Weather in St. Helena, CA
St. Helena, Sunday, 25 October, 17:08
Overcast. Feels like 72°. High 73°, low 45°.
Monthly outlook for St. Helena, CA: average high 67.2°, average low 46.8°. That is 1.7° below the climate normal for October. Precipitation is expected on 3 days (about 1.7 inches), against a normal of 3 days and 1.2 inches. The warmest day looks like 9 November (77.5°), the coolest 27 October (40.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 25 October – 3 November | 67.2° | 71.7° | -2.5° |
| 4 November – 13 November | 67.4° | 67° | +0.2° |
| 14 November – 23 November | at normal | 63.2° | — |
October records over 66 years
0
St. Helena, Monday, 26 October
Clear. High 70°, low 41°.
0St. Helena, Tuesday, 27 October
Clear. High 67°, low 40°.
0St. Helena, Wednesday, 28 October
Clear. High 70°, low 43°.
0St. Helena, Thursday, 29 October
Overcast. High 69°, low 48°.
0St. Helena, Friday, 30 October
Clear. High 67°, low 43°.
0.01
St. Helena, Saturday, 31 October
Light rain. High 59°, low 42°.
0
St. Helena, Sunday, 1 November
Mostly clear. High 64°, low 44°.
0St. Helena, Monday, 2 November
Overcast. High 69°, low 46°.
0St. Helena, Tuesday, 3 November
Overcast. High 66°, low 48°.
1.43St. Helena, Wednesday, 4 November
Heavy rain. High 54°, low 47°.
0.24St. Helena, Thursday, 5 November
Rain. High 65°, low 51°.
0.06St. Helena, Friday, 6 November
Light rain. High 61°, low 52°.
0St. Helena, Saturday, 7 November
Mostly clear. High 71°, low 50°.
0St. Helena, Sunday, 8 November
Overcast. High 75°, low 52°.
0St. Helena, Monday, 9 November
Overcast. High 78°, low 55°.
0.19
St. Helena, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.13St. Helena, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.09St. Helena, Thursday, 12 November
Climate normal for this date — 60-year average.
0.19St. Helena, Friday, 13 November
Climate normal for this date — 60-year average.
0.07St. Helena, Saturday, 14 November
Climate normal for this date — 60-year average.
0.11St. Helena, Sunday, 15 November
Climate normal for this date — 60-year average.
0.15St. Helena, Monday, 16 November
Climate normal for this date — 60-year average.
0.15St. Helena, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.11St. Helena, Wednesday, 18 November
Climate normal for this date — 60-year average.
0.12St. Helena, Thursday, 19 November
Climate normal for this date — 60-year average.
0.15
St. Helena, Friday, 20 November
Climate normal for this date — 60-year average.
0.18St. Helena, Saturday, 21 November
Climate normal for this date — 60-year average.
0.15St. Helena, Sunday, 22 November
Climate normal for this date — 60-year average.
0.11St. Helena, Monday, 23 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 St. Helena, 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 St. Helena, 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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