San Jose climate

Name: San Jose
Address: US

San Jose is warmest in August, with average highs of 29 °C, and coldest in January, when nights average 6.4 °C. February is the wettest month (127 mm) and July the driest (0.8 mm). Figures are 1991–2020 climate normals.

Across a full year San Jose averages 627 mm of rain, 122 days above 25 °C and 0 days below freezing.

United States · 26 m elevation · population 997,368 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month August 29 °C
Coldest month January 6.4 °C
Driest month July 1 mm
Wettest month February 127 mm
Least cloud September 22 % cloud
Hottest on record September 44 °C
Coldest on record December -2.8 °C

What to expectSan Jose through the year

San Jose has a clear annual cycle: average daily highs run from 15 °C in January to 29 °C in August, a swing of 11 °C in mean temperature across the year.

Counted across a normal year, 122 days a year reach 25 °C, 45 of them reach 30 °C, 0 nights drop below freezing. The warmest reading in the 1991–2020 record is 44 °C, in September.

Rain is strongly seasonal. February averages 127 mm against 1 mm in July — 162 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	15.2 °C	122 mm	59 %
February	16.3 °C	127 mm	58 %
March	18.0 °C	95 mm	57 %
April	20.0 °C	48 mm	49 %
May	22.8 °C	22 mm	43 %
June	26.3 °C	4 mm	29 %
July	28.5 °C	1 mm	22 %
August	28.8 °C	1 mm	22 %
September	28.4 °C	3 mm	22 %
October	24.6 °C	29 mm	32 %
November	18.6 °C	59 mm	48 %
December	14.7 °C	117 mm	55 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	15.2 °C	6.4 °C	10.0 °C	26.2 °C	-2.7 °C	0	0
February	16.3 °C	7.2 °C	11.0 °C	25.8 °C	-0.8 °C	0	0
March	18.0 °C	8.5 °C	12.4 °C	28.6 °C	0.2 °C	2	0
April	20.0 °C	9.4 °C	13.7 °C	34.9 °C	2.1 °C	4	1
May	22.8 °C	11.2 °C	16.0 °C	36.7 °C	4.5 °C	9	3
June	26.3 °C	13.2 °C	18.6 °C	40.8 °C	5.9 °C	17	7
July	28.5 °C	15.0 °C	20.6 °C	42.6 °C	8.3 °C	25	10
August	28.8 °C	15.5 °C	20.8 °C	40.6 °C	10.1 °C	27	11
September	28.4 °C	15.8 °C	20.6 °C	43.6 °C	9.4 °C	23	10
October	24.6 °C	13.5 °C	17.9 °C	39.4 °C	4.4 °C	14	4
November	18.6 °C	9.4 °C	13.2 °C	30.2 °C	1.0 °C	2	0
December	14.7 °C	6.6 °C	10.0 °C	22.9 °C	-2.8 °C	0	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	122 mm	9	9.9 h/day	59 %	78 %	12 km/h
February	127 mm	10	11 h/day	58 %	77 %	13 km/h
March	95 mm	9	12 h/day	57 %	76 %	14 km/h
April	48 mm	6	13 h/day	49 %	71 %	15 km/h
May	22 mm	3	14 h/day	43 %	67 %	15 km/h
June	4 mm	1	15 h/day	29 %	62 %	14 km/h
July	1 mm	0	14 h/day	22 %	61 %	12 km/h
August	1 mm	0	14 h/day	22 %	62 %	12 km/h
September	3 mm	1	12 h/day	22 %	61 %	12 km/h
October	29 mm	3	11 h/day	32 %	63 %	12 km/h
November	59 mm	6	10 h/day	48 %	71 %	11 km/h
December	117 mm	9	9.6 h/day	55 %	76 %	12 km/h

How San Jose compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
San Jose	29 °C	6.4 °C	627 mm	122
Sunnyvale · United States	28 °C	6.3 °C	620 mm	105
Fremont · United States	28 °C	6.2 °C	487 mm	105
Oakland · United States	26 °C	6.0 °C	498 mm	87

Where San Jose ranks

Ranking	Position	Value
Places with the best weather in North America in May	3rdof 50	96/100
Places with the best weather in North America in October	4thof 50	96/100
The driest places in North America in September	10thof 50	2.6 mm
The driest places in North America in July	11thof 50	0.8 mm
Places with the best weather in the world in May	16thof 50	96/100
Places with the best weather in North America in June	17thof 50	92/100

Planning a trip? See the best time to visit San Jose.

QuestionsCommon questions about San Jose’s climate

When is the best time to visit San Jose?

That depends on what you want, so the honest answer is a comparison rather than a single month. July, August, September sit closest to 20 °C on average, August is the warmest month and July the driest. The month-by-month table above has the full picture.

How hot does San Jose get?

In August, the warmest month, daily highs average 29 °C. About 45 days a year pass 30 °C. The highest value in the 1991–2020 record is 44 °C.

How cold does it get in winter?

Nights average 6.4 °C in January, the coldest month. A normal year has 0 nights below freezing.

Which month is wettest in San Jose?

February, averaging 127 mm over 10 days with rain. The driest month is July with 1 mm. The year as a whole averages 627 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in San Jose rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.