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Oceanside, California climate

BSk Cold semi-arid

Oceanside has a mildly seasonal mild-temperate climate (Cold semi-arid, Köppen BSk). The hottest month is August with an average daily high near 71°F, while the coldest is December averaging around 47°F at night. Precipitation totals about 10 inches a year and is strongly seasonal — February alone averages 2.4 inches while August barely receives 0.02 inches.

☀️ Summers

Mild

Highs near 71°F in August.

❄️ Winters

Cool

Lows near 47°F in December.

🌧️ Rain

Fairly dry

About 10 in of rain a year.

Wettest in February

⛅ Sky & trend

Fairly sunny

More sun than cloud through the year.

+0.3 °F 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

Oceanside climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	63	62	62	63	65	66	70	71	71	70	67	63
Avg temp (°F)	55	55	56	58	61	64	67	68	67	64	59	55
Avg low (°F)	47	48	51	53	58	61	65	66	64	58	51	47
Precipitation (in)	2.2	2.4	1.4	0.8	0.3	0.1	0.0	0.0	0.2	0.6	0.8	1.6

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	63	62	62	63	65	66
Avg temp (°F)	55	55	56	58	61	64
Avg low (°F)	47	48	51	53	58	61
Precipitation (in)	2.2	2.4	1.4	0.8	0.3	0.1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	70	71	71	70	67	63
Avg temp (°F)	67	68	67	64	59	55
Avg low (°F)	65	66	64	58	51	47
Precipitation (in)	0.0	0.0	0.2	0.6	0.8	1.6

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	6	6	4	3	2	0.7	0.5	0.3	0.6	2	3	5
Days with high ≥ 90°F (days)	—	—	—	0.1	0.1	—	—	0.0	0.1	0.2	0.1	—
Days with low ≤ 32°F (days)	0.1	—	—	—	—	—	—	0.0	—	—	—	—

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	6	6	4	3	2	0.7
Days with high ≥ 90°F (days)	—	—	—	0.1	0.1	—
Days with low ≤ 32°F (days)	0.1	—	—	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	0.5	0.3	0.6	2	3	5
Days with high ≥ 90°F (days)	—	0.0	0.1	0.2	0.1	—
Days with low ≤ 32°F (days)	—	0.0	—	—	—	—

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	44	46	44	40	43	39	34	27	29	35	34	41
Clear days (≤ 30% cloud)	13	11	12	13	11	11	15	18	17	16	15	14
Partly cloudy days (30–70%)	9	9	12	11	15	15	14	12	10	10	10	9
Cloudy days (≥ 70%)	9	8	8	6	6	4	2	1.0	3	5	5	7
Relative humidity (%)	71	73	75	75	78	78	76	73	72	71	68	68
Wind speed (mph)	5.7	6.4	6.2	6.5	6.0	5.1	4.8	4.9	5.1	5.1	5.5	6.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	44	46	44	40	43	39
Clear days (≤ 30% cloud)	13	11	12	13	11	11
Partly cloudy days (30–70%)	9	9	12	11	15	15
Cloudy days (≥ 70%)	9	8	8	6	6	4
Relative humidity (%)	71	73	75	75	78	78
Wind speed (mph)	5.7	6.4	6.2	6.5	6.0	5.1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	34	27	29	35	34	41
Clear days (≤ 30% cloud)	15	18	17	16	15	14
Partly cloudy days (30–70%)	14	12	10	10	10	9
Cloudy days (≥ 70%)	2	1.0	3	5	5	7
Relative humidity (%)	76	73	72	71	68	68
Wind speed (mph)	4.8	4.9	5.1	5.1	5.5	6.1

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Oceanside Marina (NOAA GHCN station USC00046377), 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 →