Weather forecast for 10 daysSaint Helena, CA
Weather forecast for the weekend
Sunday Oct 18, 2026
- 81°F
- 46°F
Sunny
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 7mphSSW 206°
- Humidity: 49%
- UV index: 5
- Sunrise: 7:22 am PDT
- Sunset: 6:27 pm PDT
- details ▼
Today, in Saint Helena, sunny skies and pleasant visibility are expected.
Significant temperature fluctuations from a high of a moderately hot 80.6°F to a low of a chilly 46.4°F are forecasted.
The maximum heat index, which combines air temperature and relative humidity, is appraised at 80.6°F.
Today, meteorological data suggests the high will feel more like September, based on a forecast of 80.6°F.
Sunrise will be at 7:22 am and sunset at 6:27 pm; the daylight will last for 11h and 5min.
Significant temperature fluctuations from a high of a moderately hot 80.6°F to a low of a chilly 46.4°F are forecasted.
The maximum heat index, which combines air temperature and relative humidity, is appraised at 80.6°F.
Today, meteorological data suggests the high will feel more like September, based on a forecast of 80.6°F.
Sunrise will be at 7:22 am and sunset at 6:27 pm; the daylight will last for 11h and 5min.
10-day overview
Daily temperatures
Warmest day: today 81°C.
Coldest day: Wednesday 68°C.
Coldest day: Wednesday 68°C.
Chance of precipitation
Highest chance: Wednesday 42%.
Long-term weather forecast
- Sunday
- Oct 18, 2026
- 81°F
- 46°F
Sunny
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 7mphSSW 206°
- Humidity: 49%
- UV index: 5
- Sunrise: 7:22 am PDT
- Sunset: 6:27 pm PDT
- details ▼
- Monday
- Oct 19, 2026
- 70°F
- 45°F
Mostly Cloudy
- Precip. probability: 11%
- Precipitation: 0"
- Wind: 8mphWSW 239°
- Humidity: 62%
- UV index: 5
- Sunrise: 7:23 am PDT
- Sunset: 6:26 pm PDT
- details ▼
- Tuesday
- Oct 20, 2026
- 72°F
- 50°F
Cloudy
- Precip. probability: 22%
- Precipitation: 0.04"
- Wind: 4mphENE 78°
- Humidity: 58%
- UV index: 3
- Sunrise: 7:24 am PDT
- Sunset: 6:24 pm PDT
- details ▼
- Wednesday
- Oct 21, 2026
- 68°F
- 50°F
Showers
- Precip. probability: 42%
- Precipitation: 0.12"
- Wind: 4mphSSW 205°
- Humidity: 69%
- UV index: 2
- Sunrise: 7:25 am PDT
- Sunset: 6:23 pm PDT
- details ▼
- Thursday
- Oct 22, 2026
- 70°F
- 46°F
AM Showers
- Precip. probability: 33%
- Precipitation: 0.04"
- Wind: 6mphSW 228°
- Humidity: 74%
- UV index: 4
- Sunrise: 7:26 am PDT
- Sunset: 6:22 pm PDT
- details ▼
- Friday
- Oct 23, 2026
- 75°F
- 45°F
Partly Cloudy
- Precip. probability: 13%
- Precipitation: 0"
- Wind: 5mphENE 59°
- Humidity: 63%
- UV index: 4
- Sunrise: 7:27 am PDT
- Sunset: 6:20 pm PDT
- details ▼
- Saturday
- Oct 24, 2026
- 73°F
- 45°F
Mostly Sunny
- Precip. probability: 4%
- Precipitation: 0.04"
- Wind: 6mphS 191°
- Humidity: 56%
- UV index: 4
- Sunrise: 7:28 am PDT
- Sunset: 6:19 pm PDT
- details ▼
- Sunday
- Oct 25, 2026
- 70°F
- 43°F
Partly Cloudy
- Precip. probability: 24%
- Precipitation: 0"
- Wind: 7mphWSW 240°
- Humidity: 54%
- UV index: 4
- Sunrise: 7:29 am PDT
- Sunset: 6:18 pm PDT
- details ▼
- Monday
- Oct 26, 2026
- 70°F
- 43°F
Partly Cloudy
- Precip. probability: 19%
- Precipitation: 0"
- Wind: 5mphS 180°
- Humidity: 55%
- UV index: 4
- Sunrise: 7:30 am PDT
- Sunset: 6:17 pm PDT
- details ▼
- Tuesday
- Oct 27, 2026
- 72°F
- 41°F
Partly Cloudy
- Precip. probability: 12%
- Precipitation: 0"
- Wind: 5mphS 183°
- Humidity: 53%
- UV index: 4
- Sunrise: 7:31 am PDT
- Sunset: 6:15 pm PDT
- details ▼
Looking ahead, conditions suggest a period of cloud-filled, dry and sunny and damp weather is predicted.
Rainfall is anticipated on Tuesday through Thursday.
Temperature fluctuation will be noticeable throughout the forecast window. The temperature is expected to swing from 68°F up to 80.6°F, while the forecast minimum temperature falls between 41°F and 50°F.
Today is the warmest day, with a maximum temperature of 80.6°F; expect the coldest day on Wednesday with a high of 68°F.
Rainfall is anticipated on Tuesday through Thursday.
Temperature fluctuation will be noticeable throughout the forecast window. The temperature is expected to swing from 68°F up to 80.6°F, while the forecast minimum temperature falls between 41°F and 50°F.
Today is the warmest day, with a maximum temperature of 80.6°F; expect the coldest day on Wednesday with a high of 68°F.
Updated: Oct 18, 2026 @ 11:03:32 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Frequently asked questions
On Sunday, sunshine is forecasted under mostly clear skies.
Today, the highest temperature will be 80.6°F, while the lowest temperature will be 46.4°F. The maximum heat index, which combines relative humidity and air temperature, is evaluated at 80.6°F.
The maximum temperature will be moderately higher than the average highest temperature of 75°F in October. The lowest temperature today will be also moderately lower than the average low temperature.
The maximum temperature will be moderately higher than the average highest temperature of 75°F in October. The lowest temperature today will be also moderately lower than the average low temperature.
On Sunday, in Saint Helena, sunrise will be at 7:22 am and sunset at 6:27 pm (PDT).
In Saint Helena, today, there will be 11h and 5min of daylight.
