Weather forecast for 10 daysFountain Valley, CA
Weather forecast for the weekend
Sunday Oct 18, 2026
- 84°F
- 66°F
Sunny
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 11mphW 280°
- Humidity: 40%
- UV index: 6
- Sunrise: 6:59 am PDT
- Sunset: 6:14 pm PDT
- details ▼
Today, on Sunday, October 18, sunny skies and pleasant visibility are expected.
The highest temperature will be a moderately hot 84.2°F, while the lowest anticipated temperature is an enjoyable 66.2°F.
The maximum heat index, which combines relative humidity and air temperature, is computed to be 84.2°F.
Today, meteorological data suggests the high will feel more like September, based on a forecast of 84.2°F.
Sunrise will be at 6:59 am and sunset at 6:14 pm; the daylight will last for 11h and 15min.
The highest temperature will be a moderately hot 84.2°F, while the lowest anticipated temperature is an enjoyable 66.2°F.
The maximum heat index, which combines relative humidity and air temperature, is computed to be 84.2°F.
Today, meteorological data suggests the high will feel more like September, based on a forecast of 84.2°F.
Sunrise will be at 6:59 am and sunset at 6:14 pm; the daylight will last for 11h and 15min.
10-day overview
Daily temperatures
Warmest day: today 84°C.
Coldest day: Thursday 72°C.
Coldest day: Thursday 72°C.
Chance of precipitation
Highest chance: Wednesday 84%.
Long-term weather forecast
- Sunday
- Oct 18, 2026
- 84°F
- 66°F
Sunny
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 11mphW 280°
- Humidity: 40%
- UV index: 6
- Sunrise: 6:59 am PDT
- Sunset: 6:14 pm PDT
- details ▼
- Monday
- Oct 19, 2026
- 79°F
- 64°F
Mostly Sunny
- Precip. probability: 8%
- Precipitation: 0"
- Wind: 9mphS 186°
- Humidity: 63%
- UV index: 6
- Sunrise: 7:00 am PDT
- Sunset: 6:13 pm PDT
- details ▼
- Tuesday
- Oct 20, 2026
- 77°F
- 64°F
AM Fog / PM Sun
- Precip. probability: 19%
- Precipitation: 0"
- Wind: 9mphS 185°
- Humidity: 68%
- UV index: 6
- Sunrise: 7:00 am PDT
- Sunset: 6:12 pm PDT
- details ▼
- Wednesday
- Oct 21, 2026
- 75°F
- 63°F
Rain
- Precip. probability: 84%
- Precipitation: 0.47"
- Wind: 12mphSSE 161°
- Humidity: 67%
- UV index: 5
- Sunrise: 7:01 am PDT
- Sunset: 6:11 pm PDT
- details ▼
- Thursday
- Oct 22, 2026
- 72°F
- 61°F
Scattered Thunderstorms
- Precip. probability: 53%
- Precipitation: 0.12"
- Wind: 9mphSSW 198°
- Humidity: 67%
- UV index: 6
- Sunrise: 7:02 am PDT
- Sunset: 6:09 pm PDT
- details ▼
- Friday
- Oct 23, 2026
- 75°F
- 61°F
Mostly Sunny
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 8mphSSW 209°
- Humidity: 59%
- UV index: 5
- Sunrise: 7:03 am PDT
- Sunset: 6:08 pm PDT
- details ▼
- Saturday
- Oct 24, 2026
- 79°F
- 61°F
Sunny
- Precip. probability: 3%
- Precipitation: 0"
- Wind: 8mphW 279°
- Humidity: 48%
- UV index: 5
- Sunrise: 7:04 am PDT
- Sunset: 6:07 pm PDT
- details ▼
- Sunday
- Oct 25, 2026
- 77°F
- 61°F
Partly Cloudy
- Precip. probability: 6%
- Precipitation: 0"
- Wind: 9mphS 172°
- Humidity: 53%
- UV index: 5
- Sunrise: 7:05 am PDT
- Sunset: 6:06 pm PDT
- details ▼
- Monday
- Oct 26, 2026
- 77°F
- 61°F
Partly Cloudy
- Precip. probability: 12%
- Precipitation: 0"
- Wind: 9mphSSW 193°
- Humidity: 55%
- UV index: 5
- Sunrise: 7:05 am PDT
- Sunset: 6:05 pm PDT
- details ▼
- Tuesday
- Oct 27, 2026
- 75°F
- 59°F
Partly Cloudy
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 9mphS 176°
- Humidity: 55%
- UV index: 5
- Sunrise: 7:06 am PDT
- Sunset: 6:04 pm PDT
- details ▼
No prolonged weather type is expected in the next ten days.
Rainfall is expected on Wednesday and Thursday.
Expect a substantial fluctuation in daytime highs in the next ten days. Maximum temperatures are forecasted between 71.6°F and 84.2°F, while the minimum temperature is forecast to range between 59°F and 66.2°F.
The hottest day is today, with a maximum temperature of 84.2°F; Thursday will be the coldest day, with the highest temperature of 71.6°F.
Rainfall is expected on Wednesday and Thursday.
Expect a substantial fluctuation in daytime highs in the next ten days. Maximum temperatures are forecasted between 71.6°F and 84.2°F, while the minimum temperature is forecast to range between 59°F and 66.2°F.
The hottest day is today, with a maximum temperature of 84.2°F; Thursday will be the coldest day, with the highest temperature of 71.6°F.
Updated: Oct 18, 2026 @ 11:37:18 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
Today, in Fountain Valley, the forecast calls for abundant sunshine.
Today, the maximum temperature will be 84.2°F, while the minimum temperature will be 66.2°F. The maximum heat index, which indicates how humid air affects the felt temperature, is appraised at 84.2°F.
Today, the maximum temperature will be notably higher than the average highest temperature of 74.3°F in October. The lowest temperature today will be slightly warmer than the average low temperature.
Today, the maximum temperature will be notably higher than the average highest temperature of 74.3°F in October. The lowest temperature today will be slightly warmer than the average low temperature.
On Sunday, in Fountain Valley, sunrise will be at 6:59 am and sunset at 6:14 pm (PDT).
Today, the daylight will last for 11h and 15min.
