 21 2025
SYNOPSIS
21/658 PM.
Onshore flow will strengthen through the week and bring a cooling trend through Friday. Night through morning low clouds and fog will be a staple of the forecast, struggling to clear from beaches each day. Night through morning drizzle is possible toward mid-to-late week as the marine layer depth deepens substantially.
Gusty onshore winds are possible across the interior portions for the latter half of the week.
.SHORT TERM (MON-THU)...21/847 PM.
***UPDATE***
The marine layer is 1300 ft deep and is capped by a strong inversion. There is moderate onshore flow which is about 2 mb strong than it was 24 hours ago. These 2 things have combined to bring low clouds back into the coastal areas early this evening.
They will also combine to bring slow to no clearing tomorrow.
The marine layer and onshore push helped to lower max temps 1 to 3 degrees today across the coasts and vlys. The interior warmed 2 to 4 degrees under sunny skies. Max temps were a tale of two cities with cst and vlys temps 4 to 8 degree blo normal and the mtns and interior came in 4 to 8 degrees above normal.
Temps tomorrow will cool a few degrees more across the csts/vly as the marine layer continues to dominate. The interior will see similar temps
Forecast is in pretty good shape made small adjustments to temps and clouds.
***From Previous Discussion***
A series of weak to moderate upper level troughs moving through the West Coast this week will maintain cooler than normal temperatures across coast and coastal valleys this week. The marine layer depth this morning was around 1400 feet and forecast soundings indicate additional deepening of 500 to 1000 feet each day through at least Thursday. So while clouds were mostly confined to the coastal areas this morning, low clouds and fog will easily make it into the valleys overnight tonight and then again each night the rest of the week. And as usual with a deepening marine layer and increasing onshore flow, daytime temperatures will be cooling with highs mostly just in the 60s for coast/valleys by no later than Wednesday. May eventually see some morning drizzle as the marine layer deepens, especially the latter half of the week when the strongest of the troughs moves through the area.
Far interior areas like the Antelope Valley and interior SLO County will be cooling down as well as some of that cooler maritime air pushes farther inland but it will take until at least Wednesday for highs there to drop below normal.
With the increase in onshore flow to close to 9mb to the desert each afternoon, there will be increasing west to southwest winds there gusting to around 40 mph.
.LONG TERM (FRI-MON)...21/215 PM.
The cool pattern will continue through the weekend as the strongest of the troughs moves through Saturday which will likely be the coolest day. There's still quite a bit of disagreement in the models with regard to how deep the upper will be and whether there will be any precipitation beyond just the typical morning drizzle. The EPS ensembles have been pretty consistent the last few runs indicating at least a 60-70% chance of light rain north of Pt Conception dropping to around 10-20% in the south. Amounts would be under a tenth of an inch in most areas. Temperatures again just in the 60s with minimal afternoon clearing for coast and valleys.
A slow warming trend will begin Sunday but high temperatures will remain below normal through at least early next week.
AVIATION
22/0018Z.
At 2255Z at KLAX, the marine layer was 1300 feet deep. The top of the inversion was 2100 feet with a temperatures of 17 C.
Moderate confidence in TAFs (Good confidence in TAFs for KPMD and KWJF). Flight cat change timing may be off by +/- 90 minutes and cig hgts off by +/- 200 ft.
KLAX...Moderate confidence in TAF. Flight cat change timing may be off by +/- 90 minutes. There is a 15 percent chc of 200 ft cigs and a 25 percent chc of cigs no lower than 600 ft. No significant east wind component is expected.
KBUR...Moderate confidence in TAF. Flight cat change timing may be off by +/- 90 minutes. There is a 25 percent chc of 1/2SM FG VV002 conds 10Z-15Z.
MARINE
21/658 PM.
For the Outer Waters, high confidence in current forecast.
Through tonight, there is a 10% chance of local Small Craft Advisory (SCA) level wind gusts, mainly around Point Conception.
For Tuesday, there is a 30% chance of SCA level winds in the northwestern Outer Waters in the afternoon and evening. For Wednesday through Saturday, there is a 50-70% chance of SCA level winds across much of the outer waters, especially in the afternoon and overnight hours.
For the Inner Waters north of Point Sal, high confidence in current forecast. Tonight through Tuesday, high confidence in winds and seas remaining below SCA levels. For Wednesday through Saturday, there is a 30-50% chance of SCA level winds, mainly in the late afternoon through evening hours.
For the Inner Waters south of Point Conception, high confidence in current forecast. Tonight through Friday, high confidence in winds and seas remaining below SCA levels across most areas. The only exception will be the western half of the Santa Barbara Channel where there is a 30-40% chance of SCA level winds Wednesday and Thursday, and a 40-50% chance Friday and Saturday, mainly during the late afternoon through evening hours.
Chances for SCA conds increase over the weekend for the entire coastal waters.
LOX WATCHES/WARNINGS/ADVISORIES
CA...NONE.
PZ...NONE.
***UPDATE***
The marine layer is 1300 ft deep and is capped by a strong inversion. There is moderate onshore flow which is about 2 mb strong than it was 24 hours ago. These 2 things have combined to bring low clouds back into the coastal areas early this evening.
They will also combine to bring slow to no clearing tomorrow.
The marine layer and onshore push helped to lower max temps 1 to 3 degrees today across the coasts and vlys. The interior warmed 2 to 4 degrees under sunny skies. Max temps were a tale of two cities with cst and vlys temps 4 to 8 degree blo normal and the mtns and interior came in 4 to 8 degrees above normal.
Temps tomorrow will cool a few degrees more across the csts/vly as the marine layer continues to dominate. The interior will see similar temps
Forecast is in pretty good shape made small adjustments to temps and clouds.
***From Previous Discussion***
A series of weak to moderate upper level troughs moving through the West Coast this week will maintain cooler than normal temperatures across coast and coastal valleys this week. The marine layer depth this morning was around 1400 feet and forecast soundings indicate additional deepening of 500 to 1000 feet each day through at least Thursday. So while clouds were mostly confined to the coastal areas this morning, low clouds and fog will easily make it into the valleys overnight tonight and then again each night the rest of the week. And as usual with a deepening marine layer and increasing onshore flow, daytime temperatures will be cooling with highs mostly just in the 60s for coast/valleys by no later than Wednesday. May eventually see some morning drizzle as the marine layer deepens, especially the latter half of the week when the strongest of the troughs moves through the area.
Far interior areas like the Antelope Valley and interior SLO County will be cooling down as well as some of that cooler maritime air pushes farther inland but it will take until at least Wednesday for highs there to drop below normal.
With the increase in onshore flow to close to 9mb to the desert each afternoon, there will be increasing west to southwest winds there gusting to around 40 mph.
.LONG TERM (FRI-MON)...21/215 PM.
The cool pattern will continue through the weekend as the strongest of the troughs moves through Saturday which will likely be the coolest day. There's still quite a bit of disagreement in the models with regard to how deep the upper will be and whether there will be any precipitation beyond just the typical morning drizzle. The EPS ensembles have been pretty consistent the last few runs indicating at least a 60-70% chance of light rain north of Pt Conception dropping to around 10-20% in the south. Amounts would be under a tenth of an inch in most areas. Temperatures again just in the 60s with minimal afternoon clearing for coast and valleys.
A slow warming trend will begin Sunday but high temperatures will remain below normal through at least early next week.
AVIATION
22/0018Z.
At 2255Z at KLAX, the marine layer was 1300 feet deep. The top of the inversion was 2100 feet with a temperatures of 17 C.
Moderate confidence in TAFs (Good confidence in TAFs for KPMD and KWJF). Flight cat change timing may be off by +/- 90 minutes and cig hgts off by +/- 200 ft.
KLAX...Moderate confidence in TAF. Flight cat change timing may be off by +/- 90 minutes. There is a 15 percent chc of 200 ft cigs and a 25 percent chc of cigs no lower than 600 ft. No significant east wind component is expected.
KBUR...Moderate confidence in TAF. Flight cat change timing may be off by +/- 90 minutes. There is a 25 percent chc of 1/2SM FG VV002 conds 10Z-15Z.
MARINE
21/658 PM.
For the Outer Waters, high confidence in current forecast.
Through tonight, there is a 10% chance of local Small Craft Advisory (SCA) level wind gusts, mainly around Point Conception.
For Tuesday, there is a 30% chance of SCA level winds in the northwestern Outer Waters in the afternoon and evening. For Wednesday through Saturday, there is a 50-70% chance of SCA level winds across much of the outer waters, especially in the afternoon and overnight hours.
For the Inner Waters north of Point Sal, high confidence in current forecast. Tonight through Tuesday, high confidence in winds and seas remaining below SCA levels. For Wednesday through Saturday, there is a 30-50% chance of SCA level winds, mainly in the late afternoon through evening hours.
For the Inner Waters south of Point Conception, high confidence in current forecast. Tonight through Friday, high confidence in winds and seas remaining below SCA levels across most areas. The only exception will be the western half of the Santa Barbara Channel where there is a 30-40% chance of SCA level winds Wednesday and Thursday, and a 40-50% chance Friday and Saturday, mainly during the late afternoon through evening hours.
Chances for SCA conds increase over the weekend for the entire coastal waters.
LOX WATCHES/WARNINGS/ADVISORIES
CA...NONE.
PZ...NONE.
Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
MBXC1 | 3 mi | 97 min | 54°F | |||||
46215 - Diablo Canyon, CA (076) | 9 mi | 61 min | 53°F | 4 ft | ||||
CPXC1 | 12 mi | 48 min | NE 1.9 | 54°F | 30.02 | 51°F | ||
PSLC1 - 9412110 - Port San Luis, CA | 12 mi | 57 min | NNE 1.9G | 53°F | 54°F | 30.01 | ||
46011 - SANTA MARIA - 21 NM Northwest of Point Arguello, CA | 28 mi | 47 min | NNW 5.8G | 54°F |
Wind History for Port San Luis, CA
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Airport Reports
Airport | Dist | Age | Wind kt | Vis | Sky | Weather | Air | DewPt | RH | inHg |
Link to 1 hour of 5 minute data for KSBP
Terminal Aerodrome Forecast (TAF) for KSBP
Wind History Graph: SBP
(wind in knots)GEOS Local Image of Southwest
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Vandenberg AFB, CA,

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