Tucson climate

Name: Tucson
Address: US

Tucson is warmest in June, with average highs of 38 °C, and coldest in December, when nights average 4.2 °C. August is the wettest month (34 mm) and May the driest (2.8 mm). Figures are 1991–2020 climate normals.

Across a full year Tucson averages 251 mm of rain, 235 days above 25 °C and 10 days below freezing.

United States · 759 m elevation · population 542,629 · 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 June 38 °C
Coldest month December 4.2 °C
Driest month May 3 mm
Wettest month August 34 mm
Least cloud June 16 % cloud
Hottest on record June 45 °C
Coldest on record February -6.3 °C

What to expectTucson through the year

Tucson has a clear annual cycle: average daily highs run from 18 °C in December to 38 °C in June, a swing of 21 °C in mean temperature across the year.

Counted across a normal year, 235 days a year reach 25 °C, 174 of them reach 30 °C, 10 nights drop below freezing. The warmest reading in the 1991–2020 record is 45 °C, in June.

Rain is spread fairly evenly through the year, from 3 mm in May to 34 mm in August. There is no dry season to aim for.

Month by month

Month	Avg high	Rainfall	Cloud
January	18.2 °C	31 mm	36 %
February	20.2 °C	28 mm	39 %
March	24.2 °C	18 mm	31 %
April	28.5 °C	6 mm	22 %
May	33.0 °C	3 mm	20 %
June	37.9 °C	4 mm	16 %
July	37.3 °C	34 mm	43 %
August	36.5 °C	34 mm	40 %
September	34.5 °C	29 mm	23 %
October	29.7 °C	16 mm	20 %
November	23.3 °C	17 mm	28 %
December	17.7 °C	32 mm	35 %

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	18.2 °C	4.2 °C	10.8 °C	28.9 °C	-4.4 °C	1	0	3
February	20.2 °C	5.6 °C	12.6 °C	31.8 °C	-6.3 °C	4	0	2
March	24.2 °C	8.6 °C	16.5 °C	34.0 °C	-2.8 °C	15	2	0
April	28.5 °C	12.3 °C	20.7 °C	38.2 °C	-0.2 °C	24	12	0
May	33.0 °C	17.2 °C	25.8 °C	41.3 °C	7.1 °C	30	25	0
June	37.9 °C	22.7 °C	31.0 °C	44.8 °C	13.1 °C	30	30	0
July	37.3 °C	25.2 °C	31.4 °C	44.5 °C	18.9 °C	31	30	0
August	36.5 °C	24.4 °C	30.5 °C	42.7 °C	17.0 °C	31	30	0
September	34.5 °C	21.4 °C	28.2 °C	42.0 °C	11.5 °C	30	28	0
October	29.7 °C	15.0 °C	22.6 °C	38.5 °C	2.4 °C	27	16	0
November	23.3 °C	8.7 °C	15.8 °C	33.6 °C	-3.4 °C	12	2	1
December	17.7 °C	4.2 °C	10.4 °C	27.4 °C	-4.1 °C	1	0	4

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	31 mm	4	10 h/day	36 %	51 %	15 km/h
February	28 mm	4	11 h/day	39 %	47 %	17 km/h
March	18 mm	3	12 h/day	31 %	36 %	19 km/h
April	6 mm	1	13 h/day	22 %	24 %	21 km/h
May	3 mm	1	14 h/day	20 %	20 %	21 km/h
June	4 mm	1	14 h/day	16 %	19 %	20 km/h
July	34 mm	7	14 h/day	43 %	39 %	17 km/h
August	34 mm	7	13 h/day	40 %	44 %	15 km/h
September	29 mm	4	12 h/day	23 %	40 %	16 km/h
October	16 mm	2	11 h/day	20 %	35 %	17 km/h
November	17 mm	2	11 h/day	28 %	40 %	16 km/h
December	32 mm	4	10 h/day	35 %	52 %	15 km/h

How Tucson 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
Tucson	38 °C	4.2 °C	251 mm	235
Nogales · Mexico	34 °C	2.3 °C	423 mm	200
Mesa · United States	41 °C	4.7 °C	270 mm	245
Phoenix · United States	41 °C	5.0 °C	249 mm	249
Hermosillo · Mexico	39 °C	9.4 °C	241 mm	298

Where Tucson ranks

Ranking	Position	Value
The warmest places in North America in June	7thof 50	38 °C
The warmest places in North America in September	8thof 50	35 °C
The driest places in North America in May	10thof 50	2.8 mm
The warmest places in North America in July	11thof 50	37 °C
The driest places in North America year-round	13thof 50	21 mm
The warmest places in North America in August	13thof 50	36 °C

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

QuestionsCommon questions about Tucson’s climate

When is the best time to visit Tucson?

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

How hot does Tucson get?

In June, the warmest month, daily highs average 38 °C. About 174 days a year pass 30 °C. The highest value in the 1991–2020 record is 45 °C.

How cold does it get in winter?

Nights average 4.2 °C in December, the coldest month. A normal year has 10 nights below freezing.

Which month is wettest in Tucson?

August, averaging 34 mm over 7 days with rain. The driest month is May with 3 mm. The year as a whole averages 251 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 Tucson 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.