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Watsonville, California climate

Csb Warm-summer Mediterranean

Watsonville has a mildly seasonal mild-temperate climate (Warm-summer Mediterranean, Köppen Csb). The hottest month is September with an average daily high near 23°C, while the coldest is December averaging around 4°C at night. Precipitation totals about 576 mm a year and is strongly seasonal — December alone averages 115 mm while July barely receives 0 mm.

☀️ Summers

Mild

Highs near 23°C in September.

About 7 days a year above 32 °C

❄️ Winters

Chilly

Lows near 4°C in December.

About 8 freezing nights a year

🌧️ Rain

Moderate rainfall

About 576 mm of rain a year.

Wettest in December

⛅ Sky & trend

Fairly sunny

More sun than cloud through the year.

+0.3 °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

Watsonville climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	17	17	18	20	21	22	22	22	23	23	20	17
Avg temp (°C)	11	11	12	14	15	16	17	17	18	16	13	10
Avg low (°C)	4	5	6	7	9	11	12	13	12	9	6	4
Precipitation (mm)	113	114	91	41	15	4	0	1	2	24	57	115

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	17	17	18	20	21	22
Avg temp (°C)	11	11	12	14	15	16
Avg low (°C)	4	5	6	7	9	11
Precipitation (mm)	113	114	91	41	15	4

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	22	22	23	23	20	17
Avg temp (°C)	17	17	18	16	13	10
Avg low (°C)	12	13	12	9	6	4
Precipitation (mm)	0	1	2	24	57	115

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	10	11	10	6	3	1	0.6	0.9	0.7	3	6	10
Days with high ≥ 32°C (days)	—	—	0.0	0.3	0.7	0.6	0.3	0.6	2	2	0.2	—
Days with low ≤ 0°C (days)	3	1	0.2	0.1	—	—	—	—	—	0.0	0.6	3

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	10	11	10	6	3	1
Days with high ≥ 32°C (days)	—	—	0.0	0.3	0.7	0.6
Days with low ≤ 0°C (days)	3	1	0.2	0.1	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	0.6	0.9	0.7	3	6	10
Days with high ≥ 32°C (days)	0.3	0.6	2	2	0.2	—
Days with low ≤ 0°C (days)	—	—	—	0.0	0.6	3

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	50	51	48	43	39	33	35	33	30	31	39	48
Clear days (≤ 30% cloud)	10	9	11	12	13	16	13	15	17	18	14	11
Partly cloudy days (30–70%)	10	9	10	11	13	11	16	14	11	9	9	10
Cloudy days (≥ 70%)	11	10	10	7	5	3	2	2	2	4	7	10
Relative humidity (%)	83	83	82	79	76	71	69	69	67	68	75	80
Wind speed (mph)	2.7	2.7	2.5	2.6	2.5	2.6	2.3	2.3	2.2	2.4	2.7	3.0

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	50	51	48	43	39	33
Clear days (≤ 30% cloud)	10	9	11	12	13	16
Partly cloudy days (30–70%)	10	9	10	11	13	11
Cloudy days (≥ 70%)	11	10	10	7	5	3
Relative humidity (%)	83	83	82	79	76	71
Wind speed (mph)	2.7	2.7	2.5	2.6	2.5	2.6

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	35	33	30	31	39	48
Clear days (≤ 30% cloud)	13	15	17	18	14	11
Partly cloudy days (30–70%)	16	14	11	9	9	10
Cloudy days (≥ 70%)	2	2	2	4	7	10
Relative humidity (%)	69	69	67	68	75	80
Wind speed (mph)	2.3	2.3	2.2	2.4	2.7	3.0

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Watsonville Wtr Wks (NOAA GHCN station USC00049473), about 3 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 →