Weather forecast for tomorrowCosta Mesa, CA
Weather forecast for tomorrow
Sunday Oct 18, 2026
- 82°F
- 64°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 9mphSW 234°
- Humidity: 42%
- UV index: 6
- Sunrise: 6:59 am PDT
- Sunset: 6:14 pm PDT
- details ▼
Tomorrow, on Sunday, sunshine and minimal clouds are also in the outlook.
Temperatures are forecasted to peak at a moderately hot 82.4°F and drop to a minimum of a comfortable 64.4°F.
The maximum heat index, which represents the influence of relative humidity on air temperature, is appraised at 82.4°F.
Tomorrow, the temperature will be higher and more consistent with September's typical high of 76.1°F than with October's 73°F.
Sunrise will be at 6:59 am and sunset at 6:14 pm; tomorrow's daylight will last for 11h and 16min.
Temperatures are forecasted to peak at a moderately hot 82.4°F and drop to a minimum of a comfortable 64.4°F.
The maximum heat index, which represents the influence of relative humidity on air temperature, is appraised at 82.4°F.
Tomorrow, the temperature will be higher and more consistent with September's typical high of 76.1°F than with October's 73°F.
Sunrise will be at 6:59 am and sunset at 6:14 pm; tomorrow's daylight will last for 11h and 16min.
Hourly overview
Hourly temperatures
Warmest period: 12 pm - 3 pm 82°C.
Coldest hour: 6 am 68°C.
Coldest hour: 6 am 68°C.
Chance of precipitation
Highest chance: 9 pm 2%.
Hourly weather forecast
- 12 am
- 73°F
- Feels like:73°F
Clear
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 4mphSSE 153°
- Humidity: 41%
- Pressure: 29.97"Hg
- Visibility: 9mi
- UV index: 0
- details ▼
- 2 am
- 72°F
- Feels like:72°F
Partly Cloudy
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 1mphE 99°
- Humidity: 48%
- Pressure: 29.97"Hg
- Visibility: 9mi
- UV index: 0
- details ▼
- 4 am
- 70°F
- Feels like:70°F
Clear
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 2mphENE 77°
- Humidity: 53%
- Pressure: 29.94"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 6 am
- 68°F
- Feels like:68°F
Clear
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 2mphENE 71°
- Humidity: 56%
- Pressure: 29.94"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
Sunrise: 6:59 am
- 8 am
- 70°F
- Feels like:70°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 2mphENE 59°
- Humidity: 54%
- Pressure: 29.94"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 10 am
- 79°F
- Feels like:79°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 2mphWSW 248°
- Humidity: 36%
- Pressure: 29.97"Hg
- Visibility: 10mi
- UV index: 3
- details ▼
- 12 pm
- 82°F
- Feels like:82°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 7mphSW 229°
- Humidity: 35%
- Pressure: 29.94"Hg
- Visibility: 10mi
- UV index: 6
- details ▼
- 2 pm
- 82°F
- Feels like:82°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 9mphSW 226°
- Humidity: 37%
- Pressure: 29.91"Hg
- Visibility: 9mi
- UV index: 5
- details ▼
- 4 pm
- 81°F
- Feels like:81°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 9mphSW 235°
- Humidity: 41%
- Pressure: 29.88"Hg
- Visibility: 9mi
- UV index: 2
- details ▼
- 6 pm
- 79°F
- Feels like:79°F
Sunny
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 7mphWSW 241°
- Humidity: 49%
- Pressure: 29.88"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
Sunset: 6:14 pm
- 8 pm
- 75°F
- Feels like:75°F
Clear
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 3mphWSW 241°
- Humidity: 57%
- Pressure: 29.91"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 10 pm
- 72°F
- Feels like:72°F
Clear
- Precip. probability: 3%
- Precipitation: 0"
- Wind: 2mphS 190°
- Humidity: 63%
- Pressure: 29.91"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
Tomorrow, on Sunday, primarily sunny and occasionally cloudy weather is forecasted.
The temperature will vary between the lowest temperature of 68°F and the highest temperature of 82.4°F. The warmest part of the day will be from noon to 3 pm.
Tomorrow, the peak temperature is expected to align more with September than with October's typical high. The lowest temperature tomorrow will be comparable to October's average minimum.
The temperature will vary between the lowest temperature of 68°F and the highest temperature of 82.4°F. The warmest part of the day will be from noon to 3 pm.
Tomorrow, the peak temperature is expected to align more with September than with October's typical high. The lowest temperature tomorrow will be comparable to October's average minimum.
Updated: Oct 18, 2026 @ 05:13:56 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, in Costa Mesa, sun-filled conditions are expected to persist.
Tomorrow, the maximum temperature will be 82.4°F, while the minimum temperature will be 64.4°F. The maximum heat index, which combines air temperature and relative humidity, is evaluated at 82.4°F.
The maximum temperature tomorrow will be significantly higher than the average highest temperature of 73°F in October. The lowest temperature tomorrow will be in line with the average low temperature.
The maximum temperature tomorrow will be significantly higher than the average highest temperature of 73°F in October. The lowest temperature tomorrow 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.
