Weather forecast for todayCosta Mesa, CA

Weather forecast for today

Current condition 2:46 pm PDT

  • 88°F
  • Feels like:
    88°F
Partly Cloudy
Partly Cloudy
  • Precipitation: 0"
  • Wind: 6mphS 190°
  • Humidity: 22%
  • Dewpoint: 45°F
  • Pressure: 29.95"Hg
  • Visibility: 10mi
  • UV index: 4
  • ▼
At the moment, in Costa Mesa, a mix of cloud cover and clear skies can be seen.
The temperature is a hot 87.8°F. The current temperature is almost at the maximum of today's predicted 89.6°F.

Saturday Oct 17, 2026

  • 90°F
  • 68°F
Cloudy
Cloudy
  • Precip. probability: 3%
  • Precipitation: 0"
  • Wind: 7mphSW 231°
  • Humidity: 26%
  • UV index: 5
  • Sunrise: 6:58 am PDT
  • Sunset: 6:15 pm PDT
  • ▼
Today, in Costa Mesa, expect mostly gray skies with limited brightness.
The temperature will vary between a maximum of a tropical 89.6°F and a minimum of a delightful 68°F.
Today, the maximum temperature of 89.6°F will resemble September's climate more than October's.
Sunrise was at 6:58 am and sunset will be at 6:15 pm; the daylight will last for 11h and 17min.

Hourly overview

Hourly temperatures

Warmest hour: 3 pm 88°C.
Coldest hour: 11 pm 75°C.

Chance of precipitation

Highest chance: 5 pm 3%.

Hourly weather forecast

  • 3 pm
  • 88°F
  • Feels like:
    88°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 6mphSW 219°
  • Humidity: 23%
  • Pressure: 29.91"Hg
  • Visibility: 10mi
  • UV index: 3
  • ▼
  • 4 pm
  • 86°F
  • Feels like:
    86°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 7mphSW 225°
  • Humidity: 23%
  • Pressure: 29.91"Hg
  • Visibility: 10mi
  • UV index: 2
  • ▼
  • 5 pm
  • 84°F
  • Feels like:
    84°F
Cloudy
Cloudy
  • Precip. probability: 3%
  • Precipitation: 0"
  • Wind: 6mphWSW 238°
  • Humidity: 27%
  • Pressure: 29.91"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 6 pm
  • 82°F
  • Feels like:
    82°F
Cloudy
Cloudy
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 6mphWSW 237°
  • Humidity: 34%
  • Pressure: 29.91"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
Sunset: 6:15 pm
  • 7 pm
  • 81°F
  • Feels like:
    81°F
Cloudy
Cloudy
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 5mphWSW 250°
  • Humidity: 37%
  • Pressure: 29.94"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 8 pm
  • 79°F
  • Feels like:
    79°F
Mostly Cloudy
Mostly Cloudy
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 4mphSW 231°
  • Humidity: 40%
  • Pressure: 29.97"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 9 pm
  • 79°F
  • Feels like:
    79°F
Mostly Cloudy
Mostly Cloudy
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 2mphSW 232°
  • Humidity: 39%
  • Pressure: 29.97"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 10 pm
  • 77°F
  • Feels like:
    77°F
Mostly Cloudy
Mostly Cloudy
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 2mphS 190°
  • Humidity: 40%
  • Pressure: 29.97"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 11 pm
  • 75°F
  • Feels like:
    75°F
Mostly Cloudy
Mostly Cloudy
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 2mphSSE 153°
  • Humidity: 41%
  • Pressure: 29.97"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 12 am
  • 75°F
  • Feels like:
    75°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 2mphSSE 153°
  • Humidity: 41%
  • Pressure: 29.97"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 1 am
  • 73°F
  • Feels like:
    73°F
Mostly Clear
Mostly Clear
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 2mphESE 117°
  • Humidity: 44%
  • Pressure: 29.97"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
For the remainder of Saturday, expect mostly cloudy skies.
The temperature will be between a maximum of 87.8°F and a minimum of 75.2°F. The hottest part of the day will be around 3 pm.
The temperature will feel more consistent with September's average high than the expected maximum for October. Forecasts show a temperature also more close to September's average minimum of 64.2°F rather than the October average of 62.1°F.
Updated: Oct 17, 2026 @ 21:46:51 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate

Frequently asked questions

Currently (2:46 pm PDT) it is 87.8°F in Costa Mesa.

Today, in Costa Mesa, expect persistent cloudiness.

Today, the highest temperature will be 89.6°F, while the lowest temperature will be 68°F.
Today, the maximum temperature will be significantly higher than the average highest temperature of 73°F in October. Today, the lowest temperature will be a few degrees higher than the average low temperature.

On Saturday, in Costa Mesa, sunrise was at 6:58 am and sunset will be at 6:15 pm (PDT).

In Costa Mesa, today, there will be 11h and 17min of daylight.