Weather in Costa Mesa, CA
Costa Mesa, Thursday, 29 October, 17:55
Overcast. Feels like 70°. High 75°, low 63°.
Monthly outlook for Costa Mesa, CA: average high 70.3°, average low 63°. That is 0.1° below the climate normal for October. Precipitation is expected on 4 days (about 1.0 inches), against a normal of 1 days and 0.5 inches. The warmest day looks like 29 October (74.9°), the coolest 3 November (57°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 29 October – 7 November | 71.2° | 71.2° | +0° |
| 8 November – 17 November | 68.8° | 69° | -0.1° |
| 18 November – 27 November | at normal | 67.2° | — |
October records over 66 years
0.01
Costa Mesa, Friday, 30 October
Light rain. High 72°, low 63°.
0.29Costa Mesa, Saturday, 31 October
Rain. High 68°, low 60°.
0.37Costa Mesa, Sunday, 1 November
Rain. High 70°, low 62°.
0
Costa Mesa, Monday, 2 November
Clear. High 72°, low 60°.
0Costa Mesa, Tuesday, 3 November
Clear. High 73°, low 57°.
0
Costa Mesa, Wednesday, 4 November
Partly cloudy. High 68°, low 63°.
0.02Costa Mesa, Thursday, 5 November
Light rain. High 70°, low 66°.
0Costa Mesa, Friday, 6 November
Overcast. High 71°, low 66°.
0Costa Mesa, Saturday, 7 November
Clear. High 73°, low 66°.
0Costa Mesa, Sunday, 8 November
Clear. High 73°, low 67°.
0Costa Mesa, Monday, 9 November
Overcast. High 71°, low 67°.
0.26Costa Mesa, Tuesday, 10 November
Rain. High 68°, low 66°.
0
Costa Mesa, Wednesday, 11 November
Mostly clear. High 68°, low 64°.
0.07Costa Mesa, Thursday, 12 November
Light rain. High 65°, low 62°.
0Costa Mesa, Friday, 13 November
Clear. High 68°, low 58°.
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.
0.04Costa Mesa, Sunday, 22 November
Climate normal for this date — 60-year average.
0.01Costa Mesa, Monday, 23 November
Climate normal for this date — 60-year average.
0.03Costa Mesa, Tuesday, 24 November
Climate normal for this date — 60-year average.
0.05Costa Mesa, Wednesday, 25 November
Climate normal for this date — 60-year average.
0.06Costa Mesa, Thursday, 26 November
Climate normal for this date — 60-year average.
0.03Costa Mesa, Friday, 27 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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