Stockton climate

Name: Stockton
Address: US

Stockton is warmest in July, with average highs of 34 °C, and coldest in January, when nights average 4.9 °C. January is the wettest month (99 mm) and July the driest (0.2 mm). Figures are 1991–2020 climate normals.

Across a full year Stockton averages 510 mm of rain, 167 days above 25 °C and 4 days below freezing.

United States · 4 m elevation · population 305,658 · 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 July 34 °C
Coldest month January 4.9 °C
Driest month July 0 mm
Wettest month January 99 mm
Least cloud August 12 % cloud
Hottest on record September 46 °C
Coldest on record January -3.5 °C

What to expectStockton through the year

Stockton has a clear annual cycle: average daily highs run from 14 °C in January to 34 °C in July, a swing of 15 °C in mean temperature across the year.

Counted across a normal year, 167 days a year reach 25 °C, 105 of them reach 30 °C, 4 nights drop below freezing. The warmest reading in the 1991–2020 record is 46 °C, in September.

Rain is strongly seasonal. January averages 99 mm against 0 mm in July — 437 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	14.1 °C	99 mm	59 %
February	16.2 °C	95 mm	56 %
March	19.0 °C	78 mm	53 %
April	22.4 °C	40 mm	44 %
May	27.1 °C	22 mm	34 %
June	31.6 °C	4 mm	20 %
July	33.6 °C	under 1 mm	12 %
August	33.0 °C	1 mm	12 %
September	31.0 °C	2 mm	14 %
October	25.7 °C	26 mm	27 %
November	18.4 °C	49 mm	46 %
December	13.8 °C	93 mm	56 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C	Days below 0 °C
January	14.1 °C	4.9 °C	8.7 °C	22.5 °C	-3.5 °C	0	0	2
February	16.2 °C	6.0 °C	10.3 °C	26.0 °C	-1.4 °C	0	0	0
March	19.0 °C	7.6 °C	12.5 °C	28.5 °C	0.5 °C	2	0	0
April	22.4 °C	9.3 °C	15.1 °C	35.3 °C	1.7 °C	8	2	0
May	27.1 °C	12.1 °C	18.8 °C	40.8 °C	6.0 °C	20	8	0
June	31.6 °C	14.6 °C	22.3 °C	42.8 °C	8.1 °C	28	19	0
July	33.6 °C	16.0 °C	23.9 °C	43.6 °C	11.0 °C	31	27	0
August	33.0 °C	15.9 °C	23.5 °C	43.1 °C	11.5 °C	31	26	0
September	31.0 °C	15.1 °C	22.1 °C	45.8 °C	9.8 °C	29	19	0
October	25.7 °C	12.2 °C	18.1 °C	38.4 °C	3.8 °C	18	4	0
November	18.4 °C	7.8 °C	12.4 °C	29.7 °C	-0.6 °C	1	0	0
December	13.8 °C	5.0 °C	8.7 °C	22.0 °C	-3.5 °C	0	0	2

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	99 mm	9	9.8 h/day	59 %	80 %	13 km/h
February	95 mm	9	11 h/day	56 %	76 %	14 km/h
March	78 mm	9	12 h/day	53 %	71 %	14 km/h
April	40 mm	5	13 h/day	44 %	61 %	16 km/h
May	22 mm	3	14 h/day	34 %	53 %	16 km/h
June	4 mm	1	15 h/day	20 %	48 %	17 km/h
July	under 1 mm	0	15 h/day	12 %	50 %	16 km/h
August	1 mm	0	14 h/day	12 %	53 %	15 km/h
September	2 mm	1	12 h/day	14 %	53 %	13 km/h
October	26 mm	3	11 h/day	27 %	57 %	12 km/h
November	49 mm	6	10 h/day	46 %	70 %	12 km/h
December	93 mm	9	9.6 h/day	56 %	76 %	13 km/h

How Stockton 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
Stockton	34 °C	4.9 °C	510 mm	167
Modesto · United States	36 °C	5.0 °C	454 mm	176
Elk Grove · United States	34 °C	4.4 °C	656 mm	165
Sacramento · United States	35 °C	4.4 °C	600 mm	172
Fremont · United States	28 °C	6.2 °C	487 mm	105

Where Stockton ranks

Ranking	Position	Value
The driest places in North America in July	2nd of 50	0.2 mm
The driest places in North America in September	9th of 50	2.4 mm
Places with the best weather in North America in April	14th of 50	94/100
The driest places in North America in August	24th of 50	1.3 mm
Places with the best weather in North America in October	26th of 50	94/100
Places with the best weather in North America in May	33rd of 50	89/100

Planning a trip? See the best time to visit Stockton.

QuestionsCommon questions about Stockton’s climate

When is the best time to visit Stockton?

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

How hot does Stockton get?

In July, the warmest month, daily highs average 34 °C. About 105 days a year pass 30 °C. The highest value in the 1991–2020 record is 46 °C.

How cold does it get in winter?

Nights average 4.9 °C in January, the coldest month. A normal year has 4 nights below freezing.

Which month is wettest in Stockton?

January, averaging 99 mm over 9 days with rain. The driest month is July with 0 mm. The year as a whole averages 510 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 Stockton 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
Data point: 37.958°, -121.291° , 4 m above sea level (the coordinates the reanalysis values are taken for)
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.