Weather in Petaluma, CA
Petaluma, Thursday, 22 October, 18:54
Overcast. Feels like 57°. High 62°, low 56°.
Monthly outlook for Petaluma, CA: average high 71.2°, average low 47.8°. That is 1° above the climate normal for October. Precipitation is expected on 1 day (about 0.2 inches), against a normal of 3 days and 1.1 inches. The warmest day looks like 3 November (80.7°), the coolest 30 October (41.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 22 October – 31 October | 67.7° | 70.2° | -1.4° |
| 1 November – 10 November | 77.1° | 66.8° | +5.7° |
| 11 November – 20 November | at normal | 63° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Sonoma State University (7 mi).
0Petaluma, Friday, 23 October
Overcast. High 68°, low 54°.
0
Petaluma, Saturday, 24 October
Clear. High 74°, low 51°.
0Petaluma, Sunday, 25 October
Overcast. High 72°, low 48°.
0Petaluma, Monday, 26 October
Overcast. High 65°, low 48°.
0Petaluma, Tuesday, 27 October
Clear. High 68°, low 44°.
0Petaluma, Wednesday, 28 October
Overcast. High 69°, low 47°.
0Petaluma, Thursday, 29 October
Clear. High 66°, low 43°.
0Petaluma, Friday, 30 October
Clear. High 67°, low 41°.
0Petaluma, Saturday, 31 October
Overcast. High 67°, low 42°.
0Petaluma, Sunday, 1 November
Clear. High 72°, low 43°.
0Petaluma, Monday, 2 November
Clear. High 78°, low 46°.
0
Petaluma, Tuesday, 3 November
Mostly clear. High 81°, low 50°.
0Petaluma, Wednesday, 4 November
Clear. High 78°, low 50°.
0
Petaluma, Thursday, 5 November
Partly cloudy. High 77°, low 51°.
0Petaluma, Friday, 6 November
Overcast. High 77°, low 51°.
0.12Petaluma, Saturday, 7 November
Climate normal for this date — 60-year average.
0.09Petaluma, Sunday, 8 November
Climate normal for this date — 60-year average.
0.12Petaluma, Monday, 9 November
Climate normal for this date — 60-year average.
0.19Petaluma, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.12Petaluma, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.09Petaluma, Thursday, 12 November
Climate normal for this date — 60-year average.
0.17Petaluma, Friday, 13 November
Climate normal for this date — 60-year average.
0.07Petaluma, Saturday, 14 November
Climate normal for this date — 60-year average.
0.12Petaluma, Sunday, 15 November
Climate normal for this date — 60-year average.
0.16Petaluma, Monday, 16 November
Climate normal for this date — 60-year average.
0.17Petaluma, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.1Petaluma, Wednesday, 18 November
Climate normal for this date — 60-year average.
0.12Petaluma, Thursday, 19 November
Climate normal for this date — 60-year average.
0.15
Petaluma, 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 Petaluma, 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 Petaluma, 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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