Weather in Petaluma, CA
Petaluma, Thursday, 29 October, 15:42
Clear. Feels like 68°. High 69°, low 48°.
Monthly outlook for Petaluma, CA: average high 65.3°, average low 47.8°. That is 0.8° below the climate normal for October. Precipitation is expected on 5 days (about 2.8 inches), against a normal of 3 days and 1.5 inches. The warmest day looks like 30 October (71.3°), the coolest 31 October (42.7°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 29 October – 7 November | 67.3° | 68.1° | -0.4° |
| 8 November – 17 November | 61.9° | 63.9° | -1.1° |
| 18 November – 27 November | at normal | 61° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Sonoma State University (7 mi).
0Petaluma, Friday, 30 October
Clear. High 71°, low 45°.
0
Petaluma, Saturday, 31 October
Overcast. High 66°, low 43°.
0Petaluma, Sunday, 1 November
Clear. High 65°, low 46°.
0Petaluma, Monday, 2 November
Overcast. High 68°, low 47°.
0Petaluma, Tuesday, 3 November
Overcast. High 65°, low 49°.
0.14
Petaluma, Wednesday, 4 November
Light rain. High 64°, low 51°.
0.02Petaluma, Thursday, 5 November
Light rain. High 66°, low 48°.
0
Petaluma, Friday, 6 November
Partly cloudy. High 69°, low 44°.
0Petaluma, Saturday, 7 November
Partly cloudy. High 70°, low 47°.
0.22Petaluma, Sunday, 8 November
Rain. High 67°, low 52°.
1.78Petaluma, Monday, 9 November
Heavy rain. High 63°, low 53°.
0.3Petaluma, Tuesday, 10 November
Light rain. High 62°, low 52°.
0.02Petaluma, Wednesday, 11 November
Light rain. High 64°, low 49°.
0.28Petaluma, Thursday, 12 November
Rain. High 58°, low 46°.
0Petaluma, Friday, 13 November
Overcast. High 59°, low 44°.
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.
0.17Petaluma, Saturday, 21 November
Climate normal for this date — 60-year average.
0.16Petaluma, Sunday, 22 November
Climate normal for this date — 60-year average.
0.09
Petaluma, Monday, 23 November
Climate normal for this date — 60-year average.
0.09Petaluma, Tuesday, 24 November
Climate normal for this date — 60-year average.
0.07Petaluma, Wednesday, 25 November
Climate normal for this date — 60-year average.
0.08Petaluma, Thursday, 26 November
Climate normal for this date — 60-year average.
0.1Petaluma, 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 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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