Weather in Fullerton, CA
Fullerton, Friday, 9 October, 03:41
Clear. Feels like 70°. High 90°, low 68°.
Monthly outlook for Fullerton, CA: average high 79.8°, average low 66.2°. That is 0.3° above the climate normal for October. Precipitation is expected on 2 days (about 0.7 inches), against a normal of 1 days and 0.3 inches. The warmest day looks like 17 October (94.9°), the coolest 13 October (52.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 October – 18 October | 82.5° | 79.6° | +1.6° |
| 19 October – 28 October | 75.2° | 77.7° | -1.4° |
| 29 October – 7 November | at normal | 74.9° | — |
October records over 66 years
0
Fullerton, Saturday, 10 October
Light rain. High 85°, low 65°.
0.6Fullerton, Sunday, 11 October
Rain. High 73°, low 61°.
0.12Fullerton, Monday, 12 October
Light rain. High 67°, low 56°.
0
Fullerton, Tuesday, 13 October
Clear. High 70°, low 53°.
0Fullerton, Wednesday, 14 October
Clear. High 78°, low 54°.
0Fullerton, Thursday, 15 October
Clear. High 83°, low 68°.
0Fullerton, Friday, 16 October
Clear. High 93°, low 75°.
0Fullerton, Saturday, 17 October
Clear. High 95°, low 77°.
0Fullerton, Sunday, 18 October
Clear. High 92°, low 79°.
0Fullerton, Monday, 19 October
Clear. High 87°, low 76°.
0Fullerton, Tuesday, 20 October
Clear. High 78°, low 69°.
0
Fullerton, Wednesday, 21 October
Partly cloudy. High 71°, low 65°.
0Fullerton, Thursday, 22 October
Partly cloudy. High 71°, low 64°.
0.01Fullerton, Friday, 23 October
Light rain. High 72°, low 65°.
0
Fullerton, Saturday, 24 October
Overcast. High 72°, low 64°.
0.02
Fullerton, Sunday, 25 October
Climate normal for this date — 60-year average.
0.01Fullerton, Monday, 26 October
Climate normal for this date — 60-year average.
0.05Fullerton, Tuesday, 27 October
Climate normal for this date — 60-year average.
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.
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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