Marine Weather and Tide Forecast for Atwater, CA
April 21, 2025 5:04 AM PDT (12:04 UTC) Change Location
![]() | Sunrise 6:17 AM Sunset 7:44 PM Moonrise 1:56 AM Moonset 11:52 AM |
PZZ535 Monterey Bay- 250 Am Pdt Mon Apr 21 2025
Today - Light and variable winds, becoming W around 5 kt late this morning and early afternoon, rising to 5 to 10 kt late. Seas 3 to 4 ft. Wave detail: nw 3 ft at 11 seconds and sw 2 ft at 16 seconds. Patchy dense fog until late afternoon.
Tonight - SW wind 5 to 10 kt, becoming nw after midnight. Seas 3 to 4 ft. Wave detail: nw 3 ft at 10 seconds and S 2 ft at 16 seconds. Patchy fog in the evening.
Tue - W wind around 5 kt, rising to 5 to 10 kt in the afternoon. Seas 3 to 4 ft. Wave detail: nw 4 ft at 10 seconds and S 2 ft at 17 seconds. Patchy fog in the morning.
Tue night - W wind 5 to 10 kt. Seas 3 to 5 ft. Wave detail: nw 4 ft at 10 seconds and S 2 ft at 16 seconds.
Wed - W wind 5 to 10 kt. Seas 3 to 5 ft. Wave detail: nw 4 ft at 10 seconds.
Wed night - W wind 10 to 15 kt, becoming nw 5 to 10 kt after midnight. Seas 3 to 5 ft. Wave detail: nw 4 ft at 10 seconds.
Thu - NW wind 5 to 10 kt, becoming W 10 to 15 kt in the afternoon. Seas 3 to 4 ft. Wave detail: nw 4 ft at 9 seconds.
Thu night - W wind 10 to 15 kt, becoming nw 5 to 10 kt after midnight. Seas 3 to 4 ft. Wave detail: nw 4 ft at 8 seconds.
Fri - NW wind 5 to 10 kt, becoming W 10 to 15 kt in the afternoon. Seas around 3 ft. Wave detail: nw 3 ft at 7 seconds.
Fri night - W wind 10 to 15 kt, becoming nw 5 to 10 kt after midnight. Seas 3 to 4 ft. Wave detail: nw 3 ft at 7 seconds.
locally lower winds and seas across sheltered portions of the bay.
locally lower winds and seas across sheltered portions of the bay.
PZZ500 250 Am Pdt Mon Apr 21 2025
Synopsis for the central california coast and bays including the Monterey bay - Greater farallones - .and cordell bank national marine sanctuaries - .
north to northwest winds continue to increase in the northern outer waters along with building north swell. Winds look to increase and spread across the outer waters into the work week. The gusty occasionally gale force northerly winds in the afternoon look to become more widespread into the mid week.
north to northwest winds continue to increase in the northern outer waters along with building north swell. Winds look to increase and spread across the outer waters into the work week. The gusty occasionally gale force northerly winds in the afternoon look to become more widespread into the mid week.
7 Day Forecast for Marine Location Near Atwater, CA

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Grant Line Canal (drawbridge) Click for Map Mon -- 03:00 AM PDT Moonrise Mon -- 04:37 AM PDT 2.67 feet High Tide Mon -- 06:21 AM PDT Sunrise Mon -- 09:19 AM PDT 1.50 feet Low Tide Mon -- 12:54 PM PDT Moonset Mon -- 02:19 PM PDT 3.09 feet High Tide Mon -- 07:47 PM PDT Sunset Mon -- 10:35 PM PDT -0.02 feet Low Tide Tide / Current data from XTide NOT FOR NAVIGATION |   |
Grant Line Canal (drawbridge), Old River, California, Tide feet
12 am |
0.7 |
1 am |
1.3 |
2 am |
1.8 |
3 am |
2.3 |
4 am |
2.6 |
5 am |
2.6 |
6 am |
2.4 |
7 am |
2 |
8 am |
1.7 |
9 am |
1.5 |
10 am |
1.6 |
11 am |
1.9 |
12 pm |
2.3 |
1 pm |
2.8 |
2 pm |
3.1 |
3 pm |
3 |
4 pm |
2.8 |
5 pm |
2.3 |
6 pm |
1.8 |
7 pm |
1.1 |
8 pm |
0.6 |
9 pm |
0.2 |
10 pm |
0 |
11 pm |
-0 |
Brandt Bridge Click for Map Mon -- 01:58 AM PDT 0.56 knots Max Flood Mon -- 03:00 AM PDT Moonrise Mon -- 04:50 AM PDT -0.00 knots Slack Mon -- 06:21 AM PDT Sunrise Mon -- 07:35 AM PDT -0.40 knots Max Ebb Mon -- 10:12 AM PDT 0.00 knots Slack Mon -- 12:31 PM PDT 0.45 knots Max Flood Mon -- 12:53 PM PDT Moonset Mon -- 02:47 PM PDT -0.00 knots Slack Mon -- 06:56 PM PDT -1.08 knots Max Ebb Mon -- 07:47 PM PDT Sunset Mon -- 11:24 PM PDT 0.00 knots Slack Tide / Current data from XTide NOT FOR NAVIGATION |   |
Brandt Bridge, San Joaquin River, California Current, knots
12 am |
0.4 |
1 am |
0.5 |
2 am |
0.6 |
3 am |
0.5 |
4 am |
0.2 |
5 am |
-0 |
6 am |
-0.3 |
7 am |
-0.4 |
8 am |
-0.4 |
9 am |
-0.3 |
10 am |
-0.1 |
11 am |
0.2 |
12 pm |
0.4 |
1 pm |
0.4 |
2 pm |
0.2 |
3 pm |
-0.1 |
4 pm |
-0.4 |
5 pm |
-0.8 |
6 pm |
-1 |
7 pm |
-1.1 |
8 pm |
-1 |
9 pm |
-0.8 |
10 pm |
-0.6 |
11 pm |
-0.2 |
Area Discussion for San Joaquin Valley/Hanford, CA
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FXUS66 KHNX 211135 AAB AFDHNX
Area Forecast Discussion...UPDATED National Weather Service Hanford CA 1015 PM PDT Sun Apr 20 2025
UPDATE
Updated AVIATION section.
KEY MESSAGES
1. Warming trend in temperatures through Tuesday.
2. Temperatures will see a cooling trend starting mid-week ahead of a disturbance moving into the area next weekend.
3. Locally breezy conditions expected across the Mojave Desert from the middle of next week into next weekend.
DISCUSSION
Will see sunny skies today as high resolution short range ensemble upper air analysis has ridging moving onto the West Coast today. Probability of Exceedance (PoE) of reaching 85 degrees is high during the early part of the week and then tapers-off later in the week. PoE of 85 degrees or greater will range from 70%-90% through Tuesday and lower to less then 20% by Thursday. Current surface pressure gradient from KSFO to KLAS sits at around 1mb. This translates into light winds across the district. As temperatures see a warming trend, winds will remain light and diurnally driven. Cooling will begin on Wednesday as temperatures drop to a few degrees below seasonal normal values (around 75 degrees) by Friday and Saturday.
Longer range upper-air ensemble analysis is leaning toward the introduction of a trough pattern near the weekend. While widespread precipitation is very unlikely across Central California, a decreasing temperatures and increasing winds have a higher probability of occurring. Longer range temperatures PoE analysis is showing a 50% chance of temperatures reaching 75 degrees on Saturday. With PoE of seeing even lower temperatures, confidence is high on a good cool-down by next weekend. At the same time, PoE for wind gusts will increase as percentages rise to 40%-60% during the Friday and Saturday time frame. At the moment, Sunday will see little change in temperatures and winds before a transition back to warming closer to Day-8 (Monday).
AVIATION
12Z: VFR conditions will prevail across the central CA interior thru 06Z Tuesday.
AIR QUALITY ISSUES
None.
CERTAINTY
The level of certainty for days 1 and 2 is high.
The level of certainty for days 3 through 7 is medium.
Certainty levels include low
medium
and high. Please visit www.weather.gov/hnx/certainty.html for additional information and/or to provide feedback.
HNX WATCHES/WARNINGS/ADVISORIES
None.
Area Forecast Discussion...UPDATED National Weather Service Hanford CA 1015 PM PDT Sun Apr 20 2025
UPDATE
Updated AVIATION section.
KEY MESSAGES
1. Warming trend in temperatures through Tuesday.
2. Temperatures will see a cooling trend starting mid-week ahead of a disturbance moving into the area next weekend.
3. Locally breezy conditions expected across the Mojave Desert from the middle of next week into next weekend.
DISCUSSION
Will see sunny skies today as high resolution short range ensemble upper air analysis has ridging moving onto the West Coast today. Probability of Exceedance (PoE) of reaching 85 degrees is high during the early part of the week and then tapers-off later in the week. PoE of 85 degrees or greater will range from 70%-90% through Tuesday and lower to less then 20% by Thursday. Current surface pressure gradient from KSFO to KLAS sits at around 1mb. This translates into light winds across the district. As temperatures see a warming trend, winds will remain light and diurnally driven. Cooling will begin on Wednesday as temperatures drop to a few degrees below seasonal normal values (around 75 degrees) by Friday and Saturday.
Longer range upper-air ensemble analysis is leaning toward the introduction of a trough pattern near the weekend. While widespread precipitation is very unlikely across Central California, a decreasing temperatures and increasing winds have a higher probability of occurring. Longer range temperatures PoE analysis is showing a 50% chance of temperatures reaching 75 degrees on Saturday. With PoE of seeing even lower temperatures, confidence is high on a good cool-down by next weekend. At the same time, PoE for wind gusts will increase as percentages rise to 40%-60% during the Friday and Saturday time frame. At the moment, Sunday will see little change in temperatures and winds before a transition back to warming closer to Day-8 (Monday).
AVIATION
12Z: VFR conditions will prevail across the central CA interior thru 06Z Tuesday.
AIR QUALITY ISSUES
None.
CERTAINTY
The level of certainty for days 1 and 2 is high.
The level of certainty for days 3 through 7 is medium.
Certainty levels include low
medium
and high. Please visit www.weather.gov/hnx/certainty.html for additional information and/or to provide feedback.
HNX WATCHES/WARNINGS/ADVISORIES
None.
Wind History for Redwood City, CA
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Airport Reports
Link to 1 hour of 5 minute data for KMER
Terminal Aerodrome Forecast (TAF) for KMER
Wind History Graph: MER
(wind in knots)GEOS Local Image of Central West Coast
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San Francisco Bay Area, CA,

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