La Mesa weather by month
What a typical year looks like in La Mesa, California: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at San Diego International Airport, 16 km from La Mesa; records cover 1874–2026.
The year at a glance
- Precipitation a year
- 9.8 in249 mm
- Snow a year
- Rare
- Last spring freeze
- Rare
- First fall freeze
- Rare
- Heating degree days
- 990
- Cooling degree days
- 894
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 43°6° (heating, 99%) and 89°32° (cooling, 1%).
Month by month
La Mesa in January
Highs average 66°19° and lows 50°10°, with 2 in50 mm of precipitation in a typical January.
- Record high
- 88°31° (1953)
- Record low
- 25°−4° (1913)
- Heating degree days
- 209
- Cooling degree days
- 3
La Mesa in February
Highs average 66°19° and lows 52°11°, with 2.2 in56 mm of precipitation in a typical February.
- Record high
- 91°33° (2022)
- Record low
- 34°1° (1891)
- Heating degree days
- 173
- Cooling degree days
- 5
La Mesa in March
Highs average 67°19° and lows 55°13°, with 1.5 in37 mm of precipitation in a typical March.
- Record high
- 99°37° (1879)
- Record low
- 36°2° (1894)
- Heating degree days
- 142
- Cooling degree days
- 10
La Mesa in April
Highs average 69°20° and lows 57°14°, with 0.65 in17 mm of precipitation in a typical April.
- Record high
- 98°37° (1989)
- Record low
- 39°4° (1875)
- Heating degree days
- 85
- Cooling degree days
- 23
La Mesa in May
Highs average 70°21° and lows 60°16°, with 0.28 in7.1 mm of precipitation in a typical May.
- Record high
- 98°37° (1896)
- Record low
- 45°7° (1883)
- Heating degree days
- 45
- Cooling degree days
- 37
La Mesa in June
Highs average 72°22° and lows 63°17°, with 0.05 in1.3 mm of precipitation in a typical June.
- Record high
- 101°38° (1979)
- Record low
- 50°10° (1884)
- Heating degree days
- 10
- Cooling degree days
- 75
La Mesa in July
Highs average 75°24° and lows 66°19°, with 0.08 in2 mm of precipitation in a typical July.
- Record high
- 100°38° (1930)
- Record low
- 54°12° (1880)
- Heating degree days
- 1
- Cooling degree days
- 177
La Mesa in August
Highs average 77°25° and lows 68°20°, with 0.01 in0.3 mm of precipitation in a typical August.
- Record high
- 98°37° (1955)
- Record low
- 54°12° (1879)
- Heating degree days
- 0
- Cooling degree days
- 230
La Mesa in September
Highs average 77°25° and lows 66°19°, with 0.12 in3 mm of precipitation in a typical September.
- Record high
- 111°44° (1963)
- Record low
- 50°10° (1880)
- Heating degree days
- 0
- Cooling degree days
- 201
La Mesa in OctoberThis month
Highs average 75°24° and lows 62°16°, with 0.5 in13 mm of precipitation in a typical October.
- Record high
- 107°42° (1961)
- Record low
- 43°6° (1971)
- Heating degree days
- 11
- Cooling degree days
- 106
La Mesa in November
Highs average 71°22° and lows 55°13°, with 0.79 in20 mm of precipitation in a typical November.
- Record high
- 100°38° (2010)
- Record low
- 36°2° (1919)
- Heating degree days
- 93
- Cooling degree days
- 26
La Mesa in December
Highs average 66°19° and lows 50°10°, with 1.7 in42 mm of precipitation in a typical December.
- Record high
- 88°31° (1963)
- Record low
- 32°0° (1879)
- Heating degree days
- 221
- Cooling degree days
- 1