Weather forecast for 10 daysCosta Mesa, CA
Weather forecast for the weekend
Sunday Oct 18, 2026
- 82°F
- 64°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 9mphSW 234°
- Humidity: 41%
- UV index: 6
- Sunrise: 6:59 am PDT
- Sunset: 6:14 pm PDT
- details ▼
Tomorrow, in Costa Mesa, sunshine and minimal clouds are also in the outlook.
A temperature range of a moderately hot 82.4°F to a breezy 64.4°F is expected.
The maximum heat index, which integrates air moisture with ambient temperature, is assessed at 82.4°F.
Tomorrow, expect a warmer trend, with a high of 82.4°F more common in September.
Sunrise will be at 6:59 am and sunset at 6:14 pm; tomorrow's daylight will last for 11h and 16min.
A temperature range of a moderately hot 82.4°F to a breezy 64.4°F is expected.
The maximum heat index, which integrates air moisture with ambient temperature, is assessed at 82.4°F.
Tomorrow, expect a warmer trend, with a high of 82.4°F more common in September.
Sunrise will be at 6:59 am and sunset at 6:14 pm; tomorrow's daylight will last for 11h and 16min.
10-day overview
Daily temperatures
Warmest day: tomorrow 82°C.
Coldest day: Thursday 70°C.
Coldest day: Thursday 70°C.
Chance of precipitation
Highest chance: Thursday 77%.
Long-term weather forecast
- Saturday
- Oct 17, 2026
- min.
- 68°F
Partly Cloudy
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 4mphSE 124°
- Humidity: 44%
- UV index: 0
- Sunrise: 6:58 am PDT
- Sunset: 6:15 pm PDT
- details ▼
- Sunday
- Oct 18, 2026
- 82°F
- 64°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 9mphSW 234°
- Humidity: 41%
- UV index: 6
- Sunrise: 6:59 am PDT
- Sunset: 6:14 pm PDT
- details ▼
- Monday
- Oct 19, 2026
- 81°F
- 66°F
Partly Cloudy
- Precip. probability: 19%
- Precipitation: 0"
- Wind: 9mphS 183°
- Humidity: 63%
- UV index: 6
- Sunrise: 6:59 am PDT
- Sunset: 6:13 pm PDT
- details ▼
- Tuesday
- Oct 20, 2026
- 77°F
- 63°F
Sunny
- Precip. probability: 6%
- Precipitation: 0"
- Wind: 10mphS 176°
- Humidity: 68%
- UV index: 6
- Sunrise: 7:00 am PDT
- Sunset: 6:12 pm PDT
- details ▼
- Wednesday
- Oct 21, 2026
- 75°F
- 63°F
Showers
- Precip. probability: 56%
- Precipitation: 0.39"
- Wind: 11mphSSE 168°
- Humidity: 68%
- UV index: 5
- Sunrise: 7:01 am PDT
- Sunset: 6:10 pm PDT
- details ▼
- Thursday
- Oct 22, 2026
- 70°F
- 61°F
Thunderstorms
- Precip. probability: 77%
- Precipitation: 0.24"
- Wind: 9mphSSW 194°
- Humidity: 69%
- UV index: 4
- Sunrise: 7:02 am PDT
- Sunset: 6:09 pm PDT
- details ▼
- Friday
- Oct 23, 2026
- 73°F
- 61°F
Mostly Sunny
- Precip. probability: 13%
- Precipitation: 0"
- Wind: 8mphS 184°
- Humidity: 63%
- UV index: 5
- Sunrise: 7:03 am PDT
- Sunset: 6:08 pm PDT
- details ▼
- Saturday
- Oct 24, 2026
- 77°F
- 61°F
Mostly Sunny
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 9mphWNW 292°
- Humidity: 56%
- UV index: 5
- Sunrise: 7:04 am PDT
- Sunset: 6:07 pm PDT
- details ▼
- Sunday
- Oct 25, 2026
- 77°F
- 63°F
Partly Cloudy
- Precip. probability: 6%
- Precipitation: 0"
- Wind: 9mphS 180°
- Humidity: 56%
- UV index: 5
- Sunrise: 7:04 am PDT
- Sunset: 6:06 pm PDT
- details ▼
- Monday
- Oct 26, 2026
- 75°F
- 61°F
Partly Cloudy
- Precip. probability: 14%
- Precipitation: 0"
- Wind: 9mphS 190°
- Humidity: 57%
- UV index: 5
- Sunrise: 7:05 am PDT
- Sunset: 6:05 pm PDT
- details ▼
The weather will be unstable for the next ten days, and a mix of gloomy, mostly clear, rainy and lightning-active weather is predicted.
Rainfall is expected on Wednesday and Thursday.
There will be a considerable variation in temperature in the upcoming days. Highs will range from 69.8°F to 82.4°F, while the low temperature range extends from 60.8°F to 68°F.
Sunday is expected to be the warmest, reaching up to 82.4°F; Thursday will be the coldest day, with the highest temperature of 69.8°F.
Rainfall is expected on Wednesday and Thursday.
There will be a considerable variation in temperature in the upcoming days. Highs will range from 69.8°F to 82.4°F, while the low temperature range extends from 60.8°F to 68°F.
Sunday is expected to be the warmest, reaching up to 82.4°F; Thursday will be the coldest day, with the highest temperature of 69.8°F.
Updated: Oct 18, 2026 @ 03:52:13 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
Tomorrow, in Costa Mesa, expect bright skies and plenty of sunshine.
Tomorrow, the highest temperature in Costa Mesa will be 82.4°F, while the lowest temperature will be 64.4°F. The maximum heat index, which adjusts the air temperature based on humidity, is evaluated at 82.4°F.
The maximum temperature will be notably higher than the average highest temperature of 73°F in October. Tomorrow, the lowest temperature will be in line with the average low temperature.
The maximum temperature will be notably higher than the average highest temperature of 73°F in October. Tomorrow, the lowest temperature will be in line with the average low temperature.
On Sunday, in Costa Mesa, sunrise will be at 6:59 am and sunset at 6:14 pm (PDT).
Tomorrow, the daylight will last for 11h and 16min.
