Marine Weather and Tide Forecast for Castro Valley, CA
April 30, 2025 7:26 AM PDT (14:26 UTC)
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![]() | Sunrise 6:11 AM Sunset 7:59 PM Moonrise 7:12 AM Moonset 11:08 PM |
PZZ531 San Francisco Bay South Of The Bay Bridge- 211 Am Pdt Wed Apr 30 2025
Rest of tonight - W wind around 5 kt. Waves around 2 ft or less.
Wed - W wind 5 to 10 kt. Waves around 2 ft or less.
Wed night - W wind 5 to 10 kt. Waves around 2 ft or less.
Thu - W wind 5 to 10 kt. Waves around 2 ft or less.
Thu night - W wind 5 to 10 kt. Waves around 2 ft or less.
Fri - W wind 5 to 10 kt, rising to 10 to 15 kt in the afternoon. Waves around 2 ft or less.
Fri night - W wind 15 to 20 kt. Waves around 2 ft or less.
Sat - W wind 15 to 20 kt, rising to 20 to 25 kt in the afternoon. Waves around 2 ft or less.
Sat night - W wind 25 to 30 kt, veering to nw 20 to 25 kt after midnight. Waves around 2 ft or less.
Sun - W wind 10 to 15 kt. Waves around 2 ft or less.
Sun night - W wind 10 to 15 kt, becoming sw 5 to 10 kt after midnight. Waves around 2 ft or less in the evening.
PZZ500 211 Am Pdt Wed Apr 30 2025
Synopsis for the central california coast and bays including the Monterey bay - Greater farallones - .and cordell bank national marine sanctuaries - .
strong northwesterly breezes with near-gale force gusts will continue over the outer waters through Thursday morning along with rough seas. Strong northwesterly breezes return Friday afternoon, strengthening to become gale-force by Saturday. Rough seas return to the outer waters by Saturday.
strong northwesterly breezes with near-gale force gusts will continue over the outer waters through Thursday morning along with rough seas. Strong northwesterly breezes return Friday afternoon, strengthening to become gale-force by Saturday. Rough seas return to the outer waters by Saturday.
7 Day Forecast for Marine Location Near Castro Valley, CA

NEW! Add second zone forecast
Roberts Landing Click for Map Wed -- 02:08 AM PDT 7.95 feet High Tide Wed -- 06:13 AM PDT Sunrise Wed -- 08:12 AM PDT Moonrise Wed -- 09:41 AM PDT -1.56 feet Low Tide Wed -- 04:32 PM PDT 6.00 feet High Tide Wed -- 07:58 PM PDT Sunset Wed -- 09:27 PM PDT 2.89 feet Low Tide Tide / Current data from XTide NOT FOR NAVIGATION |   |
Roberts Landing, 1.3 miles west of, San Francisco Bay, California, Tide feet
12 am |
6.1 |
1 am |
7.3 |
2 am |
7.9 |
3 am |
7.7 |
4 am |
6.7 |
5 am |
5.1 |
6 am |
3.1 |
7 am |
1.1 |
8 am |
-0.5 |
9 am |
-1.4 |
10 am |
-1.5 |
11 am |
-0.8 |
12 pm |
0.5 |
1 pm |
2.1 |
2 pm |
3.7 |
3 pm |
5.1 |
4 pm |
5.9 |
5 pm |
5.9 |
6 pm |
5.3 |
7 pm |
4.4 |
8 pm |
3.5 |
9 pm |
2.9 |
10 pm |
3 |
11 pm |
3.7 |
Oakland Airport SW Click for Map Wed -- 01:58 AM PDT -0.00 knots Slack Wed -- 05:23 AM PDT -1.13 knots Max Ebb Wed -- 06:14 AM PDT Sunrise Wed -- 08:12 AM PDT Moonrise Wed -- 09:08 AM PDT 0.01 knots Slack Wed -- 12:30 PM PDT 0.83 knots Max Flood Wed -- 04:09 PM PDT -0.00 knots Slack Wed -- 06:05 PM PDT -0.42 knots Max Ebb Wed -- 07:58 PM PDT Sunset Wed -- 08:52 PM PDT 0.00 knots Slack Tide / Current data from XTide NOT FOR NAVIGATION |   |
Oakland Airport SW, South San Francisco Bay, California Current, knots
12 am |
0.5 |
1 am |
0.3 |
2 am |
-0 |
3 am |
-0.4 |
4 am |
-0.9 |
5 am |
-1.1 |
6 am |
-1.1 |
7 am |
-0.8 |
8 am |
-0.5 |
9 am |
-0.1 |
10 am |
0.3 |
11 am |
0.6 |
12 pm |
0.8 |
1 pm |
0.8 |
2 pm |
0.7 |
3 pm |
0.4 |
4 pm |
0.1 |
5 pm |
-0.3 |
6 pm |
-0.4 |
7 pm |
-0.3 |
8 pm |
-0.2 |
9 pm |
0 |
10 pm |
0.2 |
11 pm |
0.4 |
Area Discussion for San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 301123 AFDMTR
Area Forecast Discussion National Weather Service San Francisco CA Issued by National Weather Service Eureka CA 423 AM PDT Wed Apr 30 2025
New AVIATION, MARINE
SYNOPSIS
Issued at 1203 AM PDT Wed Apr 30 2025
While we could see some fog and a few isolated rain drops today, overall fair conditions will persist through Friday. A cold front will bring strong winds, cooler temperatures, and a slight chance for rain this weekend.
SHORT TERM
(Today and tonight)
Issued at 1203 AM PDT Wed Apr 30 2025
The threat for fog returns later this morning. The marine layer is currently around 1,000 feet according to area profilers. With some light dry offshore wind in the North Bay, the best chance for fog is along the San Francisco Peninsula coast and Monterey Bay region, including Big Sur and the Salinas Valley. A few upper level clouds and some wind could limit radiation fog, but even so, the typical foothill locations will almost certainly be dealing with reduced visibility in the marine layer cloud deck. Slightly elevated coastal areas such as Corallitos and Hurricane Point have the best chance.
A weak short wave trough is moving from north to south across California today. This system will bring slightly colder air to the upper levels while the surface temperature remains warm. With relatively high moisture (PW around 0.8") and conditionally unstable lapse rates, there is a chance for some isolated convection today. In fact the HRRR, NAM, and ECMWF deterministic model soundings for Santa Rosa all agree that the MUCAPE will exceed 1,000 J/kg this afternoon. On the other hand, some weak offshore winds will keep the low-level moisture suppressed and there will be a bit of convective inhibition below the LCL. Most likely if this convection is realized, it will only create some puffy cumulus clouds. There is very little support in the guidance for thunderstorms, or even rain, but there is still a non-zero chance based on the instability and relatively high integrated moisture.
LONG TERM
(Thursday through Tuesday)
Issued at 1203 AM PDT Wed Apr 30 2025
By Thursday the weak disturbance and associated instability will move into southern California. This will allow the ridge to rebuild over northern and central California, bringing us another day of warm inland temperatures and cool marine layer conditions along the coast. Temperatures will start to fall a bit on Friday as a much more robust trough approaches the coast. This system will support a fast moving cold front at the surface late Friday or early Saturday, and could bring some pre-frontal rain. The models have almost universally backed off on the rain chances, but we still have PoPs around 15%. While we expect overcast skies and much cooler temperatures, the biggest story with this system is wind. The trough will spawn a cut-off low that moves into Southern California by Saturday. The gradient between the low and higher pressure over the Eastern Pacific will support 50-70 mph winds at 500 mb. As the atmosphere becomes well mixed Saturday afternoon, some of this momentum will transfer down to the surface where NW winds of 15-30 mph, and gusts as high as 50 mph are expected. The strongest winds will be along the coast and in higher terrain.
By Sunday the low will start to move inland towards the desert Southwest. We will still be dealing with lingering strong winds, but it should be an improvement over Saturday. Early next week a ridge will start to rebuild, decreasing the wind speed and causing the temperatures will gradually recover. By mid-week we should be back to the nice seasonal weather we've had this week.
AVIATION
(12Z TAFS)
Issued at 406 AM PDT Wed Apr 30 2025
Currently a mixed bag of VFR-IFR at the terminals. The marine layer depth is at 1,600 feet and is expected to deepen as a shortwave trough traverses the region from north to south. As a result, ceilings and visibilities will be relatively higher in addition to being able to mix out relatively quicker. VFR is expected by this afternoon with clouds sticking to the coast.
Winds will be diurnal through the TAF period.
Vicinity of SFO...Currently VFR with westerly flow. It's going to be another nail biter this morning with IFR/MVFR stratus to the north of OAK and SFO within the San Francisco Bay. The time period of possibility for stratus to make a run at the terminal is between now and 17Z.
SFO Bridge Approach...Similar to SFO.
Monterey Bay Terminals...Currently IFR with westerly flow at MRY and IFR with northerly flow at SNS. Both terminals will begin to gradually improve by mid-to-late morning, but low clouds are expected to hug the coast throughout the day. Diurnal winds will prevail through the TAF period with a return to IFR conditions towards the end of the TAF period.
MARINE
(Today through Monday)
Issued at 406 AM PDT Wed Apr 30 2025
Strong northwesterly breezes with near-gale force gusts will continue over the outer waters through Thursday morning along with rough seas. Strong northwesterly breezes return Friday afternoon, strengthening to become gale-force by Saturday. Rough seas return to the outer waters by Saturday.
MTR WATCHES/WARNINGS/ADVISORIES
CA...None.
PZ...Small Craft Advisory until 9 AM PDT this morning for Pigeon Pt to Pt Pinos 10-60 NM-Pt Arena to Pt Reyes 0-10 nm.
Small Craft Advisory until 3 PM PDT Thursday for Pt Arena to Pt Reyes 10-60 NM.
Area Forecast Discussion National Weather Service San Francisco CA Issued by National Weather Service Eureka CA 423 AM PDT Wed Apr 30 2025
New AVIATION, MARINE
SYNOPSIS
Issued at 1203 AM PDT Wed Apr 30 2025
While we could see some fog and a few isolated rain drops today, overall fair conditions will persist through Friday. A cold front will bring strong winds, cooler temperatures, and a slight chance for rain this weekend.
SHORT TERM
(Today and tonight)
Issued at 1203 AM PDT Wed Apr 30 2025
The threat for fog returns later this morning. The marine layer is currently around 1,000 feet according to area profilers. With some light dry offshore wind in the North Bay, the best chance for fog is along the San Francisco Peninsula coast and Monterey Bay region, including Big Sur and the Salinas Valley. A few upper level clouds and some wind could limit radiation fog, but even so, the typical foothill locations will almost certainly be dealing with reduced visibility in the marine layer cloud deck. Slightly elevated coastal areas such as Corallitos and Hurricane Point have the best chance.
A weak short wave trough is moving from north to south across California today. This system will bring slightly colder air to the upper levels while the surface temperature remains warm. With relatively high moisture (PW around 0.8") and conditionally unstable lapse rates, there is a chance for some isolated convection today. In fact the HRRR, NAM, and ECMWF deterministic model soundings for Santa Rosa all agree that the MUCAPE will exceed 1,000 J/kg this afternoon. On the other hand, some weak offshore winds will keep the low-level moisture suppressed and there will be a bit of convective inhibition below the LCL. Most likely if this convection is realized, it will only create some puffy cumulus clouds. There is very little support in the guidance for thunderstorms, or even rain, but there is still a non-zero chance based on the instability and relatively high integrated moisture.
LONG TERM
(Thursday through Tuesday)
Issued at 1203 AM PDT Wed Apr 30 2025
By Thursday the weak disturbance and associated instability will move into southern California. This will allow the ridge to rebuild over northern and central California, bringing us another day of warm inland temperatures and cool marine layer conditions along the coast. Temperatures will start to fall a bit on Friday as a much more robust trough approaches the coast. This system will support a fast moving cold front at the surface late Friday or early Saturday, and could bring some pre-frontal rain. The models have almost universally backed off on the rain chances, but we still have PoPs around 15%. While we expect overcast skies and much cooler temperatures, the biggest story with this system is wind. The trough will spawn a cut-off low that moves into Southern California by Saturday. The gradient between the low and higher pressure over the Eastern Pacific will support 50-70 mph winds at 500 mb. As the atmosphere becomes well mixed Saturday afternoon, some of this momentum will transfer down to the surface where NW winds of 15-30 mph, and gusts as high as 50 mph are expected. The strongest winds will be along the coast and in higher terrain.
By Sunday the low will start to move inland towards the desert Southwest. We will still be dealing with lingering strong winds, but it should be an improvement over Saturday. Early next week a ridge will start to rebuild, decreasing the wind speed and causing the temperatures will gradually recover. By mid-week we should be back to the nice seasonal weather we've had this week.
AVIATION
(12Z TAFS)
Issued at 406 AM PDT Wed Apr 30 2025
Currently a mixed bag of VFR-IFR at the terminals. The marine layer depth is at 1,600 feet and is expected to deepen as a shortwave trough traverses the region from north to south. As a result, ceilings and visibilities will be relatively higher in addition to being able to mix out relatively quicker. VFR is expected by this afternoon with clouds sticking to the coast.
Winds will be diurnal through the TAF period.
Vicinity of SFO...Currently VFR with westerly flow. It's going to be another nail biter this morning with IFR/MVFR stratus to the north of OAK and SFO within the San Francisco Bay. The time period of possibility for stratus to make a run at the terminal is between now and 17Z.
SFO Bridge Approach...Similar to SFO.
Monterey Bay Terminals...Currently IFR with westerly flow at MRY and IFR with northerly flow at SNS. Both terminals will begin to gradually improve by mid-to-late morning, but low clouds are expected to hug the coast throughout the day. Diurnal winds will prevail through the TAF period with a return to IFR conditions towards the end of the TAF period.
MARINE
(Today through Monday)
Issued at 406 AM PDT Wed Apr 30 2025
Strong northwesterly breezes with near-gale force gusts will continue over the outer waters through Thursday morning along with rough seas. Strong northwesterly breezes return Friday afternoon, strengthening to become gale-force by Saturday. Rough seas return to the outer waters by Saturday.
MTR WATCHES/WARNINGS/ADVISORIES
CA...None.
PZ...Small Craft Advisory until 9 AM PDT this morning for Pigeon Pt to Pt Pinos 10-60 NM-Pt Arena to Pt Reyes 0-10 nm.
Small Craft Advisory until 3 PM PDT Thursday for Pt Arena to Pt Reyes 10-60 NM.
Wind History for Alameda, CA
toggle option: (graph/table)
Airport Reports
Airport | Dist | Age | Wind kt | Vis | Sky | Weather | Air | DewPt | RH | inHg |
KHWD HAYWARD EXECUTIVE,CA | 4 sm | 32 min | WNW 03 | 8 sm | Overcast | 55°F | 48°F | 77% | 29.98 | |
KOAK METROPOLITAN OAKLAND INTL,CA | 8 sm | 33 min | W 07 | 8 sm | Mostly Cloudy | 54°F | 48°F | 82% | 29.99 | |
KLVK LIVERMORE MUNI,CA | 13 sm | 33 min | calm | 10 sm | Clear | 50°F | 46°F | 87% | 29.97 | |
KPAO PALO ALTO,CA | 17 sm | 39 min | calm | 7 sm | Mostly Cloudy | Haze | 55°F | 52°F | 88% | 29.98 |
KSQL SAN CARLOS,CA | 17 sm | 31 min | S 03 | 10 sm | Overcast | 55°F | 52°F | 88% | 29.99 | |
KSFO SAN FRANCISCO INTL,CA | 18 sm | 30 min | calm | 10 sm | Mostly Cloudy | 52°F | 48°F | 87% | 29.98 | |
KCCR BUCHANAN FIELD,CA | 19 sm | 33 min | S 05 | 10 sm | Clear | 55°F | 50°F | 82% | 29.96 | |
KNUQ MOFFETT FEDERAL AFLD,CA | 20 sm | 31 min | ESE 05 | 8 sm | Overcast | 54°F | 50°F | 88% | 29.98 |
Link to 1 hour of 5 minute data for KHWD
Terminal Aerodrome Forecast (TAF) for KHWD
Wind History Graph: HWD
(wind in knots)GEOS Local Image of Central West Coast
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San Francisco Bay Area, CA,

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