Weather for Saint Helena, California
Current Weather
Humidity: 100%
Feels Like: 56°F
Wind: W 2.2 mph
Wind Gusts: 3.4 mph
Precipitation: 0 in
Cloud Cover: 100%
Visibility: 8 mi
UV Index: 0
Five Day Weather Forecast
Fri
H: 74°F
L: 52°F
Sat
H: 77°F
L: 51°F
Sun
H: 76°F
L: 54°F
Mon
H: 76°F
L: 55°F
Tue
H: 75°F
L: 56°F
Air Quality
Nitrogen Dioxide: 1.85 μg/m3
Sulphur Dioxide: 1.45 μg/m3
Ozone: 70 μg/m3
Astronomical
Sun Transit: 11:53 AM
Sunset: 5:03 PM
Daylight: 10 hrs 19 mins
Moon Transit: 1:38 AM
Moonset: 9:39 AM
Moon Phase: Full
Moon Illumination: 93.4%
Best Times for Fishing or Hunting
Major Periods
1:08 AM - 3:38 AM9:11 AM - 11:41 AM
Minor Periods
6:14 PM - 7:44 PM9:09 AM - 10:39 AM
Action Rating: 3 out of 5
Coastal Flood Advisory issued November 6 at 5:06PM PST until November 8 at 2:00PM PST by NWS San Francisco CA
Effective: Thu November 6, 2025, 5:06 PM
Expires: Fri November 7, 2025, 5:00 AM
* WHAT...Up to 1.2 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 8 AM Tuesday to 2 PM PST Saturday. * 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 1.1 ft above normal (7.0 ft MLLW) at 11:42 AM Friday, and 0.9 ft above normal (6.7 ft MLLW) at 12:31 PM Saturday. High tide timing varies up to 90 minutes earlier or later along the coast and throughout the 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.
Coastal Flood Advisory issued November 7 at 4:08AM PST until November 8 at 2:00PM PST by NWS San Francisco CA
Effective: Fri November 7, 2025, 4:08 AM
Expires: Fri November 7, 2025, 3:00 PM
* WHAT...Up to 1.2 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...Until 2 PM PST Saturday. * 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 1.1 ft above normal (7.0 ft MLLW) at 11:42 AM Friday, and 0.9 ft above normal (6.7 ft MLLW) at 12:31 PM Saturday. High tide timing varies up to 90 minutes earlier or later along the coast and throughout the 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.
Dense Fog Advisory issued November 7 at 1:42AM PST until November 7 at 10:00AM PST by NWS San Francisco CA
Effective: Fri November 7, 2025, 1:42 AM
Expires: Fri November 7, 2025, 10:00 AM
* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...North Bay Interior Valleys. * WHEN...Until 10 AM PST this morning. * IMPACTS...Low visibility could make driving conditions hazardous.
If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Beach Hazards Statement issued November 6 at 5:06PM PST until November 8 at 9:00AM PST by NWS San Francisco CA
Effective: Thu November 6, 2025, 5:06 PM
Expires: Fri November 7, 2025, 5:00 AM
* WHAT...A long period westerly swell will result in an increased risk for sneaker waves and rip currents with breaking waves of 14 to 19 feet. In favored locations breaking waves could reach 25 feet. * WHERE...Coastal North Bay and San Francisco Peninsula Coast. * WHEN...From 4 AM PST early this morning through Saturday morning. * 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.
Remain out of the water to avoid hazardous swimming conditions.
Beach Hazards Statement issued November 7 at 4:08AM PST until November 8 at 9:00AM PST by NWS San Francisco CA
Effective: Fri November 7, 2025, 4:08 AM
Expires: Fri November 7, 2025, 3:00 PM
* WHAT...A long period westerly swell will result in an increased risk for sneaker waves and rip currents with breaking waves of 14 to 19 feet. In favored locations breaking waves could reach 25 feet. * WHERE...Coastal North Bay and San Francisco Peninsula Coast. * WHEN...Until 9 AM PST Saturday. * 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.
Remain out of the water to avoid hazardous swimming conditions.
Weather Forecast
Average Temperature: 60.1°F
Average Humidity: 73%
Wind: 4.3 mph
UV Index: 0.7
Air Quality
Nitrogen Dioxide: 8.39 μg/m3
Sulphur Dioxide: 1.61 μg/m3
Ozone: 51.72 μg/m3
Astronomical
Sun Transit: 11:53 AM
Sunset: 5:03 PM
Daylight: 10 hrs 19 mins
Moon Transit: 1:38 AM
Moonset: 9:39 AM
Moon Phase: Full
Moon Illumination: 93.4%
Best Times for Fishing or Hunting
Major Periods
1:08 AM - 3:38 AM9:11 AM - 11:41 AM
Minor Periods
6:14 PM - 7:44 PM9:09 AM - 10:39 AM
Action Rating: 3 out of 5
Weather Forecast
Average Temperature: 60.1°F
Average Humidity: 49%
Wind: 4.5 mph
UV Index: 0.7
Air Quality
Nitrogen Dioxide: 15.36 μg/m3
Sulphur Dioxide: 2.22 μg/m3
Ozone: 46.04 μg/m3
Astronomical
Sun Transit: 11:53 AM
Sunset: 5:02 PM
Daylight: 10 hrs 17 mins
Moon Transit: 2:45 AM
Moonset: 10:48 AM
Moon Phase: Waning Gibbous
Moon Illumination: 86.7%
Best Times for Fishing or Hunting
Major Periods
2:15 AM - 4:45 AM10:17 AM - 12:47 AM
Minor Periods
7:20 PM - 8:50 PM10:18 AM - 11:48 AM
Action Rating: 2 out of 5
Weather Forecast
Average Temperature: 61.8°F
Average Humidity: 46%
Wind: 3.8 mph
UV Index: 0.7
Air Quality
Nitrogen Dioxide: 18.99 μg/m3
Sulphur Dioxide: 2.35 μg/m3
Ozone: 52.36 μg/m3
Astronomical
Sun Transit: 11:53 AM
Sunset: 5:01 PM
Daylight: 10 hrs 15 mins
Moon Transit: 3:50 AM
Moonset: 11:43 AM
Moon Phase: Waning Gibbous
Moon Illumination: 78.1%
Best Times for Fishing or Hunting
Major Periods
3:20 AM - 5:50 AM11:21 AM - 1:51 PM
Minor Periods
8:33 PM - 10:03 PM11:13 AM - 12:43 AM
Action Rating: 2 out of 5
Weather Forecast
Average Temperature: 62.9°F
Average Humidity: 50%
Wind: 3.6 mph
UV Index: 0.7
Air Quality
Nitrogen Dioxide: 18.69 μg/m3
Sulphur Dioxide: 2.28 μg/m3
Ozone: 51.68 μg/m3
Astronomical
Sun Transit: 11:53 AM
Sunset: 5:00 PM
Daylight: 10 hrs 13 mins
Moon Transit: 4:50 AM
Moonset: 12:27 AM
Moon Phase: Waning Gibbous
Moon Illumination: 68.0%
Best Times for Fishing or Hunting
Major Periods
4:20 AM - 6:50 AM12:19 AM - 2:49 PM
Minor Periods
9:46 PM - 11:16 PM11:57 AM - 1:27 PM
Action Rating: 3 out of 5
Weather Forecast
Average Temperature: 61.6°F
Average Humidity: 53%
Wind: 3.1 mph
UV Index: 0
Air Quality
Nitrogen Dioxide: 27.52 μg/m3
Sulphur Dioxide: 2.92 μg/m3
Ozone: 50.54 μg/m3
Astronomical
Sun Transit: 11:53 AM
Sunset: 4:59 PM
Daylight: 10 hrs 11 mins
Moon Transit: 5:44 AM
Moonset: 1:01 PM
Moon Phase: Waning Gibbous
Moon Illumination: 57.1%
Best Times for Fishing or Hunting
Major Periods
5:14 AM - 7:44 AM1:11 PM - 3:41 PM
Minor Periods
12:00 AM - 12:00 AM12:31 AM - 2:01 PM
Action Rating: 2 out of 5