Weather in St. Helena, CA
St. Helena, Thursday, 22 October, 08:35
Overcast. Feels like 55°. High 62°, low 51°.
Monthly outlook for St. Helena, CA: average high 71.7°, average low 48.7°. That is 0° below the climate normal for October. Precipitation is expected on 1 day (about 0.1 inches), against a normal of 3 days and 1.2 inches. The warmest day looks like 2 November (79.7°), the coolest 30 October (42.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 22 October – 31 October | 70.1° | 72.7° | -1.4° |
| 1 November – 10 November | 74.5° | 68.7° | +3.2° |
| 11 November – 20 November | at normal | 64.2° | — |
October records over 66 years
0
St. Helena, Friday, 23 October
Clear. High 71°, low 45°.
0St. Helena, Saturday, 24 October
Clear. High 76°, low 51°.
0
St. Helena, Sunday, 25 October
Partly cloudy. High 74°, low 48°.
0St. Helena, Monday, 26 October
Clear. High 68°, low 48°.
0St. Helena, Tuesday, 27 October
Clear. High 68°, low 43°.
0St. Helena, Wednesday, 28 October
Overcast. High 74°, low 50°.
0St. Helena, Thursday, 29 October
Overcast. High 69°, low 46°.
0
St. Helena, Friday, 30 October
Mostly clear. High 66°, low 42°.
0St. Helena, Saturday, 31 October
Overcast. High 73°, low 47°.
0St. Helena, Sunday, 1 November
Clear. High 77°, low 48°.
0St. Helena, Monday, 2 November
Partly cloudy. High 80°, low 52°.
0St. Helena, Tuesday, 3 November
Mostly clear. High 79°, low 54°.
0St. Helena, Wednesday, 4 November
Overcast. High 75°, low 54°.
0St. Helena, Thursday, 5 November
Overcast. High 71°, low 50°.
0.01
St. Helena, Friday, 6 November
Light rain. High 65°, low 50°.
0.12St. Helena, Saturday, 7 November
Climate normal for this date — 60-year average.
0.09St. Helena, Sunday, 8 November
Climate normal for this date — 60-year average.
0.12St. Helena, Monday, 9 November
Climate normal for this date — 60-year average.
0.19St. 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.
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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