Live Weather & Forecast
Weather in Costa Mesa
California, United States · Real-time conditions & 3-day outlook
16°C
Feels like 16°C
61°F / Feels 61°F
Overcast
Costa Mesa, California
🌙 Nighttime
Updated: 2026-04-12 05:00
Humidity
78%
Wind
16.9 km/h SSW
Wind Gust
23 km/h
Pressure
1014 mb
Visibility
16 km
UV Index
0
(Low)
Precipitation
0 mm
Cloud Cover
100%
Dew Point
8.9°C
Wind Degree
192°
Air Quality Index
US EPA: Good
UK DEFRA: Low (1)
CO
131.9 μg/m³
NO₂
5.6 μg/m³
O₃
86 μg/m³
SO₂
2.6 μg/m³
PM 2.5
6.6 μg/m³
PM 10
9.2 μg/m³
Today's Hourly Forecast
24-hour breakdown for Costa Mesa, California
12 AM
14°
Clear
1 AM
14°
Clear
2 AM
14°
Partly Cloudy
3 AM
14°
Cloudy
4 AM
14°
Cloudy
5 AM
16°
Overcast
6 AM
14°
Clear
7 AM
15°
Sunny
8 AM
16°
Sunny
9 AM
17°
Sunny
10 AM
16°
Patchy rain nearby
11 AM
15°
Light rain
12 PM
15°
Moderate rain
1 PM
17°
Moderate rain at times
2 PM
17°
Sunny
3 PM
17°
Cloudy
4 PM
17°
Cloudy
5 PM
17°
Sunny
6 PM
16°
Partly Cloudy
7 PM
16°
Partly Cloudy
8 PM
15°
Clear
9 PM
15°
Cloudy
10 PM
15°
Partly Cloudy
11 PM
14°
Partly Cloudy
3-Day Forecast
Daily overview for Costa Mesa, California
Today
Moderate rain
18°
/
14°
🌧️ 87% chance of rain
💧 Avg. humidity: 75%
💨 Max wind: 23.8 km/h
🌧️ Total precip: 6 mm
☀️ UV Index: 1.4
🌅 Sunrise: 06:24 AM
🌇 Sunset: 07:21 PM
🌙 Waning Crescent
🌑 Moon: 33% lit
Mon, Apr 13
Moderate rain
17°
/
13°
🌧️ 89% chance of rain
💧 Avg. humidity: 75%
💨 Max wind: 23.4 km/h
🌧️ Total precip: 11.98 mm
☀️ UV Index: 1.4
🌅 Sunrise: 06:23 AM
🌇 Sunset: 07:22 PM
🌙 Waning Crescent
🌑 Moon: 23% lit
Tue, Apr 14
Partly Cloudy
20°
/
13°
🌧️ 0% chance of rain
💧 Avg. humidity: 75%
💨 Max wind: 17.3 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.8
🌅 Sunrise: 06:22 AM
🌇 Sunset: 07:22 PM
🌙 Waning Crescent
🌑 Moon: 15% lit
Best Time to Visit Costa Mesa
Plan your trip to Costa Mesa, United States around the most favorable weather conditions.
Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
Frequently Asked Questions
What is the current weather in Costa Mesa?
Current conditions in Costa Mesa: Overcast, temperature 16°C, humidity 78%.
What is the best time to visit Costa Mesa?
The best time to visit Costa Mesa is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Costa Mesa?
Costa Mesa is located at approximately 33.7° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Costa Mesa?
The wettest period in Costa Mesa is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Costa Mesa?
For visits to Costa Mesa during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Costa Mesa in?
Costa Mesa is located in United States, in the state of California.
What are the public holidays in Costa Mesa in 2026?
View the 2026 public holidays for Costa Mesa on our Holidays page.
What are the GPS coordinates used for the weather forecast in Costa Mesa?
The weather forecast for Costa Mesa uses coordinates 33.6633, -117.9033.