Petaluma weather in October: Petaluma, California: normal highs, lows, rain and records for October
Petaluma in October has a normal high of 76°F and a normal low of 48°F, a daily mean of 62°F, falling from 80°F on the 1st to 72°F by the 31st. Measurable precipitation falls on 4 days in a normal October, 1.27 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 25°C and low of 9°C, 32 mm of precipitation in October.
- NOAA stationPetaluma Airport
- Station IDUSC00046826
- Location38.26°N 122.61°W
- Elevation20 ft (6 m)
- Population59,393
- Jan 58° 39°
- Feb 61° 40°
- Mar 65° 42°
- Apr 68° 44°
- May 72° 47°
- Jun 78° 50°
- Jul 81° 52°
- Aug 81° 53°
- Sep 82° 51°
- Oct 76° 48°
- Nov 66° 42°
- Dec 58° 38°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Petaluma in October?
The normal high is 76°F and the normal low 48°F, for a daily mean of 62.0°F. October is 4.5°F cooler than September and 8.1°F warmer than November. October is the 5th warmest month of the year in Petaluma and the 7th wettest. Across the month the normal high falls 8°F, from 80°F on October 1 to 72°F on October 31. From one year to the next October's mean temperature typically moves about 2.1°F either way (NOAA's standard deviation), so roughly two Octobers in three average between 60°F and 64°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 19%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| October 1 | 80°F | 50°F | 7% | 3% |
| October 8 | 79°F | 49°F | 9% | 5% |
| October 15 | 77°F | 48°F | 11% | 6% |
| October 22 | 75°F | 47°F | 14% | 8% |
| October 31 | 72°F | 45°F | 19% | 11% |
Every day of October: normal high, low and chance of precipitation (warmest afternoon October 1, coldest night October 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| October 1 | 80°F | 50°F | 7% | 3% | 11 h 50 min |
| October 2 | 80°F | 50°F | 7% | 4% | 11 h 50 min |
| October 3 | 80°F | 50°F | 7% | 4% | 11 h 50 min |
| October 4 | 80°F | 49°F | 8% | 4% | 11 h 40 min |
| October 5 | 79°F | 49°F | 8% | 4% | 11 h 40 min |
| October 6 | 79°F | 49°F | 8% | 4% | 11 h 40 min |
| October 7 | 79°F | 49°F | 8% | 4% | 11 h 40 min |
| October 8 | 79°F | 49°F | 9% | 5% | 11 h 30 min |
| October 9 | 79°F | 49°F | 9% | 5% | 11 h 30 min |
| October 10 | 78°F | 49°F | 9% | 5% | 11 h 30 min |
| October 11 | 78°F | 48°F | 10% | 5% | 11 h 30 min |
| October 12 | 78°F | 48°F | 10% | 5% | 11 h 20 min |
| October 13 | 78°F | 48°F | 10% | 6% | 11 h 20 min |
| October 14 | 77°F | 48°F | 11% | 6% | 11 h 20 min |
| October 15 | 77°F | 48°F | 11% | 6% | 11 h 20 min |
| October 16 | 77°F | 48°F | 12% | 6% | 11 h 10 min |
| October 17 | 76°F | 48°F | 12% | 7% | 11 h 10 min |
| October 18 | 76°F | 47°F | 12% | 7% | 11 h 10 min |
| October 19 | 76°F | 47°F | 13% | 7% | 11 h 10 min |
| October 20 | 76°F | 47°F | 13% | 8% | 11 h |
| October 21 | 75°F | 47°F | 14% | 8% | 11 h |
| October 22 | 75°F | 47°F | 14% | 8% | 11 h |
| October 23 | 75°F | 47°F | 15% | 9% | 11 h |
| October 24 | 74°F | 46°F | 15% | 9% | 11 h |
| October 25 | 74°F | 46°F | 16% | 9% | 10 h 50 min |
| October 26 | 74°F | 46°F | 16% | 10% | 10 h 50 min |
| October 27 | 73°F | 46°F | 17% | 10% | 10 h 50 min |
| October 28 | 73°F | 46°F | 17% | 10% | 10 h 50 min |
| October 29 | 72°F | 46°F | 18% | 11% | 10 h 40 min |
| October 30 | 72°F | 45°F | 18% | 11% | 10 h 40 min |
| October 31 | 72°F | 45°F | 19% | 11% | 10 h 40 min |
- Normal high
- 76°FOctober average
- Normal low
- 48°FOctober average
- Precipitation
- 1.27 inmonth total
- Days with precipitation
- 40.01 inch or more
- Days at 90°F or more
- 2
- Daylight
- 11 h 50 min to 10 h 40 minOctober 1 to October 31
- Days at 70°F or more
- 24
- Days at 80°F or more
- 11
- Sunshine
- 88%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00046826; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Petaluma in October?
On a given October day the chance of 0.01 inch or more is 12% on average, highest around October 31 (19%). In all, 1.27 in falls on 4 days of a normal October.
In a normal October in Petaluma, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00046826.
What are the records for October in Petaluma?
The warmest October temperature on this station's record (since 1893) is 106°F, on October 2, 1980; the coldest is 25°F, on October 30, 1948. The wettest October brought 7.96 in (2021).
The October mean against the 1991-2020 normal of 62.0°F: 2021 61.0°F (−1.0), 2022 61.8°F (−0.2), 2023 62.7°F (+0.7), 2024 65.4°F (+3.4), 2025 62.0°F (at normal). 2 of 5 ran warmer than normal.
| October | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 61.0°F | −1.0°F | 7.96 in |
| 2022 | 61.8°F | −0.2°F | 0.00 in |
| 2023 | 62.7°F | +0.7°F | 0.05 in |
| 2024 | 65.4°F | +3.4°F | 0.19 in |
| 2025 | 62.0°F | at normal | 0.95 in |
Source: records: ACIS, station USC00046826; recent months: ACIS, station USC00046826. Records and recent months use complete months only.
How does October in Petaluma compare across California?
Across the 219 places PlainClimate covers in California, October normal highs run from 58°F in Tahoma to 93°F in Brawley; Petaluma's is 76°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.