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Morgan Hill, California climate

Csb Warm-summer Mediterranean

Morgan Hill has a mildly seasonal mild-temperate climate (Warm-summer Mediterranean, Köppen Csb). The hottest month is July with an average daily high near 29°C, while the coldest is December averaging around 4°C at night. Precipitation totals about 564 mm a year and is strongly seasonal — January alone averages 128 mm while July barely receives 0 mm.

☀️ Summers

Warm

Highs near 29°C in July.

About 23 days a year above 32 °C

❄️ Winters

Chilly

Lows near 4°C in December.

About 11 freezing nights a year

🌧️ Rain

Moderate rainfall

About 564 mm of rain a year.

Wettest in January

⛅ 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

Morgan Hill climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	15	17	19	21	24	28	29	29	28	24	18	14
Avg temp (°C)	9	11	13	14	17	20	21	21	20	17	12	9
Avg low (°C)	4	5	6	7	10	11	13	13	12	9	6	4
Precipitation (mm)	128	124	87	35	13	4	0	1	1	19	50	101

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	15	17	19	21	24	28
Avg temp (°C)	9	11	13	14	17	20
Avg low (°C)	4	5	6	7	10	11
Precipitation (mm)	128	124	87	35	13	4

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	29	29	28	24	18	14
Avg temp (°C)	21	21	20	17	12	9
Avg low (°C)	13	13	12	9	6	4
Precipitation (mm)	0	1	1	19	50	101

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	9	8	7	5	2	0.8	—	0.1	0.3	2	5	8
Days with high ≥ 32°C (days)	—	—	0.0	0.5	1	5	6	5	5	0.8	—	—
Days with low ≤ 0°C (days)	4	1	0.3	0.2	—	0.0	—	—	—	—	1.0	4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	9	8	7	5	2	0.8
Days with high ≥ 32°C (days)	—	—	0.0	0.5	1	5
Days with low ≤ 0°C (days)	4	1	0.3	0.2	—	0.0

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	—	0.1	0.3	2	5	8
Days with high ≥ 32°C (days)	6	5	5	0.8	—	—
Days with low ≤ 0°C (days)	—	—	—	—	1.0	4

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	55	53	49	42	33	20	14	14	16	26	41	52
Clear days (≤ 30% cloud)	9	9	11	13	18	23	27	27	25	21	14	9
Partly cloudy days (30–70%)	10	9	9	9	8	5	3	3	4	7	9	11
Cloudy days (≥ 70%)	13	10	10	7	5	2	0.7	1	1	4	8	11
Relative humidity (%)	83	83	82	79	76	71	69	69	67	68	75	80
Wind speed (m/s)	1.2	1.2	1.1	1.2	1.1	1.1	1.0	1.0	1.0	1.1	1.2	1.3

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	55	53	49	42	33	20
Clear days (≤ 30% cloud)	9	9	11	13	18	23
Partly cloudy days (30–70%)	10	9	9	9	8	5
Cloudy days (≥ 70%)	13	10	10	7	5	2
Relative humidity (%)	83	83	82	79	76	71
Wind speed (m/s)	1.2	1.2	1.1	1.2	1.1	1.1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	14	14	16	26	41	52
Clear days (≤ 30% cloud)	27	27	25	21	14	9
Partly cloudy days (30–70%)	3	3	4	7	9	11
Cloudy days (≥ 70%)	0.7	1	1	4	8	11
Relative humidity (%)	69	69	67	68	75	80
Wind speed (m/s)	1.0	1.0	1.0	1.1	1.2	1.3

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Los Gatos (NOAA GHCN station USC00045123), about 29 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 →