Weather in St. Helena, CA
St. Helena, Thursday, 29 October, 04:46
Overcast. Feels like 49°. High 69°, low 48°.
Monthly outlook for St. Helena, CA: average high 66.2°, average low 49°. That is 1.3° below the climate normal for October. Precipitation is expected on 2 days (about 1.0 inches), against a normal of 3 days and 1.5 inches. The warmest day looks like 3 November (73.4°), the coolest 1 November (39.3°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 29 October – 7 November | 67.6° | 70.2° | -1.5° |
| 8 November – 17 November | 63.9° | 65.2° | -0.7° |
| 18 November – 27 November | at normal | 62.1° | — |
October records over 66 years
0
St. Helena, Friday, 30 October
Partly cloudy. High 69°, low 43°.
0St. Helena, Saturday, 31 October
Overcast. High 63°, low 47°.
0
St. Helena, Sunday, 1 November
Clear. High 66°, low 39°.
0
St. Helena, Monday, 2 November
Mostly clear. High 73°, low 44°.
0St. Helena, Tuesday, 3 November
Overcast. High 73°, low 50°.
0St. Helena, Wednesday, 4 November
Overcast. High 68°, low 51°.
0.02
St. Helena, Thursday, 5 November
Light rain. High 63°, low 51°.
0.03St. Helena, Friday, 6 November
Light rain. High 62°, low 49°.
0St. Helena, Saturday, 7 November
Overcast. High 69°, low 46°.
0St. Helena, Sunday, 8 November
Overcast. High 67°, low 52°.
0.39St. Helena, Monday, 9 November
Rain. High 59°, low 53°.
0.02St. Helena, Tuesday, 10 November
Light rain. High 63°, low 59°.
0St. Helena, Wednesday, 11 November
Overcast. High 71°, low 57°.
0.53St. Helena, Thursday, 12 November
Rain. High 58°, low 48°.
0St. Helena, Friday, 13 November
Clear. High 66°, low 46°.
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.
0.09St. Helena, Tuesday, 24 November
Climate normal for this date — 60-year average.
0.06St. Helena, Wednesday, 25 November
Climate normal for this date — 60-year average.
0.07St. Helena, Thursday, 26 November
Climate normal for this date — 60-year average.
0.09St. Helena, Friday, 27 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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