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Current weather in Costa Mesa is few clouds.

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Weather data for Costa Mesa is updated regularly with the latest available observations and forecasts.

Now · 5:26 PM

Costa Mesa Weather & Hourly Forecast

United States · California · 92626

80°F

Mostly sunny

Feels like: 78°F

💧 Humidity 43% 🌡 Pressure 29.88 inHg 💨 Wind 6 mph 👁 Visibility 25.2 mi ☁ Clouds 20% ☀️ UV index 1.7 · Low 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Costa Mesa

Today

6:00 PM

Sunny

79° 💧 None 💨 4 mph H 46%29.88 inHg

9:00 PM

Clear night

75° 💧 None 💨 2 mph H 64%29.91 inHg

Tomorrow

12:00 AM

Clear night

73° 💧 None 💨 2 mph H 70%29.91 inHg

3:00 AM

Overcast night

73° 💧 0.030 in 💨 2 mph H 68%29.88 inHg

6:00 AM

Light rain

70° 💧 0.052 in 💨 4 mph H 84%29.91 inHg

9:00 AM

Light rain

72° 💧 0.198 in 💨 1 mph H 90%29.94 inHg

12:00 PM

Light rain

75° 💧 0.157 in 💨 3 mph H 82%29.94 inHg

3:00 PM

Light rain

76° 💧 0.066 in 💨 4 mph H 81%29.88 inHg

6:00 PM

Overcast

76° 💧 None 💨 4 mph H 86%29.83 inHg

9:00 PM

Mostly cloudy night

74° 💧 0.008 in 💨 4 mph H 87%29.88 inHg

Monday

12:00 AM

Mostly clear night

72° 💧 None 💨 3 mph H 92%29.88 inHg

3:00 AM

Clear night

70° 💧 None 💨 2 mph H 95%29.85 inHg

6:00 AM

Mostly clear night

69° 💧 None 💨 2 mph H 97%29.85 inHg

9:00 AM

Mostly sunny

75° 💧 None 💨 2 mph H 88%29.88 inHg

12:00 PM

Mostly sunny

85° 💧 None 💨 3 mph H 66%29.88 inHg

3:00 PM

Mostly cloudy

85° 💧 None 💨 5 mph H 64%29.85 inHg

Today

6:00 PM

Sunny

79° 💧 None 💨 4 mph H 46%29.88 inHg

7:00 PM

Sunny

77° 💧 None 💨 4 mph H 54%29.88 inHg

8:00 PM

Clear night

75° 💧 None 💨 3 mph H 63%29.88 inHg

9:00 PM

Clear night

75° 💧 None 💨 2 mph H 64%29.91 inHg

10:00 PM

Clear night

75° 💧 None 💨 2 mph H 65%29.91 inHg

11:00 PM

Clear night

74° 💧 None 💨 2 mph H 68%29.91 inHg

Tomorrow

12:00 AM

Clear night

73° 💧 None 💨 2 mph H 70%29.91 inHg

1:00 AM

Overcast night

73° 💧 None 💨 2 mph H 70%29.91 inHg

2:00 AM

Overcast night

73° 💧 None 💨 1 mph H 70%29.88 inHg

3:00 AM

Overcast night

73° 💧 None 💨 2 mph H 68%29.88 inHg

4:00 AM

Overcast night

73° 💧 None 💨 2 mph H 65%29.88 inHg

5:00 AM

Light rain

71° 💧 0.030 in 💨 2 mph H 72%29.91 inHg

6:00 AM

Light rain

70° 💧 0.033 in 💨 4 mph H 84%29.91 inHg

7:00 AM

Mostly cloudy

70° 💧 None 💨 4 mph H 84%29.91 inHg

8:00 AM

Light rain

72° 💧 0.019 in 💨 2 mph H 84%29.94 inHg

9:00 AM

Light rain

72° 💧 0.080 in 💨 1 mph H 90%29.94 inHg

10:00 AM

Light rain

73° 💧 0.040 in 💨 1 mph H 89%29.94 inHg

11:00 AM

Light rain

73° 💧 0.077 in 💨 2 mph H 92%29.94 inHg

12:00 PM

Light rain

75° 💧 0.050 in 💨 3 mph H 82%29.94 inHg

1:00 PM

Light rain

74° 💧 0.070 in 💨 2 mph H 84%29.94 inHg

2:00 PM

Light rain

76° 💧 0.038 in 💨 3 mph H 81%29.91 inHg

3:00 PM

Light rain

76° 💧 0.031 in 💨 4 mph H 81%29.88 inHg

4:00 PM

Light rain

76° 💧 0.031 in 💨 5 mph H 85%29.85 inHg

5:00 PM

Light rain

76° 💧 0.004 in 💨 4 mph H 87%29.85 inHg

6:00 PM

Overcast

76° 💧 None 💨 4 mph H 86%29.83 inHg

7:00 PM

Mostly cloudy

76° 💧 None 💨 4 mph H 86%29.83 inHg

8:00 PM

Overcast night

75° 💧 None 💨 4 mph H 86%29.85 inHg

9:00 PM

Mostly cloudy night

74° 💧 None 💨 4 mph H 87%29.88 inHg

10:00 PM

Light rain

73° 💧 0.004 in 💨 4 mph H 90%29.88 inHg

11:00 PM

Partly cloudy night

72° 💧 0.004 in 💨 3 mph H 91%29.88 inHg

Monday

12:00 AM

Mostly clear night

72° 💧 None 💨 3 mph H 92%29.88 inHg

1:00 AM

Clear night

71° 💧 None 💨 3 mph H 94%29.88 inHg

2:00 AM

Clear night

70° 💧 None 💨 3 mph H 95%29.88 inHg

3:00 AM

Clear night

70° 💧 None 💨 2 mph H 95%29.85 inHg

4:00 AM

Clear night

69° 💧 None 💨 2 mph H 95%29.85 inHg

5:00 AM

Mostly clear night

69° 💧 None 💨 2 mph H 96%29.85 inHg

6:00 AM

Mostly clear night

69° 💧 None 💨 2 mph H 97%29.85 inHg

7:00 AM

Mostly sunny

69° 💧 None 💨 2 mph H 98%29.88 inHg

8:00 AM

Mostly sunny

71° 💧 None 💨 2 mph H 94%29.88 inHg

9:00 AM

Mostly sunny

75° 💧 None 💨 2 mph H 88%29.88 inHg

10:00 AM

Mostly sunny

79° 💧 None 💨 3 mph H 78%29.88 inHg

11:00 AM

Sunny

83° 💧 None 💨 3 mph H 70%29.91 inHg

12:00 PM

Mostly sunny

85° 💧 None 💨 3 mph H 66%29.88 inHg

1:00 PM

Partly cloudy

86° 💧 None 💨 4 mph H 66%29.88 inHg

2:00 PM

Partly cloudy

85° 💧 None 💨 5 mph H 66%29.85 inHg

3:00 PM

Mostly cloudy

85° 💧 None 💨 5 mph H 64%29.85 inHg

4:00 PM

Mostly cloudy

84° 💧 None 💨 6 mph H 61%29.83 inHg

5:00 PM

Overcast

83° 💧 None 💨 5 mph H 60%29.83 inHg

6:00 PM

Overcast

80° 💧 None 💨 4 mph H 63%29.83 inHg

7:00 PM

Mostly cloudy

78° 💧 None 💨 3 mph H 66%29.83 inHg

8:00 PM

Partly cloudy night

76° 💧 None 💨 2 mph H 69%29.85 inHg

9:00 PM

Clear night

74° 💧 None 💨 1 mph H 72%29.85 inHg

10:00 PM

Clear night

73° 💧 None 💨 1 mph H 75%29.88 inHg

11:00 PM

Clear night

72° 💧 None 💨 1 mph H 77%29.88 inHg

Tuesday

12:00 AM

Clear night

71° 💧 None 💨 1 mph H 79%29.88 inHg

1:00 AM

Mostly clear night

71° 💧 None 💨 1 mph H 79%29.88 inHg

2:00 AM

Mostly cloudy night

70° 💧 None 💨 1 mph H 78%29.88 inHg

3:00 AM

Mostly cloudy night

70° 💧 None 💨 1 mph H 78%29.88 inHg

4:00 AM

Mostly cloudy night

69° 💧 None 💨 0 mph H 79%29.88 inHg

5:00 AM

Partly cloudy night

69° 💧 None 💨 1 mph H 76%29.88 inHg

8:00 AM

Partly cloudy

72° 💧 None 💨 2 mph H 82%29.91 inHg

11:00 AM

Mostly sunny

80° 💧 None 💨 2 mph H 62%29.91 inHg

2:00 PM

Mostly sunny

84° 💧 None 💨 6 mph H 57%29.85 inHg

5:00 PM

Mostly sunny

85° 💧 None 💨 6 mph H 46%29.83 inHg

8:00 PM

Mostly clear night

78° 💧 None 💨 2 mph H 58%29.85 inHg

11:00 PM

Overcast night

74° 💧 None 💨 2 mph H 71%29.91 inHg

Wednesday

2:00 AM

Mostly cloudy night

73° 💧 None 💨 3 mph H 81%29.91 inHg

5:00 AM

Clear night

72° 💧 None 💨 3 mph H 85%29.88 inHg

8:00 AM

Sunny

74° 💧 None 💨 2 mph H 80%29.94 inHg

11:00 AM

Sunny

85° 💧 None 💨 2 mph H 54%29.94 inHg

2:00 PM

Sunny

88° 💧 None 💨 7 mph H 44%29.91 inHg

5:00 PM

Sunny

90° 💧 None 💨 7 mph H 42%29.85 inHg

8:00 PM

Clear night

84° 💧 None 💨 3 mph H 46%29.88 inHg

11:00 PM

Clear night

78° 💧 None 💨 4 mph H 66%29.94 inHg

Thursday

2:00 AM

Mostly clear night

75° 💧 None 💨 3 mph H 75%29.94 inHg

5:00 AM

Clear night

73° 💧 None 💨 3 mph H 82%29.91 inHg

8:00 AM

Sunny

75° 💧 None 💨 2 mph H 77%29.94 inHg

11:00 AM

Sunny

83° 💧 None 💨 5 mph H 60%29.94 inHg

2:00 PM

Sunny

84° 💧 None 💨 8 mph H 54%29.88 inHg

5:00 PM

Sunny

84° 💧 None 💨 7 mph H 58%29.83 inHg

8:00 PM

Clear night

78° 💧 None 💨 4 mph H 71%29.85 inHg

11:00 PM

Clear night

75° 💧 None 💨 5 mph H 76%29.88 inHg

Friday

2:00 AM

Clear night

73° 💧 None 💨 4 mph H 78%29.85 inHg

5:00 AM

Clear night

72° 💧 None 💨 3 mph H 82%29.85 inHg

11:00 AM

Sunny

82° 💧 None 💨 6 mph H 55%29.88 inHg

5:00 PM

Mostly sunny

78° 💧 None 💨 7 mph H 68%29.80 inHg

11:00 PM

Clear night

72° 💧 None 💨 4 mph H 87%29.83 inHg

Saturday

5:00 AM

Partly cloudy night

70° 💧 None 💨 6 mph H 91%29.83 inHg

11:00 AM

Sunny

78° 💧 None 💨 4 mph H 66%29.85 inHg

5:00 PM

Mostly sunny

78° 💧 None 💨 7 mph H 69%29.77 inHg

11:00 PM

Clear night

72° 💧 None 💨 3 mph H 84%29.80 inHg

Sunday

5:00 AM

Overcast night

69° 💧 None 💨 3 mph H 96%29.80 inHg

11:00 AM

Mostly sunny

78° 💧 None 💨 4 mph H 67%29.85 inHg

5:00 PM

Sunny

83° 💧 None 💨 7 mph H 59%29.77 inHg

11:00 PM

Clear night

73° 💧 None 💨 5 mph H 79%29.85 inHg

Monday

5:00 AM

Clear night

69° 💧 None 💨 3 mph H 91%29.85 inHg

11:00 AM

Sunny

78° 💧 None 💨 6 mph H 67%29.88 inHg

5:00 PM

Sunny

77° 💧 None 💨 7 mph H 60%29.83 inHg

11:00 PM

Clear night

71° 💧 None 💨 3 mph H 82%29.88 inHg

Tuesday

5:00 AM

Mostly clear night

67° 💧 None 💨 3 mph H 94%29.88 inHg

11:00 AM

Mostly sunny

77° 💧 None 💨 3 mph H 68%29.91 inHg

5:00 PM

Mostly sunny

78° 💧 None 💨 7 mph H 62%29.83 inHg

11:00 PM

Clear night

72° 💧 None 💨 3 mph H 84%29.91 inHg

Wednesday

5:00 AM

Clear night

68° 💧 None 💨 2 mph H 91%29.91 inHg

11:00 AM

Mostly sunny

78° 💧 None 💨 4 mph H 63%29.97 inHg

5:00 PM

Mostly sunny

78° 💧 None 💨 7 mph H 64%29.91 inHg

11:00 PM

Mostly clear night

72° 💧 None 💨 2 mph H 83%30.00 inHg

Thursday

5:00 AM

Partly cloudy night

69° 💧 None 💨 1 mph H 89%29.97 inHg

11:00 AM

Overcast

81° 💧 None 💨 3 mph H 56%30.00 inHg

5:00 PM

Mostly sunny

83° 💧 None 💨 7 mph H 53%29.91 inHg

11:00 PM

Clear night

74° 💧 None 💨 3 mph H 85%29.97 inHg

Friday

5:00 AM

Clear night

72° 💧 None 💨 2 mph H 88%29.94 inHg

11:00 AM

Sunny

83° 💧 None 💨 5 mph H 49%29.94 inHg

5:00 PM

Sunny

84° 💧 None 💨 6 mph H 48%29.83 inHg

11:00 PM

Clear night

75° 💧 None 💨 3 mph H 87%29.88 inHg

Saturday

5:00 AM

Clear night

71° 💧 None 💨 1 mph H 91%29.85 inHg

11:00 AM

Sunny

82° 💧 None 💨 4 mph H 52%29.85 inHg

5:00 PM

Mostly sunny

80° 💧 None 💨 6 mph H 64%29.77 inHg

11:00 PM

Clear night

74° 💧 None 💨 3 mph H 78%29.85 inHg

Sunday

5:00 AM

Overcast night

71° 💧 None 💨 3 mph H 91%29.85 inHg

In Costa Mesa and, more broadly, across the state of California: Clear skies will persist into the evening, with temperatures gradually cooling from the day's high to the mid-70s. Expect conditions to remain dry, with no precipitation in the forecast. Winds will be moderate from the west, averaging around 10 to 14 mph, with gusts reaching up to 30 mph. As the night approaches, temperatures will cool into the low 70s, providing a comfortable evening. Overall, it will be a warm and breezy evening with clear conditions lasting into the night.

15-Day Weather Outlook for Costa Mesa

Monday, Sep 7Mon Sep 7

Overcast 86°/69° 💧 None 💨 6 mph

Tuesday, Sep 8Tue Sep 8

Overcast 84°/69° 💧 0.471 in 💨 6 mph

Wednesday, Sep 9Wed Sep 9

Mostly cloudy 88°/72° 💧 0.009 in 💨 7 mph

Thursday, Sep 10Thu Sep 10

Mostly sunny 90°/73° 💧 None 💨 8 mph

Friday, Sep 11Fri Sep 11

Sunny 84°/72° 💧 None 💨 7 mph

Saturday, Sep 12Sat Sep 12

Mostly sunny 78°/70° 💧 0.001 in 💨 7 mph

Sunday, Sep 13Sun Sep 13

Overcast 78°/69° 💧 None 💨 7 mph

Monday, Sep 14Mon Sep 14

Sunny 83°/69° 💧 0.001 in 💨 7 mph

Tuesday, Sep 15Tue Sep 15

Mostly sunny 77°/67° 💧 None 💨 7 mph

Wednesday, Sep 16Wed Sep 16

Mostly sunny 78°/68° 💧 None 💨 7 mph

Thursday, Sep 17Thu Sep 17

Mostly sunny 81°/69° 💧 None 💨 7 mph

Friday, Sep 18Fri Sep 18

Mostly sunny 83°/72° 💧 None 💨 7 mph

Saturday, Sep 19Sat Sep 19

Sunny 84°/71° 💧 0.001 in 💨 6 mph

Sunday, Sep 20Sun Sep 20

Mostly sunny 80°/71° 💧 None 💨 6 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Costa Mesa

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Costa Mesa

Hourly forecast · Updated every 2 hours

Fair

Nearest forecast value 6:00 PM

PM2.5 Fine particles Good 4,0µg/m³

Microscopic particles that can penetrate deep into the lungs. Elevated concentrations can especially affect children, older adults and people with respiratory conditions.

PM10 Particulate matter Good 8,9µg/m³

Includes dust, pollen and other airborne particles. High concentrations may irritate the respiratory system.

O₃ Ozone Fair 83,8µg/m³

Ground-level ozone can irritate the eyes and respiratory system when concentrations are elevated.

NO₂ Nitrogen dioxide Good 0,3µg/m³

A gas emitted mainly by traffic and some industrial activity. High exposure can affect respiratory health.

Air quality is acceptable for most people.

UV & HEALTH

UV, Sun & Health Outlook in Costa Mesa

Maximum daily UV Today, tomorrow and the following day show the maximum UV index forecast for each day.

0–2 Low 3–5 Moderate 6–7 High 8–10 Very high 11+ Extreme

Today UV 9,5Very high 🙂Fair

Tomorrow UV 1,8Low 🙂Fair

Monday UV 9,3Very high 🙂Fair

Tuesday UV 9,5Very high 😐Moderate

Wednesday UV 8,8Very high 🙂Fair

Thursday UV 7,0High —Unavailable

Friday UV 7,0High —Unavailable

Hourly UV index today

6:00 PMUV 0,5 7:00 PMUV 0,0

Today's weather health advice Open today's recommendations.

Very high UV risk

Use SPF 50+ sunscreen, a hat and sunglasses. Seek shade and limit exposure around midday.

Acceptable air quality

Air quality is acceptable for most people. Very sensitive people may want to reduce prolonged exertion.

Stay hydrated

Drink water regularly, especially during physical activity or prolonged sun exposure.

Best in the morning or late in the day

For walking, running or cycling, prefer the early morning or late afternoon.

WIND OUTLOOK

Hourly Wind Forecast for Costa Mesa

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · COSTA MESA, CALIFORNIA

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 9:00 PM–10:00 PM.

99/100Best-hour score

BEST TIME TONIGHT 9:00 PM–10:00 PM Astronomical darkness: 8:37 PM–5:03 AM

☁ Cloud cover 2% Real hourly forecast for the best viewing hour.

☾ Moonlight 32% Last Quarter · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 2° high at the best hour.

✦ Estimated visible meteors 0–1/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min8%

UPCOMING METEOR PERIODSStart, peak and end dates · weather should be checked closer to the peak.

AUG 28–SEP 5

AurigidsStart AUG 28 · Peak SEP 1 · End SEP 5 · ZHR 6 · 80% Moon at peak

ACTIVE NOW

SEP 5–SEP 21

September ε-PerseidsStart SEP 5 · Peak SEP 9 · End SEP 21 · ZHR 8 · 6% Moon at peak

ACTIVE NOW

SEP 20–NOV 20

Southern TauridsStart SEP 20 · Peak NOV 5 · End NOV 20 · ZHR 7 · 20% Moon at peak

UPCOMING

OCT 2–NOV 7

OrionidsStart OCT 2 · Peak OCT 21 · End NOV 7 · ZHR 20 · 77% Moon at peak

UPCOMING

Experimental local observing estimate. Weather values come from the hourly forecast already used on this page. Moon position and astronomical darkness are calculated locally from time and coordinates. Meteor-shower ZHR describes ideal conditions and is not the number of meteors a person should expect to see locally.

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Forecast data for Costa Mesa were last refreshed today at 5:16 PM. The current forecast period extends through 07/09/2026 at 3:00 PM. Weather, air-quality and UV-index data are provided through WEATHER-INFO.COM. Forecasts are produced automatically from the latest available data and are subject to periodic technical checks. This service is intended for general weather information.