Weather forecast for tomorrowFountain Valley, CA
Weather forecast for tomorrow
Monday Oct 19, 2026
- 81°F
- 64°F
Partly Cloudy
- Precip. probability: 6%
- Precipitation: 0"
- Wind: 9mphS 183°
- Humidity: 61%
- UV index: 6
- Sunrise: 7:00 am PDT
- Sunset: 6:13 pm PDT
- details ▼
Tomorrow, expect a partly sunny afternoon with variable cloud cover.
The maximum temperature will be a temperate 80.6°F, while the minimum temperature will be a breezy 64.4°F.
The maximum heat index, which calculates the temperature value influenced by the moisture in the air, is evaluated at 82.4°F.
Expect a warmer feel as the forecasted high matches September's 77.5°F, rather than October's average of 74.3°F.
Sunrise will be at 7:00 am and sunset at 6:13 pm; tomorrow's daylight will last for 11h and 13min.
The maximum temperature will be a temperate 80.6°F, while the minimum temperature will be a breezy 64.4°F.
The maximum heat index, which calculates the temperature value influenced by the moisture in the air, is evaluated at 82.4°F.
Expect a warmer feel as the forecasted high matches September's 77.5°F, rather than October's average of 74.3°F.
Sunrise will be at 7:00 am and sunset at 6:13 pm; tomorrow's daylight will last for 11h and 13min.
Hourly overview
Hourly temperatures
Warmest period: 12 pm - 3 pm 81°C.
Coldest hour: 6 am 66°C.
Coldest hour: 6 am 66°C.
Chance of precipitation
Highest chance: 3 am 13%.
Hourly weather forecast
- 12 am
- 70°F
- Feels like:70°F
Clear
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 2mphS 176°
- Humidity: 72%
- Pressure: 29.91"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 2 am
- 68°F
- Feels like:68°F
Clear
- Precip. probability: 12%
- Precipitation: 0"
- Wind: 1mphSE 125°
- Humidity: 79%
- Pressure: 29.91"Hg
- Visibility: 9mi
- UV index: 0
- details ▼
- 4 am
- 66°F
- Feels like:66°F
Mostly Clear
- Precip. probability: 12%
- Precipitation: 0"
- Wind: 2mphESE 117°
- Humidity: 80%
- Pressure: 29.88"Hg
- Visibility: 7mi
- UV index: 0
- details ▼
- 6 am
- 66°F
- Feels like:66°F
Mostly Clear
- Precip. probability: 8%
- Precipitation: 0"
- Wind: 2mphE 100°
- Humidity: 79%
- Pressure: 29.91"Hg
- Visibility: 7mi
- UV index: 0
- details ▼
Sunrise: 7:00 am
- 8 am
- 66°F
- Feels like:66°F
Partly Cloudy
- Precip. probability: 6%
- Precipitation: 0"
- Wind: 2mphE 89°
- Humidity: 78%
- Pressure: 29.91"Hg
- Visibility: 5mi
- UV index: 0
- details ▼
- 10 am
- 73°F
- Feels like:73°F
Mostly Sunny
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 2mphSSE 156°
- Humidity: 64%
- Pressure: 29.91"Hg
- Visibility: 8mi
- UV index: 3
- details ▼
- 12 pm
- 79°F
- Feels like:81°F
Mostly Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 6mphSSW 204°
- Humidity: 53%
- Pressure: 29.88"Hg
- Visibility: 10mi
- UV index: 6
- details ▼
- 2 pm
- 79°F
- Feels like:81°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 9mphSSW 205°
- Humidity: 52%
- Pressure: 29.85"Hg
- Visibility: 10mi
- UV index: 5
- details ▼
- 4 pm
- 77°F
- Feels like:79°F
Sunny
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 8mphSSW 213°
- Humidity: 53%
- Pressure: 29.83"Hg
- Visibility: 10mi
- UV index: 2
- details ▼
- 6 pm
- 73°F
- Feels like:73°F
Sunny
- Precip. probability: 3%
- Precipitation: 0"
- Wind: 6mphSSW 206°
- Humidity: 65%
- Pressure: 29.83"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
Sunset: 6:13 pm
- 8 pm
- 72°F
- Feels like:72°F
Clear
- Precip. probability: 6%
- Precipitation: 0"
- Wind: 4mphSSW 201°
- Humidity: 77%
- Pressure: 29.83"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 10 pm
- 70°F
- Feels like:70°F
Clear
- Precip. probability: 11%
- Precipitation: 0"
- Wind: 4mphS 184°
- Humidity: 81%
- Pressure: 29.85"Hg
- Visibility: 6mi
- UV index: 0
- details ▼
Tomorrow, on Monday, primarily clear and occasionally cloud-filled weather is expected.
The temperature will vary between the lowest temperature of 66.2°F and the highest temperature of 78.8°F. The warmest part of the day will be from noon to 3 pm.
The forecasted maximum is more comparable to September's typical high of 77.5°F than the average for October. The temperature low is forecasted to be resembling the usual October value of 62.1°F.
The temperature will vary between the lowest temperature of 66.2°F and the highest temperature of 78.8°F. The warmest part of the day will be from noon to 3 pm.
The forecasted maximum is more comparable to September's typical high of 77.5°F than the average for October. The temperature low is forecasted to be resembling the usual October value of 62.1°F.
Updated: Oct 18, 2026 @ 08:57:09 UTC
Published by: Weather Atlas | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Frequently asked questions
Tomorrow, a partly cloudy outlook will keep the sky interesting throughout the day.
Tomorrow, the maximum temperature will be 80.6°F, while the minimum temperature will be 64.4°F. The maximum heat index, which adjusts the air temperature based on humidity, is calculated to be 82.4°F.
The maximum temperature will be a couple of degrees higher than the average highest temperature of 74.3°F in October. The lowest temperature will be in line with the average low of 62.1°F.
The maximum temperature will be a couple of degrees higher than the average highest temperature of 74.3°F in October. The lowest temperature will be in line with the average low of 62.1°F.
On Monday, in Fountain Valley, sunrise will be at 7:00 am and sunset at 6:13 pm (PDT).
Tomorrow, the daylight will last for 11h and 13min.
