Sebastopol weather by month
What a typical year looks like in Sebastopol, California: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at PETALUMA AIRPORT, 25 km from Sebastopol; records cover 1893–2026.
The year at a glance
- Precipitation a year
- 25.6 in649 mm
- Snow a year
- Rare
- Last spring freeze
- Feb 26
- First fall freeze
- Nov 23
- Heating degree days
- 2,851
- Cooling degree days
- 316
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 28°−2° (heating, 99%) and 97°36° (cooling, 1%).
Month by month
Sebastopol in January
Highs average 58°14° and lows 39°4°, with 4.8 in121 mm of precipitation in a typical January.
- Record high
- 85°29° (1962)
- Record low
- 18°−8° (1919)
- Heating degree days
- 518
- Cooling degree days
- 0
Sebastopol in February
Highs average 61°16° and lows 40°5°, with 5.2 in133 mm of precipitation in a typical February.
- Record high
- 89°32° (1913)
- Record low
- 18°−8° (1989)
- Heating degree days
- 396
- Cooling degree days
- 0
Sebastopol in March
Highs average 65°18° and lows 42°5°, with 3.3 in84 mm of precipitation in a typical March.
- Record high
- 93°34° (1914)
- Record low
- 24°−4° (1918)
- Heating degree days
- 366
- Cooling degree days
- 0
Sebastopol in April
Highs average 68°20° and lows 44°7°, with 1.7 in43 mm of precipitation in a typical April.
- Record high
- 97°36° (1981)
- Record low
- 24°−4° (1971)
- Heating degree days
- 278
- Cooling degree days
- 2
Sebastopol in May
Highs average 72°22° and lows 47°9°, with 0.93 in24 mm of precipitation in a typical May.
- Record high
- 101°38° (1950)
- Record low
- 27°−3° (1985)
- Heating degree days
- 178
- Cooling degree days
- 12
Sebastopol in June
Highs average 78°26° and lows 50°10°, with 0.28 in7.1 mm of precipitation in a typical June.
- Record high
- 110°43° (1960)
- Record low
- 32°0° (1930)
- Heating degree days
- 68
- Cooling degree days
- 46
Sebastopol in July
Highs average 81°27° and lows 52°11°, with 0.01 in0.3 mm of precipitation in a typical July.
- Record high
- 110°43° (1972)
- Record low
- 39°4° (1919)
- Heating degree days
- 22
- Cooling degree days
- 72
Sebastopol in August
Highs average 81°27° and lows 53°12°, with 0.05 in1.3 mm of precipitation in a typical August.
- Record high
- 105°41° (1950)
- Record low
- 39°4° (1916)
- Heating degree days
- 18
- Cooling degree days
- 80
Sebastopol in September
Highs average 82°28° and lows 51°11°, with 0.09 in2.3 mm of precipitation in a typical September.
- Record high
- 109°43° (1913)
- Record low
- 31°−1° (1929)
- Heating degree days
- 31
- Cooling degree days
- 76
Sebastopol in OctoberThis month
Highs average 76°25° and lows 48°9°, with 1.3 in32 mm of precipitation in a typical October.
- Record high
- 106°41° (1980)
- Record low
- 25°−4° (1948)
- Heating degree days
- 120
- Cooling degree days
- 27
Sebastopol in November
Highs average 66°19° and lows 42°6°, with 2.7 in70 mm of precipitation in a typical November.
- Record high
- 91°33° (1932)
- Record low
- 20°−7° (1916)
- Heating degree days
- 334
- Cooling degree days
- 1
Sebastopol in December
Highs average 58°14° and lows 38°4°, with 5.2 in132 mm of precipitation in a typical December.
- Record high
- 81°27° (1967)
- Record low
- 16°−9° (1932)
- Heating degree days
- 522
- Cooling degree days
- 0