Tomales weather by month
What a typical year looks like in Tomales, California: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Graton, 21 km from Tomales; records cover 1926–2026.
The year at a glance
- Precipitation a year
- 39.9 in1014 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 5
- First fall freeze
- Nov 1
- Heating degree days
- 2,927
- Cooling degree days
- 327
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 25°−4° (heating, 99%) and 100°38° (cooling, 1%).
Month by month
Tomales in January
Highs average 58°14° and lows 37°3°, with 7.9 in200 mm of precipitation in a typical January.
- Record high
- 84°29° (1962)
- Record low
- 18°−8° (1937)
- Heating degree days
- 538
- Cooling degree days
- 0
Tomales in February
Highs average 62°17° and lows 39°4°, with 7.5 in190 mm of precipitation in a typical February.
- Record high
- 88°31° (2016)
- Record low
- 17°−8° (1989)
- Heating degree days
- 402
- Cooling degree days
- 0
Tomales in March
Highs average 66°19° and lows 41°5°, with 5.2 in132 mm of precipitation in a typical March.
- Record high
- 93°34° (2026)
- Record low
- 25°−4° (1953)
- Heating degree days
- 363
- Cooling degree days
- 0
Tomales in April
Highs average 70°21° and lows 42°6°, with 2.6 in66 mm of precipitation in a typical April.
- Record high
- 98°37° (1981)
- Record low
- 25°−4° (1936)
- Heating degree days
- 267
- Cooling degree days
- 3
Tomales in May
Highs average 75°24° and lows 46°8°, with 1.4 in36 mm of precipitation in a typical May.
- Record high
- 103°39° (1950)
- Record low
- 29°−2° (1927)
- Heating degree days
- 160
- Cooling degree days
- 16
Tomales in June
Highs average 81°27° and lows 48°9°, with 0.41 in10 mm of precipitation in a typical June.
- Record high
- 108°42° (1976)
- Record low
- 33°1° (1976)
- Heating degree days
- 60
- Cooling degree days
- 54
Tomales in July
Highs average 83°28° and lows 51°10°, with 0.01 in0.3 mm of precipitation in a typical July.
- Record high
- 113°45° (1972)
- Record low
- 38°3° (2009)
- Heating degree days
- 26
- Cooling degree days
- 74
Tomales in August
Highs average 84°29° and lows 50°10°, with 0.06 in1.5 mm of precipitation in a typical August.
- Record high
- 109°43° (2020)
- Record low
- 35°2° (2007)
- Heating degree days
- 22
- Cooling degree days
- 85
Tomales in September
Highs average 84°29° and lows 48°9°, with 0.18 in4.6 mm of precipitation in a typical September.
- Record high
- 115°46° (2022)
- Record low
- 28°−2° (2012)
- Heating degree days
- 43
- Cooling degree days
- 69
Tomales in OctoberThis month
Highs average 78°26° and lows 44°7°, with 2 in50 mm of precipitation in a typical October.
- Record high
- 106°41° (1980)
- Record low
- 22°−6° (1971)
- Heating degree days
- 143
- Cooling degree days
- 25
Tomales in November
Highs average 67°19° and lows 40°4°, with 4.4 in113 mm of precipitation in a typical November.
- Record high
- 92°33° (1929)
- Record low
- 20°−7° (1986)
- Heating degree days
- 353
- Cooling degree days
- 1
Tomales in December
Highs average 58°14° and lows 37°3°, with 8.3 in212 mm of precipitation in a typical December.
- Record high
- 81°27° (2011)
- Record low
- 14°−10° (1990)
- Heating degree days
- 550
- Cooling degree days
- 0