Weather for Saint Helena, California
Current Weather
Humidity: 69%
Feels Like: 59.2°F
Wind: S 3.4 mph
Wind Gusts: 3.9 mph
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 9 mi
UV Index: 0.2
Five Day Weather Forecast
Tue
H: 70°F
L: 43°F
Wed
H: 59°F
L: 40°F
Thu
H: 61°F
L: 40°F
Fri
H: 63°F
L: 44°F
Sat
H: 68°F
L: 45°F
Air Quality
Nitrogen Dioxide: 41.35 μg/m3
Sulphur Dioxide: 4.45 μg/m3
Ozone: 5 μg/m3
Astronomical
Sun Transit: 12:00 AM
Sunset: 4:48 PM
Daylight: 9 hrs 39 mins
Moon Transit: 10:12 PM
Moonset: 4:28 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 93.7%
Best Times for Fishing or Hunting
Major Periods
4:44 AM - 7:14 AM12:00 AM - 12:00 AM
Minor Periods
2:20 PM - 3:50 PM3:58 AM - 5:28 AM
Action Rating: 3 out of 5
Coastal Flood Advisory issued December 1 at 6:47PM PST until December 7 at 3:00PM PST by NWS San Francisco CA
Effective: Mon December 1, 2025, 6:47 PM
Expires: Tue December 2, 2025, 9:30 AM
* WHAT...Up to 1.4 ft of inundation above ground level is possible in low lying areas near shorelines and tidal waterways. * WHERE...Bayshore locations along the San Francisco Bay and San Pablo Bay. * WHEN...From 6 AM Tuesday to 3 PM PST Sunday. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. * ADDITIONAL DETAILS...At the San Francisco tidal gauge high tide is expected to be 0.8 ft above normal (6.66 ft MLLW) at 8:24 AM Tuesday, 1.2 ft above normal (7.00 ft MLLW) at 9:04 AM Wednesday, 1.4 ft above normal (7.20 ft MLLW) at 9:48 AM Thursday, 1.4 ft above normal (7.23 ft MLLW) at 10:35 AM Friday, 1.2 ft above normal (7.08 ft MLLW) at 11:25 AM Saturday, and 0.9 ft above normal (6.75 ft MLLW) at 12:17 PM Sunday. High tide timing varies up to 90 minutes earlier or later along the Pacific Coast and throughout the San Francisco Bay respectively.
If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.
Beach Hazards Statement issued December 1 at 6:47PM PST until December 3 at 10:00PM PST by NWS San Francisco CA
Effective: Mon December 1, 2025, 6:47 PM
Expires: Tue December 2, 2025, 9:30 AM
* WHAT...Long period westerly swell will result in an increased risk for sneaker waves and strong rip currents. Breaking waves 10 to 14 feet, with long lulls of 10 to 20 minutes or more between largest sets. * WHERE...Pacific Coast beaches. * WHEN...Through Wednesday evening. * IMPACTS...Sneaker waves can unexpectedly run significantly farther up the beach than normal, including over rocks and jetties. Rip currents are typically more frequent and stronger in the vicinity of jetties, inlets, and piers.
Dangerous conditions are forecast along the shoreline. Hazards include sneaker waves, strong rip currents, and large breaking waves. Stay off the rocks and NEVER turn your back on the ocean!
Weather Forecast
Average Temperature: 51.7°F
Average Humidity: 53%
Wind: 3.8 mph
UV Index: 0.4
Air Quality
Nitrogen Dioxide: 22.35 μg/m3
Sulphur Dioxide: 2.59 μg/m3
Ozone: 32.32 μg/m3
Astronomical
Sun Transit: 12:00 AM
Sunset: 4:48 PM
Daylight: 9 hrs 39 mins
Moon Transit: 10:12 PM
Moonset: 4:28 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 93.7%
Best Times for Fishing or Hunting
Major Periods
4:44 AM - 7:14 AM12:00 AM - 12:00 AM
Minor Periods
2:20 PM - 3:50 PM3:58 AM - 5:28 AM
Action Rating: 3 out of 5
Weather Forecast
Average Temperature: 48.5°F
Average Humidity: 46%
Wind: 11.4 mph
UV Index: 0.3
Air Quality
Nitrogen Dioxide: 17.97 μg/m3
Sulphur Dioxide: 2.93 μg/m3
Ozone: 45.92 μg/m3
Astronomical
Sun Transit: 12:00 AM
Sunset: 4:48 PM
Daylight: 9 hrs 38 mins
Moon Transit: 11:14 PM
Moonset: 5:48 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 98.1%
Best Times for Fishing or Hunting
Major Periods
5:43 AM - 8:13 AM12:00 AM - 12:00 AM
Minor Periods
3:01 PM - 4:31 PM5:18 AM - 6:48 AM
Action Rating: 4 out of 5
Weather Forecast
Average Temperature: 49.5°F
Average Humidity: 42%
Wind: 4.5 mph
UV Index: 0.4
Air Quality
Nitrogen Dioxide: 14.59 μg/m3
Sulphur Dioxide: 2.48 μg/m3
Ozone: 36.44 μg/m3
Astronomical
Sun Transit: 12:00 AM
Sunset: 4:48 PM
Daylight: 9 hrs 37 mins
Moon Transit: 12:00 AM
Moonset: 7:08 AM
Moon Phase: Full
Moon Illumination: 99.9%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM6:47 AM - 9:17 AM
Minor Periods
3:53 PM - 5:23 PM6:38 AM - 8:08 AM
Action Rating: 4 out of 5
Weather Forecast
Average Temperature: 50.8°F
Average Humidity: 50%
Wind: 4.3 mph
UV Index: 0.5
Air Quality
Nitrogen Dioxide: 25.19 μg/m3
Sulphur Dioxide: 3.46 μg/m3
Ozone: 26.44 μg/m3
Astronomical
Sun Transit: 12:00 AM
Sunset: 4:48 PM
Daylight: 9 hrs 36 mins
Moon Transit: 12:21 AM
Moonset: 8:24 AM
Moon Phase: Full
Moon Illumination: 99.2%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM7:54 AM - 10:24 AM
Minor Periods
4:56 PM - 6:26 PM7:54 AM - 9:24 AM
Action Rating: 4 out of 5
Weather Forecast
Average Temperature: 53.5°F
Average Humidity: 69%
Wind: 2.9 mph
UV Index: 0.4
Air Quality
Nitrogen Dioxide: 42.46 μg/m3
Sulphur Dioxide: 5.53 μg/m3
Ozone: 9.62 μg/m3
Astronomical
Sun Transit: 12:00 AM
Sunset: 4:48 PM
Daylight: 9 hrs 35 mins
Moon Transit: 1:28 AM
Moonset: 9:27 AM
Moon Phase: Full
Moon Illumination: 96.0%
Best Times for Fishing or Hunting
Major Periods
12:58 AM - 3:28 AM9:01 AM - 11:31 AM
Minor Periods
6:10 PM - 7:40 PM8:57 AM - 10:27 AM
Action Rating: 3 out of 5