Weather in St. Helena, CA
St. Helena, Saturday, 24 October, 03:57
Clear. Feels like 49°. High 76°, low 48°.
Monthly outlook for St. Helena, CA: average high 70.6°, average low 50.5°. That is 0.1° below the climate normal for October. Precipitation is expected on 1 day (about 0.6 inches), against a normal of 3 days and 1.3 inches. The warmest day looks like 3 November (75.7°), the coolest 26 October (43.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 24 October – 2 November | 69.8° | 72° | -1.2° |
| 3 November – 12 November | 71.9° | 67.6° | +2.4° |
| 13 November – 22 November | at normal | 63.4° | — |
October records over 66 years
0
St. Helena, Sunday, 25 October
Partly cloudy. High 69°, low 46°.
0
St. Helena, Monday, 26 October
Clear. High 67°, low 43°.
0
St. Helena, Tuesday, 27 October
Mostly clear. High 68°, low 44°.
0
St. Helena, Wednesday, 28 October
Overcast. High 68°, low 44°.
0St. Helena, Thursday, 29 October
Overcast. High 64°, low 48°.
0St. Helena, Friday, 30 October
Mostly clear. High 70°, low 47°.
0St. Helena, Saturday, 31 October
Overcast. High 70°, low 48°.
0St. Helena, Sunday, 1 November
Overcast. High 72°, low 55°.
0St. Helena, Monday, 2 November
Partly cloudy. High 74°, low 57°.
0St. Helena, Tuesday, 3 November
Overcast. High 76°, low 56°.
0St. Helena, Wednesday, 4 November
Overcast. High 75°, low 55°.
0St. Helena, Thursday, 5 November
Overcast. High 74°, low 55°.
0.63
St. Helena, Friday, 6 November
Rain. High 64°, low 55°.
0St. Helena, Saturday, 7 November
Overcast. High 68°, low 52°.
0St. Helena, Sunday, 8 November
Partly cloudy. High 75°, low 54°.
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.
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.
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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