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La Mesa, California climate

BSk Cold semi-arid

La Mesa has a mildly seasonal mild-temperate climate (Cold semi-arid, Köppen BSk). The hottest month is August with an average daily high near 24°C, while the coldest is December averaging around 8°C at night. Precipitation totals about 218 mm a year and is strongly seasonal — February alone averages 53 mm while August barely receives 1 mm.

☀️ Summers

Mild

Highs near 24°C in August.

About 4 days a year above 32 °C

❄️ Winters

Cool

Lows near 8°C in December.

About 1 freezing nights a year

🌧️ Rain

Very dry

About 218 mm of rain a year.

Wettest in February

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+0.0 °C vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

La Mesa climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	20	19	19	19	20	21	23	24	24	23	21	19
Avg temp (°C)	14	14	15	15	17	18	20	21	20	18	16	14
Avg low (°C)	9	9	11	11	14	16	18	18	17	14	10	8
Precipitation (mm)	43	53	47	15	3	2	8	1	4	11	20	11

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	20	19	19	19	20	21
Avg temp (°C)	14	14	15	15	17	18
Avg low (°C)	9	9	11	11	14	16
Precipitation (mm)	43	53	47	15	3	2

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	23	24	24	23	21	19
Avg temp (°C)	20	21	20	18	16	14
Avg low (°C)	18	18	17	14	10	8
Precipitation (mm)	8	1	4	11	20	11

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	4	4	4	2	0.8	0.1	0.4	0.2	0.5	0.5	2	3
Days with high ≥ 32°C (days)	0.2	0.1	0.1	0.2	0.2	0.0	0.1	0.2	0.9	0.5	0.6	0.6
Days with low ≤ 0°C (days)	0.3	—	0.1	—	—	—	—	—	0.1	—	0.1	0.8

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	4	4	4	2	0.8	0.1
Days with high ≥ 32°C (days)	0.2	0.1	0.1	0.2	0.2	0.0
Days with low ≤ 0°C (days)	0.3	—	0.1	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	0.4	0.2	0.5	0.5	2	3
Days with high ≥ 32°C (days)	0.1	0.2	0.9	0.5	0.6	0.6
Days with low ≤ 0°C (days)	—	—	0.1	—	0.1	0.8

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	51	56	58	55	66	73	69	61	56	53	46	48
Clear days (≤ 30% cloud)	10	7	7	7	5	3	3	5	7	10	11	12
Partly cloudy days (30–70%)	10	9	11	11	10	8	11	12	11	9	11	10
Cloudy days (≥ 70%)	11	12	13	11	16	19	17	13	12	12	9	10
Relative humidity (%)	65	68	69	67	68	64	59	56	58	60	59	63
Wind speed (m/s)	2.5	2.6	2.4	2.5	2.5	2.2	2.1	2.0	1.9	2.1	2.3	2.6

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	51	56	58	55	66	73
Clear days (≤ 30% cloud)	10	7	7	7	5	3
Partly cloudy days (30–70%)	10	9	11	11	10	8
Cloudy days (≥ 70%)	11	12	13	11	16	19
Relative humidity (%)	65	68	69	67	68	64
Wind speed (m/s)	2.5	2.6	2.4	2.5	2.5	2.2

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	69	61	56	53	46	48
Clear days (≤ 30% cloud)	3	5	7	10	11	12
Partly cloudy days (30–70%)	11	12	11	9	11	10
Cloudy days (≥ 70%)	17	13	12	12	9	10
Relative humidity (%)	59	56	58	60	59	63
Wind speed (m/s)	2.1	2.0	1.9	2.1	2.3	2.6

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Imperial Beach Ream Fld Nas (NOAA GHCN station USW00093115), about 24 km from the city centre.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →