Weather in Hercules, CA
Hercules, Friday, 9 October, 11:48
Clear. Feels like 68°. High 75°, low 57°.
Monthly outlook for Hercules, CA: average high 76°, average low 59.3°. That is 1° above the climate normal for October. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 2 days and 0.6 inches. The warmest day looks like 17 October (84.4°), the coolest 10 October (53.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 October – 18 October | 75° | 75.1° | -0.1° |
| 19 October – 28 October | 77.6° | 71.7° | +3.3° |
| 29 October – 7 November | at normal | 68.3° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Tara Hills (3 mi).
0Hercules, Saturday, 10 October
Clear. High 73°, low 53°.
0Hercules, Sunday, 11 October
Clear. High 70°, low 53°.
0Hercules, Monday, 12 October
Clear. High 67°, low 56°.
0
Hercules, Tuesday, 13 October
Mostly clear. High 71°, low 54°.
0Hercules, Wednesday, 14 October
Mostly clear. High 74°, low 56°.
0Hercules, Thursday, 15 October
Clear. High 79°, low 59°.
0Hercules, Friday, 16 October
Clear. High 83°, low 62°.
0Hercules, Saturday, 17 October
Clear. High 84°, low 65°.
0Hercules, Sunday, 18 October
Clear. High 72°, low 60°.
0Hercules, Monday, 19 October
Mostly clear. High 70°, low 58°.
0Hercules, Tuesday, 20 October
Clear. High 77°, low 60°.
0Hercules, Wednesday, 21 October
Clear. High 82°, low 62°.
0Hercules, Thursday, 22 October
Clear. High 83°, low 64°.
0Hercules, Friday, 23 October
Clear. High 83°, low 65°.
0
Hercules, Saturday, 24 October
Overcast. High 70°, low 64°.
0.07Hercules, Sunday, 25 October
Climate normal for this date — 60-year average.
0.05Hercules, Monday, 26 October
Climate normal for this date — 60-year average.
0.02Hercules, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.07Hercules, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.06
Hercules, Thursday, 29 October
Climate normal for this date — 60-year average.
0.06Hercules, Friday, 30 October
Climate normal for this date — 60-year average.
0.02Hercules, Saturday, 31 October
Climate normal for this date — 60-year average.
0.05Hercules, Sunday, 1 November
Climate normal for this date — 60-year average.
0.03Hercules, Monday, 2 November
Climate normal for this date — 60-year average.
0.03Hercules, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.02Hercules, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.05Hercules, Thursday, 5 November
Climate normal for this date — 60-year average.
0.06Hercules, Friday, 6 November
Climate normal for this date — 60-year average.
0.07Hercules, 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 Hercules, 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 Hercules, 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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