Phoenix climate

Name: Phoenix
Address: US

Phoenix is warmest in July, with average highs of 41 °C, and coldest in December, when nights average 5.0 °C. February is the wettest month (38 mm) and June the driest (1.9 mm). Figures are 1991–2020 climate normals.

Across a full year Phoenix averages 249 mm of rain, 249 days above 25 °C and 4 days below freezing.

United States · 331 m elevation · population 1,650,070 · 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 41 °C
Coldest month December 5.0 °C
Driest month June 2 mm
Wettest month February 38 mm
Least cloud June 13 % cloud
Hottest on record July 49 °C
Coldest on record January -3.5 °C

What to expectPhoenix through the year

Phoenix has a clear annual cycle: average daily highs run from 18 °C in December to 41 °C in July, a swing of 24 °C in mean temperature across the year.

Counted across a normal year, 249 days a year reach 25 °C, 194 of them reach 30 °C, 4 nights drop below freezing. The warmest reading in the 1991–2020 record is 49 °C, in July.

Rain is spread fairly evenly through the year, from 2 mm in June to 38 mm in February. There is no dry season to aim for.

Month by month

Month	Avg high	Rainfall	Cloud
January	19.3 °C	32 mm	37 %
February	21.4 °C	38 mm	39 %
March	25.6 °C	27 mm	33 %
April	30.2 °C	8 mm	25 %
May	35.1 °C	4 mm	21 %
June	40.3 °C	2 mm	13 %
July	41.4 °C	18 mm	36 %
August	40.5 °C	28 mm	34 %
September	37.6 °C	25 mm	21 %
October	31.6 °C	21 mm	20 %
November	24.4 °C	16 mm	28 %
December	18.5 °C	30 mm	36 %

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	19.3 °C	5.0 °C	11.7 °C	28.2 °C	-3.5 °C	2	0	1
February	21.4 °C	6.7 °C	13.8 °C	30.9 °C	-2.3 °C	7	0	0
March	25.6 °C	9.7 °C	17.7 °C	36.9 °C	-0.2 °C	18	5	0
April	30.2 °C	13.7 °C	22.3 °C	39.9 °C	2.7 °C	26	17	0
May	35.1 °C	19.1 °C	27.6 °C	44.1 °C	9.7 °C	31	27	0
June	40.3 °C	24.4 °C	33.0 °C	47.7 °C	13.4 °C	30	30	0
July	41.4 °C	28.2 °C	35.0 °C	48.7 °C	20.3 °C	31	31	0
August	40.5 °C	27.8 °C	34.2 °C	46.1 °C	19.7 °C	31	31	0
September	37.6 °C	23.7 °C	30.9 °C	45.3 °C	14.2 °C	30	29	0
October	31.6 °C	16.4 °C	24.2 °C	40.9 °C	4.5 °C	28	21	0
November	24.4 °C	9.7 °C	16.9 °C	35.7 °C	-0.9 °C	15	3	0
December	18.5 °C	5.0 °C	11.3 °C	27.3 °C	-3.0 °C	1	0	2

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	32 mm	4	10 h/day	37 %	53 %	13 km/h
February	38 mm	4	11 h/day	39 %	48 %	14 km/h
March	27 mm	3	12 h/day	33 %	39 %	16 km/h
April	8 mm	1	13 h/day	25 %	24 %	18 km/h
May	4 mm	1	14 h/day	21 %	19 %	18 km/h
June	2 mm	0	14 h/day	13 %	15 %	17 km/h
July	18 mm	3	14 h/day	36 %	29 %	17 km/h
August	28 mm	4	13 h/day	34 %	34 %	16 km/h
September	25 mm	3	12 h/day	21 %	33 %	15 km/h
October	21 mm	2	11 h/day	20 %	32 %	14 km/h
November	16 mm	2	10 h/day	28 %	39 %	13 km/h
December	30 mm	3	10.0 h/day	36 %	54 %	13 km/h

How Phoenix 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
Phoenix	41 °C	5.0 °C	249 mm	249
Mesa · United States	41 °C	4.7 °C	270 mm	245
Tucson · United States	38 °C	4.2 °C	251 mm	235
Nogales · Mexico	34 °C	2.3 °C	423 mm	200
San Luis Río Colorado · Mexico	42 °C	8.0 °C	81 mm	264

Where Phoenix ranks

Ranking	Position	Value
The warmest places in North America in June	2nd of 50	40 °C
The warmest places in North America in August	3rd of 50	40 °C
The warmest places in North America in July	3rd of 50	41 °C
The warmest places in North America in September	3rd of 50	38 °C
The warmest places in North America in May	8th of 50	35 °C
The warmest places in North America in October	9th of 50	32 °C

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

QuestionsCommon questions about Phoenix’s climate

When is the best time to visit Phoenix?

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

How hot does Phoenix get?

In July, the warmest month, daily highs average 41 °C. About 194 days a year pass 30 °C. The highest value in the 1991–2020 record is 49 °C.

How cold does it get in winter?

Nights average 5.0 °C in December, the coldest month. A normal year has 4 nights below freezing.

Which month is wettest in Phoenix?

February, averaging 38 mm over 4 days with rain. The driest month is June with 2 mm. The year as a whole averages 249 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 Phoenix 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: 33.448°, -112.074° , 331 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.