Home › Cities › United States › Arizona › Phoenix

Phoenix, Arizona climate

BWh Hot desert

Phoenix has a seasonal tropical climate (Hot desert, Köppen BWh). The hottest month is July with an average daily high near 107°F, while the coldest is December averaging around 45°F at night. Precipitation totals about 7 inches a year and is strongly seasonal — August alone averages 0.9 inches while June barely receives 0.02 inches.

☀️ Summers

Extreme heat

Highs near 107°F in July.

About 173 days a year above 90 °F

❄️ Winters

Cool

Lows near 45°F in December.

🌧️ Rain

Very dry

About 7 in of rain a year.

Wettest in August

⛅ Sky & trend

Fairly sunny

More sun than cloud through the year.

+1.6 °F 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

Hours of sunshine per day

Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)

Phoenix climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	68	71	78	86	95	104	107	105	100	89	77	66
Avg temp (°F)	57	60	66	73	82	91	96	94	89	77	65	56
Avg low (°F)	46	49	55	61	70	79	85	84	78	66	54	45
Precipitation (in)	0.9	0.9	0.8	0.2	0.1	0.0	0.9	0.9	0.6	0.6	0.6	0.7

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	68	71	78	86	95	104
Avg temp (°F)	57	60	66	73	82	91
Avg low (°F)	46	49	55	61	70	79
Precipitation (in)	0.9	0.9	0.8	0.2	0.1	0.0

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	107	105	100	89	77	66
Avg temp (°F)	96	94	89	77	65	56
Avg low (°F)	85	84	78	66	54	45
Precipitation (in)	0.9	0.9	0.6	0.6	0.6	0.7

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	4	4	3	2	1	0.5	4	5	3	2	2	4
Days with high ≥ 90°F (days)	—	0.0	2	10	24	29	31	31	28	17	1	—
Days with low ≤ 32°F (days)	0.4	0.1	—	—	—	—	—	—	—	—	—	0.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	4	4	3	2	1	0.5
Days with high ≥ 90°F (days)	—	0.0	2	10	24	29
Days with low ≤ 32°F (days)	0.4	0.1	—	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	4	5	3	2	2	4
Days with high ≥ 90°F (days)	31	31	28	17	1	—
Days with low ≤ 32°F (days)	—	—	—	—	—	0.1

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	42	44	38	31	26	20	43	42	28	27	33	42
Relative humidity (%)	47	45	40	31	23	16	29	35	32	30	35	45
Wind speed (mph)	4.3	4.3	4.4	4.9	4.9	5.0	4.5	4.0	4.3	4.4	4.4	4.2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	42	44	38	31	26	20
Relative humidity (%)	47	45	40	31	23	16
Wind speed (mph)	4.3	4.3	4.4	4.9	4.9	5.0

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	43	42	28	27	33	42
Relative humidity (%)	29	35	32	30	35	45
Wind speed (mph)	4.5	4.0	4.3	4.4	4.4	4.2

30-year delta table (1991–2020 minus 1981–2010, °F)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Δ Max temp	+0.4	+0.1	+1.2	+0.3	-0.3	+0.3	+0.4	+0.7	+0.6	+0.7	+1.0	+0.2
Δ Avg temp	+0.4	+0.2	+1.1	+0.5	-0.1	+0.6	+0.7	+0.8	+0.8	+0.7	+1.0	+0.4
Δ Min temp	+0.4	+0.3	+1.0	+0.6	+0.1	+0.9	+1.0	+0.9	+1.2	+0.8	+1.0	+0.5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Δ Max temp	+0.4	+0.1	+1.2	+0.3	-0.3	+0.3
Δ Avg temp	+0.4	+0.2	+1.1	+0.5	-0.1	+0.6
Δ Min temp	+0.4	+0.3	+1.0	+0.6	+0.1	+0.9

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Δ Max temp	+0.4	+0.7	+0.6	+0.7	+1.0	+0.2
Δ Avg temp	+0.7	+0.8	+0.8	+0.7	+1.0	+0.4
Δ Min temp	+1.0	+0.9	+1.2	+0.8	+1.0	+0.5

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Phoenix AP (NOAA GHCN station USW00023183), about 7 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 →