Weather in St. Helena, CA
St. Helena, Sunday, 8 November, 07:59
Overcast. Feels like 55°. High 73°, low 49°.
Monthly outlook for St. Helena, CA: average high 65.4°, average low 47.2°. That is 0.7° above the climate normal for November. Precipitation is expected on 3 days (about 2.3 inches), against a normal of 4 days and 2.1 inches. The warmest day looks like 14 November (77.5°), the coolest 17 November (41.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 November – 17 November | 69.4° | 65.2° | +2.3° |
| 18 November – 27 November | 58.7° | 62.1° | -1.9° |
| 28 November – 7 December | at normal | 60° | — |
November records over 66 years
0St. Helena, Monday, 9 November
Overcast. High 75°, low 44°.
0
St. Helena, Tuesday, 10 November
Clear. High 77°, low 49°.
0
St. Helena, Wednesday, 11 November
Partly cloudy. High 74°, low 49°.
0St. Helena, Thursday, 12 November
Overcast. High 68°, low 50°.
0St. Helena, Friday, 13 November
Clear. High 72°, low 49°.
0
St. Helena, Saturday, 14 November
Mostly clear. High 77°, low 54°.
0.66
St. Helena, Sunday, 15 November
Rain. High 57°, low 50°.
0St. Helena, Monday, 16 November
Partly cloudy. High 61°, low 45°.
0St. Helena, Tuesday, 17 November
Overcast. High 59°, low 42°.
0.36St. Helena, Wednesday, 18 November
Rain. High 58°, low 45°.
0St. Helena, Thursday, 19 November
Partly cloudy. High 58°, low 42°.
0St. Helena, Friday, 20 November
Overcast. High 59°, low 44°.
0St. Helena, Saturday, 21 November
Overcast. High 62°, low 48°.
1.25St. Helena, Sunday, 22 November
Rain. High 54°, low 50°.
0St. Helena, Monday, 23 November
Light rain. High 61°, low 45°.
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.
0.13St. Helena, Saturday, 28 November
Climate normal for this date — 60-year average.
0.17St. Helena, Sunday, 29 November
Climate normal for this date — 60-year average.
0.19St. Helena, Monday, 30 November
Climate normal for this date — 60-year average.
0.17St. Helena, Tuesday, 1 December
Climate normal for this date — 60-year average.
0.25St. Helena, Wednesday, 2 December
Climate normal for this date — 60-year average.
0.26
St. Helena, Thursday, 3 December
Climate normal for this date — 60-year average.
0.11St. Helena, Friday, 4 December
Climate normal for this date — 60-year average.
0.12St. Helena, Saturday, 5 December
Climate normal for this date — 60-year average.
0.14St. Helena, Sunday, 6 December
Climate normal for this date — 60-year average.
0.13St. Helena, Monday, 7 December
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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