Vacaville weather by month
What a typical year looks like in Vacaville, California: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Winters, 19 km from Vacaville; records cover 1942–2026.
The year at a glance
- Precipitation a year
- 23.8 in604 mm
- Snow a year
- Rare
- Last spring freeze
- Feb 5
- First fall freeze
- Dec 1
- Heating degree days
- 2,392
- Cooling degree days
- 1,540
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 29°−2° (heating, 99%) and 106°41° (cooling, 1%).
Month by month
Vacaville in January
Highs average 57°14° and lows 38°3°, with 5.2 in131 mm of precipitation in a typical January.
- Record high
- 82°28° (1948)
- Record low
- 18°−8° (1950)
- Heating degree days
- 558
- Cooling degree days
- 0
Vacaville in February
Highs average 62°17° and lows 41°5°, with 5 in128 mm of precipitation in a typical February.
- Record high
- 84°29° (2016)
- Record low
- 22°−6° (1989)
- Heating degree days
- 385
- Cooling degree days
- 0
Vacaville in March
Highs average 68°20° and lows 44°7°, with 3.2 in82 mm of precipitation in a typical March.
- Record high
- 92°33° (1988)
- Record low
- 28°−2° (1951)
- Heating degree days
- 284
- Cooling degree days
- 4
Vacaville in April
Highs average 74°23° and lows 48°9°, with 1.4 in35 mm of precipitation in a typical April.
- Record high
- 99°37° (2004)
- Record low
- 29°−2° (1954)
- Heating degree days
- 154
- Cooling degree days
- 29
Vacaville in May
Highs average 83°28° and lows 53°12°, with 0.8 in20 mm of precipitation in a typical May.
- Record high
- 108°42° (2008)
- Record low
- 36°2° (2022)
- Heating degree days
- 50
- Cooling degree days
- 134
Vacaville in June
Highs average 90°32° and lows 58°14°, with 0.15 in3.8 mm of precipitation in a typical June.
- Record high
- 115°46° (1961)
- Record low
- 44°7° (1943)
- Heating degree days
- 6
- Cooling degree days
- 276
Vacaville in July
Highs average 95°35° and lows 60°15°, with 0.01 in0.3 mm of precipitation in a typical July.
- Record high
- 115°46° (1972)
- Record low
- 46°8° (1955)
- Heating degree days
- 0
- Cooling degree days
- 385
Vacaville in August
Highs average 95°35° and lows 59°15°, with 0.02 in0.5 mm of precipitation in a typical August.
- Record high
- 113°45° (1978)
- Record low
- 44°7° (1955)
- Heating degree days
- 0
- Cooling degree days
- 361
Vacaville in September
Highs average 91°33° and lows 57°14°, with 0.09 in2.3 mm of precipitation in a typical September.
- Record high
- 112°44° (1950)
- Record low
- 42°6° (1948)
- Heating degree days
- 4
- Cooling degree days
- 266
Vacaville in OctoberThis month
Highs average 81°27° and lows 50°10°, with 0.87 in22 mm of precipitation in a typical October.
- Record high
- 106°41° (2001)
- Record low
- 32°0° (1949)
- Heating degree days
- 72
- Cooling degree days
- 83
Vacaville in November
Highs average 66°19° and lows 42°6°, with 2.2 in56 mm of precipitation in a typical November.
- Record high
- 90°32° (1967)
- Record low
- 25°−4° (1947)
- Heating degree days
- 323
- Cooling degree days
- 2
Vacaville in December
Highs average 57°14° and lows 37°3°, with 4.9 in123 mm of precipitation in a typical December.
- Record high
- 79°26° (1958)
- Record low
- 15°−9° (1990)
- Heating degree days
- 556
- Cooling degree days
- 0