Weather for Saint Helena, California
Current Weather
55.9°F
Conditions: Clear
Humidity: 87%
Feels Like: 57°F
Wind: N 2.2 mph
Wind Gusts: 4.7 mph
Humidity: 87%
Feels Like: 57°F
Wind: N 2.2 mph
Wind Gusts: 4.7 mph
Pressure: 29.98 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 9 mi
UV Index: 0
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 9 mi
UV Index: 0
Five Day Weather Forecast
Sat
H: 81°F
L: 57°F
Sun
H: 83°F
L: 60°F
Mon
H: 81°F
L: 57°F
Tue
H: 81°F
L: 53°F
Wed
H: 74°F
L: 50°F
Air Quality
PM2.5:
13.45 μg/m3
PM10:
13.55 μg/m3
Carbon Monoxide: 175.85 μg/m3
Nitrogen Dioxide: 16.35 μg/m3
Sulphur Dioxide: 1.65 μg/m3
Ozone: 23 μg/m3
Nitrogen Dioxide: 16.35 μg/m3
Sulphur Dioxide: 1.65 μg/m3
Ozone: 23 μg/m3
Astronomical
Sunrise: 7:22 AM
Sun Transit: 12:54 AM
Sunset: 6:27 PM
Daylight: 11 hrs 5 mins
Sun Transit: 12:54 AM
Sunset: 6:27 PM
Daylight: 11 hrs 5 mins
Moonrise: 4:41 AM
Moon Transit: 11:00 AM
Moonset: 5:09 PM
Moon Phase: Waning Crescent
Moon Illumination: 5.2%
Moon Transit: 11:00 AM
Moonset: 5:09 PM
Moon Phase: Waning Crescent
Moon Illumination: 5.2%
Best Times for Fishing or Hunting
Major Periods
6:23 PM - 8:53 PM10:30 AM - 1:00 PM
Minor Periods
4:39 PM - 6:09 PM4:11 AM - 5:41 AM
Action Rating: 4 out of 5
Beach Hazards Statement issued October 17 at 12:36PM PDT until October 18 at 11:00PM PDT by NWS San Francisco CA
Effective: Fri October 17, 2025, 12:36 PM
Expires: Sat October 18, 2025, 5:00 AM
* WHAT...A long period northwesterly swell will result in an increased risk for sneaker waves and rip currents. * WHERE...San Francisco, Coastal North Bay Including Point Reyes National Seashore, San Francisco Peninsula Coast, Northern Monterey Bay, Southern Monterey Bay, and Big Sur Coast. * WHEN...From 8 PM PDT this evening through Saturday 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. Swimmers should always swim near a lifeguard.
Remain out of the water to avoid hazardous swimming conditions.
Saturday, October 18, 2025
Weather Forecast
Conditions: Sunny
Average Temperature: 66.9°F
Average Humidity: 52%
Average Temperature: 66.9°F
Average Humidity: 52%
Chance of Rain: 0%
Wind: 4.5 mph
UV Index: 1
Wind: 4.5 mph
UV Index: 1
Air Quality
AQI:
1 - Good
PM2.5:
14.26 μg/m3
PM10:
14.55 μg/m3
Carbon Monoxide: 188.53 μg/m3
Nitrogen Dioxide: 16.93 μg/m3
Sulphur Dioxide: 3.04 μg/m3
Ozone: 66.04 μg/m3
Nitrogen Dioxide: 16.93 μg/m3
Sulphur Dioxide: 3.04 μg/m3
Ozone: 66.04 μg/m3
Astronomical
Sunrise: 7:22 AM
Sun Transit: 12:54 AM
Sunset: 6:27 PM
Daylight: 11 hrs 5 mins
Sun Transit: 12:54 AM
Sunset: 6:27 PM
Daylight: 11 hrs 5 mins
Moonrise: 4:41 AM
Moon Transit: 11:00 AM
Moonset: 5:09 PM
Moon Phase: Waning Crescent
Moon Illumination: 5.2%
Moon Transit: 11:00 AM
Moonset: 5:09 PM
Moon Phase: Waning Crescent
Moon Illumination: 5.2%
Best Times for Fishing or Hunting
Major Periods
6:23 PM - 8:53 PM10:30 AM - 1:00 PM
Minor Periods
4:39 PM - 6:09 PM4:11 AM - 5:41 AM
Action Rating: 4 out of 5
Sunday, October 19, 2025
Weather Forecast
Conditions: Sunny
Average Temperature: 68.6°F
Average Humidity: 57%
Average Temperature: 68.6°F
Average Humidity: 57%
Chance of Rain: 0%
Wind: 6.5 mph
UV Index: 1
Wind: 6.5 mph
UV Index: 1
Air Quality
AQI:
2 - Moderate
PM2.5:
17.61 μg/m3
PM10:
17.87 μg/m3
Carbon Monoxide: 199.77 μg/m3
Nitrogen Dioxide: 15.01 μg/m3
Sulphur Dioxide: 3.62 μg/m3
Ozone: 83.88 μg/m3
Nitrogen Dioxide: 15.01 μg/m3
Sulphur Dioxide: 3.62 μg/m3
Ozone: 83.88 μg/m3
Astronomical
Sunrise: 7:23 AM
Sun Transit: 12:54 AM
Sunset: 6:25 PM
Daylight: 11 hrs 2 mins
Sun Transit: 12:54 AM
Sunset: 6:25 PM
Daylight: 11 hrs 2 mins
Moonrise: 5:41 AM
Moon Transit: 11:39 AM
Moonset: 5:29 PM
Moon Phase: Waning Crescent
Moon Illumination: 1.3%
Moon Transit: 11:39 AM
Moonset: 5:29 PM
Moon Phase: Waning Crescent
Moon Illumination: 1.3%
Best Times for Fishing or Hunting
Major Periods
7:03 PM - 9:33 PM11:09 AM - 1:39 PM
Minor Periods
4:59 PM - 6:29 PM5:11 AM - 6:41 AM
Action Rating: 3 out of 5
Monday, October 20, 2025
Weather Forecast
Conditions: Sunny
Average Temperature: 66.5°F
Average Humidity: 35%
Average Temperature: 66.5°F
Average Humidity: 35%
Chance of Rain: 0%
Wind: 6.5 mph
UV Index: 0.9
Wind: 6.5 mph
UV Index: 0.9
Air Quality
AQI:
2 - Moderate
PM2.5:
17.64 μg/m3
PM10:
18.66 μg/m3
Carbon Monoxide: 158.05 μg/m3
Nitrogen Dioxide: 14.07 μg/m3
Sulphur Dioxide: 2.77 μg/m3
Ozone: 66.4 μg/m3
Nitrogen Dioxide: 14.07 μg/m3
Sulphur Dioxide: 2.77 μg/m3
Ozone: 66.4 μg/m3
Astronomical
Sunrise: 7:24 AM
Sun Transit: 12:54 AM
Sunset: 6:24 PM
Daylight: 11 hrs mins
Sun Transit: 12:54 AM
Sunset: 6:24 PM
Daylight: 11 hrs mins
Moonrise: 6:41 AM
Moon Transit: 12:20 AM
Moonset: 5:51 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.0%
Moon Transit: 12:20 AM
Moonset: 5:51 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.0%
Best Times for Fishing or Hunting
Major Periods
7:44 PM - 10:14 PM11:50 AM - 2:20 PM
Minor Periods
5:21 PM - 6:51 PM6:11 AM - 7:41 AM
Action Rating: 4 out of 5
Tuesday, October 21, 2025
Weather Forecast
Conditions: Sunny
Average Temperature: 63.8°F
Average Humidity: 37%
Average Temperature: 63.8°F
Average Humidity: 37%
Chance of Rain: 0%
Wind: 5.8 mph
UV Index: 0
Wind: 5.8 mph
UV Index: 0
Air Quality
AQI:
2 - Moderate
PM2.5:
19.89 μg/m3
PM10:
21.03 μg/m3
Carbon Monoxide: 265.54 μg/m3
Nitrogen Dioxide: 22.49 μg/m3
Sulphur Dioxide: 3.4 μg/m3
Ozone: 47.08 μg/m3
Nitrogen Dioxide: 22.49 μg/m3
Sulphur Dioxide: 3.4 μg/m3
Ozone: 47.08 μg/m3
Astronomical
Sunrise: 7:25 AM
Sun Transit: 12:53 AM
Sunset: 6:23 PM
Daylight: 10 hrs 58 mins
Sun Transit: 12:53 AM
Sunset: 6:23 PM
Daylight: 10 hrs 58 mins
Moonrise: 7:41 AM
Moon Transit: 1:01 PM
Moonset: 6:15 PM
Moon Phase: New
Moon Illumination: 1.2%
Moon Transit: 1:01 PM
Moonset: 6:15 PM
Moon Phase: New
Moon Illumination: 1.2%
Best Times for Fishing or Hunting
Major Periods
8:26 PM - 10:56 PM12:31 AM - 3:01 PM
Minor Periods
5:45 PM - 7:15 PM7:11 AM - 8:41 AM
Action Rating: 4 out of 5
Wednesday, October 22, 2025
Weather Forecast
Conditions: Sunny
Average Temperature: 56.6°F
Average Humidity: 64%
Average Temperature: 56.6°F
Average Humidity: 64%
Chance of Rain: 0%
Wind: 7.8 mph
UV Index: 4
Wind: 7.8 mph
UV Index: 4
Air Quality
AQI:
0 -
PM2.5:
0 μg/m3
PM10:
0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3
Astronomical
Sunrise: 7:26 AM
Sun Transit: 12:53 AM
Sunset: 6:21 PM
Daylight: 10 hrs 55 mins
Sun Transit: 12:53 AM
Sunset: 6:21 PM
Daylight: 10 hrs 55 mins
Moonrise: 8:43 AM
Moon Transit: 1:45 PM
Moonset: 6:42 PM
Moon Phase: New
Moon Illumination: 0.0%
Moon Transit: 1:45 PM
Moonset: 6:42 PM
Moon Phase: New
Moon Illumination: 0.0%
Best Times for Fishing or Hunting
Major Periods
9:11 PM - 11:41 PM1:15 PM - 3:45 PM
Minor Periods
6:12 PM - 7:42 PM8:13 AM - 9:43 AM
Action Rating: 4 out of 5
The times presented here are based upon the solunar theory, which is the idea that the movements of
fish and other animals are affected by the location of the sun and moon. The major periods are
believed to be the times of the greatest animal activity and occur when the moon is directly
overhead or underfoot (lunar transits). The minor periods also see increased activity and
occur when the moon is rising or setting. The strongest activity occurs during full or new moons,
and the weakest during quarter or three quarter moons. This is indicated by the Action Rating.