Weather in Costa Mesa, CA
Costa Mesa, Saturday, 31 October, 14:07
Overcast. Feels like 73°. High 73°, low 60°.
Monthly outlook for Costa Mesa, CA: average high 72.6°, average low 61.5°. That is 1.3° above the climate normal for October. Precipitation is expected on 4 days (about 1.3 inches), against a normal of 1 days and 0.5 inches. The warmest day looks like 7 November (80.8°), the coolest 2 November (52.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 31 October – 9 November | 74.3° | 70.7° | +2° |
| 10 November – 19 November | 69.6° | 68.7° | +0.5° |
| 20 November – 29 November | at normal | 66.8° | — |
October records over 66 years
0.38
Costa Mesa, Sunday, 1 November
Rain. High 70°, low 55°.
0
Costa Mesa, Monday, 2 November
Clear. High 71°, low 52°.
0Costa Mesa, Tuesday, 3 November
Clear. High 73°, low 54°.
0Costa Mesa, Wednesday, 4 November
Clear. High 71°, low 57°.
0
Costa Mesa, Thursday, 5 November
Mostly clear. High 75°, low 55°.
0Costa Mesa, Friday, 6 November
Clear. High 78°, low 62°.
0Costa Mesa, Saturday, 7 November
Clear. High 81°, low 71°.
0Costa Mesa, Sunday, 8 November
Overcast. High 77°, low 71°.
0Costa Mesa, Monday, 9 November
Overcast. High 74°, low 70°.
0Costa Mesa, Tuesday, 10 November
Overcast. High 72°, low 68°.
0.47Costa Mesa, Wednesday, 11 November
Rain. High 67°, low 63°.
0.32Costa Mesa, Thursday, 12 November
Rain. High 67°, low 57°.
0Costa Mesa, Friday, 13 November
Clear. High 68°, low 60°.
0Costa Mesa, Saturday, 14 November
Clear. High 73°, low 63°.
0Costa Mesa, Sunday, 15 November
Overcast. High 71°, low 66°.
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.
0.07Costa Mesa, Saturday, 28 November
Climate normal for this date — 60-year average.
0.09Costa Mesa, Sunday, 29 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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