Weather in Costa Mesa, CA
Costa Mesa, Friday, 23 October, 15:15
Overcast. Feels like 71°. High 71°, low 60°.
Monthly outlook for Costa Mesa, CA: average high 74.2°, average low 63.5°. That is 1.3° above the climate normal for October. Precipitation is expected on 1 day (about 0.1 inches), against a normal of 1 days and 0.3 inches. The warmest day looks like 3 November (82.8°), the coolest 25 October (57.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 23 October – 1 November | 73.2° | 72.6° | +0.3° |
| 2 November – 11 November | 75.8° | 70.2° | +3.1° |
| 12 November – 21 November | at normal | 68.3° | — |
October records over 66 years
0
Costa Mesa, Saturday, 24 October
Clear. High 81°, low 58°.
0Costa Mesa, Sunday, 25 October
Clear. High 78°, low 57°.
0Costa Mesa, Monday, 26 October
Clear. High 79°, low 58°.
0Costa Mesa, Tuesday, 27 October
Clear. High 77°, low 58°.
0Costa Mesa, Wednesday, 28 October
Overcast. High 76°, low 58°.
0
Costa Mesa, Thursday, 29 October
Partly cloudy. High 69°, low 64°.
0.01
Costa Mesa, Friday, 30 October
Light rain. High 68°, low 66°.
0.03Costa Mesa, Saturday, 31 October
Light rain. High 65°, low 65°.
0Costa Mesa, Sunday, 1 November
Clear. High 68°, low 62°.
0Costa Mesa, Monday, 2 November
Clear. High 72°, low 63°.
0Costa Mesa, Tuesday, 3 November
Clear. High 83°, low 70°.
0Costa Mesa, Wednesday, 4 November
Partly cloudy. High 80°, low 71°.
0Costa Mesa, Thursday, 5 November
Clear. High 75°, low 70°.
0Costa Mesa, Friday, 6 November
Overcast. High 73°, low 70°.
0Costa Mesa, Saturday, 7 November
Clear. High 72°, low 68°.
0.07
Costa Mesa, Sunday, 8 November
Climate normal for this date — 60-year average.
0.04Costa Mesa, Monday, 9 November
Climate normal for this date — 60-year average.
0.03Costa Mesa, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.04Costa Mesa, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.04Costa Mesa, Thursday, 12 November
Climate normal for this date — 60-year average.
0.03Costa Mesa, Friday, 13 November
Climate normal for this date — 60-year average.
0.04Costa Mesa, Saturday, 14 November
Climate normal for this date — 60-year average.
0.06Costa Mesa, Sunday, 15 November
Climate normal for this date — 60-year average.
0.05Costa Mesa, Monday, 16 November
Climate normal for this date — 60-year average.
0.04Costa Mesa, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.04Costa Mesa, Wednesday, 18 November
Climate normal for this date — 60-year average.
0.06Costa Mesa, Thursday, 19 November
Climate normal for this date — 60-year average.
0.07Costa Mesa, Friday, 20 November
Climate normal for this date — 60-year average.
0.06Costa Mesa, Saturday, 21 November
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Costa Mesa, CA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Costa Mesa, CA since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
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