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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 72°F, while the coldest is December averaging around 42°F at night. Precipitation totals about 19 inches a year and is strongly seasonal — January alone averages 4.7 inches while August barely receives 0.03 inches.

☀️ Summers

Mild

Highs near 72°F in August.

About 1 days a year above 90 °F

❄️ Winters

Cool

Lows near 42°F in December.

About 1 freezing nights a year

🌧️ Rain

Fairly dry

About 19 in 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 (°F)	64	62	65	65	68	68	71	72	71	72	68	63
Avg temp (°F)	53	53	56	57	59	61	64	64	64	62	57	53
Avg low (°F)	43	44	46	48	51	54	57	57	56	51	46	42
Precipitation (in)	4.7	4.3	3.3	1.0	0.5	0.1	0.1	0.0	0.1	0.8	1.2	2.8

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	64	62	65	65	68	68
Avg temp (°F)	53	53	56	57	59	61
Avg low (°F)	43	44	46	48	51	54
Precipitation (in)	4.7	4.3	3.3	1.0	0.5	0.1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	71	72	71	72	68	63
Avg temp (°F)	64	64	64	62	57	53
Avg low (°F)	57	57	56	51	46	42
Precipitation (in)	0.1	0.0	0.1	0.8	1.2	2.8

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 ≥ 90°F (days)	—	—	—	0.1	0.1	—	0.2	0.1	0.5	0.3	0.1	—
Days with low ≤ 32°F (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 ≥ 90°F (days)	—	—	—	0.1	0.1	—
Days with low ≤ 32°F (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 ≥ 90°F (days)	0.2	0.1	0.5	0.3	0.1	—
Days with low ≤ 32°F (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 (mph)	6.4	7.0	7.0	7.6	7.3	6.8	5.8	5.7	5.7	6.0	6.2	6.6

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 (mph)	6.4	7.0	7.0	7.6	7.3	6.8

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 (mph)	5.8	5.7	5.7	6.0	6.2	6.6

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 →