Weather forecast for todayCosta Mesa, CA

Weather forecast for today

Current condition 4:23 am PDT

  • 63°F
  • Feels like:
    63°F
Fair
Fair
  • Precipitation: 0"
  • Wind: 1mphNNE 30°
  • Humidity: 93%
  • Dewpoint: 61°F
  • Pressure: 29.86"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
Currently, in Costa Mesa, the atmosphere is calm, with fair skies overhead.
The temperature is a breezy 62.6°F. The current temperature is almost at the minimum-predicted 64.4°F for today.

Wednesday Oct 21, 2026

  • 73°F
  • 64°F
PM Showers
PM Showers
  • Precip. probability: 59%
  • Precipitation: 0.67"
  • Wind: 9mphS 180°
  • Humidity: 77%
  • UV index: 4
  • Sunrise: 7:01 am PDT
  • Sunset: 6:10 pm PDT
  • ▼
Today, patchy afternoon showers could develop as the clouds thicken.
The likelihood of rainfall is high, and precipitation will be moderate. A slight fluctuation in temperature is expected, achieving a maximum of a temperate 73.4°F and dipping to a minimum of a comfortable 64.4°F.
The temperature will be in line with October's average maximum of 73°F.
Sunrise will be at 7:01 am and sunset at 6:10 pm; the daylight will last for 11h and 10min.

Hourly overview

Hourly temperatures

Warmest hour: 1 pm 73°C.
Coldest hour: 5 am 63°C.

Chance of precipitation

Highest chance: 7 pm 85%.

Hourly weather forecast

  • 6 am
  • 63°F
  • Feels like:
    63°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 2%
  • Precipitation: 0"
  • Wind: 1mphENE 69°
  • Humidity: 92%
  • Pressure: 29.83"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
Sunrise: 7:01 am
  • 8 am
  • 66°F
  • Feels like:
    66°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 2%
  • Precipitation: 0"
  • Wind: 4mphESE 112°
  • Humidity: 84%
  • Pressure: 29.83"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 10 am
  • 70°F
  • Feels like:
    70°F
Mostly Cloudy
Mostly Cloudy
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 6mphSSW 193°
  • Humidity: 75%
  • Pressure: 29.85"Hg
  • Visibility: 10mi
  • UV index: 3
  • ▼
  • 12 pm
  • 73°F
  • Feels like:
    73°F
Cloudy
Cloudy
  • Precip. probability: 24%
  • Precipitation: 0"
  • Wind: 9mphSW 226°
  • Humidity: 71%
  • Pressure: 29.85"Hg
  • Visibility: 10mi
  • UV index: 4
  • ▼
  • 2 pm
  • 72°F
  • Feels like:
    72°F
Cloudy
Cloudy
  • Precip. probability: 24%
  • Precipitation: 0"
  • Wind: 7mphSW 220°
  • Humidity: 68%
  • Pressure: 29.83"Hg
  • Visibility: 10mi
  • UV index: 2
  • ▼
  • 4 pm
  • 72°F
  • Feels like:
    72°F
Showers
Showers
  • Precip. probability: 38%
  • Precipitation: 0.04"
  • Wind: 6mphSSW 213°
  • Humidity: 64%
  • Pressure: 29.8"Hg
  • Visibility: 7mi
  • UV index: 1
  • ▼
  • 6 pm
  • 70°F
  • Feels like:
    70°F
Rain
Rain
  • Precip. probability: 60%
  • Precipitation: 0.08"
  • Wind: 5mphSSE 164°
  • Humidity: 70%
  • Pressure: 29.8"Hg
  • Visibility: 5mi
  • UV index: 0
  • ▼
Sunset: 6:10 pm
  • 8 pm
  • 68°F
  • Feels like:
    68°F
Rain
Rain
  • Precip. probability: 79%
  • Precipitation: 0.08"
  • Wind: 5mphSE 137°
  • Humidity: 79%
  • Pressure: 29.83"Hg
  • Visibility: 5mi
  • UV index: 0
  • ▼
  • 10 pm
  • 68°F
  • Feels like:
    68°F
Rain
Rain
  • Precip. probability: 73%
  • Precipitation: 0.12"
  • Wind: 5mphSSE 156°
  • Humidity: 81%
  • Pressure: 29.83"Hg
  • Visibility: 5mi
  • UV index: 0
  • ▼
Today, in Costa Mesa, a combination of damp and cloud-filled weather is expected.
Rainfall is expected at 1 pm, and from 3 pm to 11 pm. The most intense rain will be falling at 7 pm, 10 pm and 11 pm.
The temperature will vary between a minimum of 62.6°F and a maximum of 73.4°F. The warmest part of the day will be around noon.
The high temperature is expected to be alike with October's usual value of 73°F. The expected low will be also resembling the average minimum in October, which is 62.1°F.
Updated: Oct 21, 2026 @ 11:23:04 UTC
Published by: Weather Atlas | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate

Frequently asked questions

Currently (4:23 am PDT) it is 62.6°F in Costa Mesa.

Today, on-and-off showers may develop in the afternoon.

Moderate precipitation of 0.67" is expected. The chance of rainfall is 59%.

Today, the highest temperature will be 73.4°F, while the lowest temperature will be 64.4°F.
The maximum temperature will be in line with the average highest temperature of 73°F in October. The lowest temperature will be also in line with the average low of 62.1°F.

On Wednesday, in Costa Mesa, sunrise will be at 7:01 am and sunset at 6:10 pm (PDT).

In Costa Mesa, California, today, there will be 11h and 10min of daylight.