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Isla Vista, California climate

Csb Warm-summer Mediterranean

Isla Vista has a mildly seasonal mild-temperate climate (Warm-summer Mediterranean, Köppen Csb). The hottest month is August with an average daily high near 22°C, while the coldest is December averaging around 6°C at night. Precipitation totals about 482 mm a year and is strongly seasonal — January alone averages 119 mm while August barely receives 1 mm.

☀️ Summers

Mild

Highs near 22°C in August.

About 1 days a year above 32 °C

❄️ Winters

Cool

Lows near 6°C in December.

About 1 freezing nights a year

🌧️ Rain

Fairly dry

About 482 mm of rain a year.

Wettest in January

⛅ Sky & trend

Fairly sunny

More sun than cloud through the year.

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

Isla Vista climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	18	17	18	19	20	20	22	22	22	22	20	17
Avg temp (°C)	12	12	13	14	15	16	18	18	18	16	14	11
Avg low (°C)	6	7	8	9	11	12	14	14	14	11	8	6
Precipitation (mm)	119	110	84	26	12	4	1	1	2	21	31	71

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	18	17	18	19	20	20
Avg temp (°C)	12	12	13	14	15	16
Avg low (°C)	6	7	8	9	11	12
Precipitation (mm)	119	110	84	26	12	4

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	22	22	22	22	20	17
Avg temp (°C)	18	18	18	16	14	11
Avg low (°C)	14	14	14	11	8	6
Precipitation (mm)	1	1	2	21	31	71

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	10	10	11	7	7	6	3	3	4	4	6	8
Days with high ≥ 32°C (days)	—	—	—	0.1	0.1	—	0.2	0.1	0.5	0.3	0.1	—
Days with low ≤ 0°C (days)	0.5	—	—	0.1	—	—	—	—	—	—	0.1	0.8

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	10	10	11	7	7	6
Days with high ≥ 32°C (days)	—	—	—	0.1	0.1	—
Days with low ≤ 0°C (days)	0.5	—	—	0.1	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	3	3	4	4	6	8
Days with high ≥ 32°C (days)	0.2	0.1	0.5	0.3	0.1	—
Days with low ≤ 0°C (days)	—	—	—	—	0.1	0.8

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	47	47	45	37	34	29	25	21	24	28	36	44
Clear days (≤ 30% cloud)	12	10	11	14	16	17	21	24	20	19	15	13
Partly cloudy days (30–70%)	10	9	12	11	12	11	9	6	8	8	10	11
Cloudy days (≥ 70%)	9	9	8	5	3	2	1	0.7	2	4	5	8
Relative humidity (%)	70	73	74	71	66	58	55	53	55	58	63	68
Wind speed (km/h)	10.3	11.2	11.3	12.3	11.8	10.9	9.4	9.2	9.1	9.7	10.0	10.7

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	47	47	45	37	34	29
Clear days (≤ 30% cloud)	12	10	11	14	16	17
Partly cloudy days (30–70%)	10	9	12	11	12	11
Cloudy days (≥ 70%)	9	9	8	5	3	2
Relative humidity (%)	70	73	74	71	66	58
Wind speed (km/h)	10.3	11.2	11.3	12.3	11.8	10.9

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	25	21	24	28	36	44
Clear days (≤ 30% cloud)	21	24	20	19	15	13
Partly cloudy days (30–70%)	9	6	8	8	10	11
Cloudy days (≥ 70%)	1	0.7	2	4	5	8
Relative humidity (%)	55	53	55	58	63	68
Wind speed (km/h)	9.4	9.2	9.1	9.7	10.0	10.7

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Santa Barbara 11 W (NOAA GHCN station USW00053152), about 2 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 →