Pleasant Hill weather by month
What a typical year looks like in Pleasant Hill, California: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at MOUNT DIABLO JUNCTION, 15 km from Pleasant Hill; records cover 1952–2026.
The year at a glance
- Precipitation a year
- 26.1 in662 mm
- Snow a year
- 0.7 in1.8 cm
- Last spring freeze
- Mar 25
- First fall freeze
- Nov 28
- Heating degree days
- 3,308
- Cooling degree days
- 925
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 98°37° (cooling, 1%).
Month by month
Pleasant Hill in January
Highs average 54°12° and lows 42°5°, with 5.1 in129 mm of precipitation and 0.1 in0.3 cm of snow in a typical January.
- Record high
- 77°25° (1983)
- Record low
- 18°−8° (1962)
- Heating degree days
- 536
- Cooling degree days
- 0
Pleasant Hill in February
Highs average 55°13° and lows 42°5°, with 4.9 in124 mm of precipitation and 0.5 in1.3 cm of snow in a typical February.
- Record high
- 80°27° (1977)
- Record low
- 14°−10° (1989)
- Heating degree days
- 472
- Cooling degree days
- 0
Pleasant Hill in March
Highs average 58°14° and lows 43°6°, with 3.7 in94 mm of precipitation and 0.1 in0.3 cm of snow in a typical March.
- Record high
- 86°30° (2026)
- Record low
- 23°−5° (1991)
- Heating degree days
- 454
- Cooling degree days
- 1
Pleasant Hill in April
Highs average 62°17° and lows 44°7°, with 1.9 in49 mm of precipitation in a typical April.
- Record high
- 96°36° (1987)
- Record low
- 23°−5° (2008)
- Heating degree days
- 362
- Cooling degree days
- 8
Pleasant Hill in May
Highs average 68°20° and lows 49°10°, with 1.1 in29 mm of precipitation in a typical May.
- Record high
- 102°39° (1987)
- Record low
- 31°−1° (1988)
- Heating degree days
- 244
- Cooling degree days
- 44
Pleasant Hill in June
Highs average 76°24° and lows 55°13°, with 0.27 in6.9 mm of precipitation in a typical June.
- Record high
- 107°42° (1961)
- Record low
- 34°1° (2000)
- Heating degree days
- 100
- Cooling degree days
- 120
Pleasant Hill in July
Highs average 83°28° and lows 62°16°, with 0.01 in0.3 mm of precipitation in a typical July.
- Record high
- 111°44° (1972)
- Record low
- 34°1° (1955)
- Heating degree days
- 24
- Cooling degree days
- 241
Pleasant Hill in August
Highs average 83°28° and lows 61°16°, with 0.03 in0.8 mm of precipitation in a typical August.
- Record high
- 107°42° (1966)
- Record low
- 40°4° (2000)
- Heating degree days
- 21
- Cooling degree days
- 235
Pleasant Hill in September
Highs average 80°27° and lows 60°15°, with 0.12 in3 mm of precipitation in a typical September.
- Record high
- 107°42° (1955)
- Record low
- 35°2° (2007)
- Heating degree days
- 45
- Cooling degree days
- 190
Pleasant Hill in OctoberThis month
Highs average 72°22° and lows 54°12°, with 1.2 in30 mm of precipitation in a typical October.
- Record high
- 100°38° (2024)
- Record low
- 30°−1° (1990)
- Heating degree days
- 145
- Cooling degree days
- 78
Pleasant Hill in November
Highs average 60°16° and lows 46°8°, with 2.7 in67 mm of precipitation in a typical November.
- Record high
- 90°32° (1966)
- Record low
- 26°−3° (1985)
- Heating degree days
- 358
- Cooling degree days
- 8
Pleasant Hill in December
Highs average 53°12° and lows 41°5°, with 5.1 in129 mm of precipitation in a typical December.
- Record high
- 77°25° (1980)
- Record low
- 14°−10° (1990)
- Heating degree days
- 547
- Cooling degree days
- 0