Sunol weather by month
What a typical year looks like in Sunol, California: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at MOFFETT FEDERAL AIRFIELD, 25 km from Sunol; records cover 1945–2026.
The year at a glance
- Precipitation a year
- 13.5 in342 mm
- Snow a year
- Rare
- Last spring freeze
- Jan 14
- First fall freeze
- Dec 8
- Heating degree days
- 2,264
- Cooling degree days
- 427
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 34°1° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Sunol in January
Highs average 59°15° and lows 42°6°, with 2.5 in63 mm of precipitation in a typical January.
- Record high
- 76°24° (1948)
- Record low
- 21°−6° (1949)
- Heating degree days
- 443
- Cooling degree days
- 0
Sunol in February
Highs average 62°17° and lows 45°7°, with 2.9 in74 mm of precipitation in a typical February.
- Record high
- 82°28° (1977)
- Record low
- 26°−3° (1946)
- Heating degree days
- 332
- Cooling degree days
- 0
Sunol in March
Highs average 65°18° and lows 47°8°, with 2 in52 mm of precipitation in a typical March.
- Record high
- 86°30° (2026)
- Record low
- 30°−1° (1951)
- Heating degree days
- 285
- Cooling degree days
- 1
Sunol in April
Highs average 68°20° and lows 49°9°, with 0.98 in25 mm of precipitation in a typical April.
- Record high
- 95°35° (1981)
- Record low
- 32°0° (1945)
- Heating degree days
- 205
- Cooling degree days
- 9
Sunol in May
Highs average 72°22° and lows 53°11°, with 0.43 in11 mm of precipitation in a typical May.
- Record high
- 103°39° (1976)
- Record low
- 38°3° (1950)
- Heating degree days
- 116
- Cooling degree days
- 26
Sunol in June
Highs average 76°24° and lows 56°13°, with 0.1 in2.5 mm of precipitation in a typical June.
- Record high
- 106°41° (2000)
- Record low
- 43°6° (1955)
- Heating degree days
- 39
- Cooling degree days
- 63
Sunol in July
Highs average 77°25° and lows 59°15°, with 0 in0 mm of precipitation in a typical July.
- Record high
- 103°39° (1993)
- Record low
- 45°7° (1955)
- Heating degree days
- 11
- Cooling degree days
- 94
Sunol in August
Highs average 77°25° and lows 59°15°, with 0.01 in0.3 mm of precipitation in a typical August.
- Record high
- 101°38° (1993)
- Record low
- 47°8° (1946)
- Heating degree days
- 8
- Cooling degree days
- 99
Sunol in September
Highs average 78°25° and lows 57°14°, with 0.07 in1.8 mm of precipitation in a typical September.
- Record high
- 106°41° (2017)
- Record low
- 41°5° (1946)
- Heating degree days
- 18
- Cooling degree days
- 93
Sunol in OctoberThis month
Highs average 74°23° and lows 53°12°, with 0.56 in14 mm of precipitation in a typical October.
- Record high
- 100°38° (1987)
- Record low
- 33°1° (1946)
- Heating degree days
- 83
- Cooling degree days
- 40
Sunol in November
Highs average 66°19° and lows 46°8°, with 1.4 in35 mm of precipitation in a typical November.
- Record high
- 87°31° (1967)
- Record low
- 29°−2° (1947)
- Heating degree days
- 275
- Cooling degree days
- 2
Sunol in December
Highs average 59°15° and lows 42°6°, with 2.5 in64 mm of precipitation in a typical December.
- Record high
- 78°26° (2003)
- Record low
- 23°−5° (1990)
- Heating degree days
- 449
- Cooling degree days
- 0