Weather in Fullerton, CA
Fullerton, Monday, 12 October, 11:05
Overcast. Feels like 63°. High 66°, low 58°.
Monthly outlook for Fullerton, CA: average high 81.3°, average low 65.5°. That is 1.6° above the climate normal for October. Precipitation is expected on 1 day (about 0.2 inches), against a normal of 1 days and 0.3 inches. The warmest day looks like 26 October (92.1°), the coolest 14 October (53.3°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 12 October – 21 October | 80° | 79° | +0.5° |
| 22 October – 31 October | 83.6° | 76.8° | +3.8° |
| 1 November – 10 November | at normal | 74.1° | — |
October records over 66 years
0
Fullerton, Tuesday, 13 October
Mostly clear. High 73°, low 54°.
0
Fullerton, Wednesday, 14 October
Clear. High 79°, low 53°.
0Fullerton, Thursday, 15 October
Clear. High 88°, low 59°.
0Fullerton, Friday, 16 October
Clear. High 92°, low 63°.
0Fullerton, Saturday, 17 October
Clear. High 91°, low 68°.
0Fullerton, Sunday, 18 October
Clear. High 86°, low 75°.
0Fullerton, Monday, 19 October
Clear. High 81°, low 71°.
0
Fullerton, Tuesday, 20 October
Partly cloudy. High 73°, low 66°.
0Fullerton, Wednesday, 21 October
Clear. High 71°, low 64°.
0.01
Fullerton, Thursday, 22 October
Light rain. High 72°, low 63°.
0Fullerton, Friday, 23 October
Clear. High 73°, low 65°.
0Fullerton, Saturday, 24 October
Clear. High 84°, low 67°.
0Fullerton, Sunday, 25 October
Clear. High 90°, low 71°.
0Fullerton, Monday, 26 October
Overcast. High 92°, low 75°.
0Fullerton, Tuesday, 27 October
Overcast. High 91°, low 76°.
0.01Fullerton, Wednesday, 28 October
Climate normal for this date — 60-year average.
0Fullerton, Thursday, 29 October
Climate normal for this date — 60-year average.
0.05Fullerton, Friday, 30 October
Climate normal for this date — 60-year average.
0.02Fullerton, Saturday, 31 October
Climate normal for this date — 60-year average.
0.03Fullerton, Sunday, 1 November
Climate normal for this date — 60-year average.
0.01Fullerton, Monday, 2 November
Climate normal for this date — 60-year average.
0Fullerton, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.02Fullerton, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.01Fullerton, Thursday, 5 November
Climate normal for this date — 60-year average.
0.02Fullerton, Friday, 6 November
Climate normal for this date — 60-year average.
0.07Fullerton, Saturday, 7 November
Climate normal for this date — 60-year average.
0.09Fullerton, Sunday, 8 November
Climate normal for this date — 60-year average.
0.04Fullerton, Monday, 9 November
Climate normal for this date — 60-year average.
0.03Fullerton, Tuesday, 10 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 Fullerton, 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 Fullerton, 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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