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Chula Vista, California climate

BSk Cold semi-arid

Chula Vista 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

Chula Vista 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 9 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 →