Phoenix, AZ Climate & Monthly Averages
The climate of Phoenix
Weather in Phoenix is shaped by its semi-arid climate - expect big day-to-night temperature swings and modest rainfall. July afternoons typically reach 106°F (41°C), while January highs hover near 65°F (18°C). Annual precipitation averages 11.1 inches (282 mm) over about 34 rainy days.
Climate quick facts
- Hottest month: July - highs near 106°F (41°C)
- Coldest month: January - highs near 65°F (18°C)
- Record high: 118°F (48°C) · Record low: 28°F (-2°C) (2015–2024)
- Wettest month: July (5 rainy days) · Sunniest: June (13.2 h sun/day)
- Climate type: semi-arid - big day-to-night temperature swings and modest rainfall
Temperatures through the year
The warmest stretch of the year centers on July. Highs average 106°F (41°C) and overnight lows stay near 84°F (29°C). The coolest month is January, with typical highs of 65°F (18°C) and lows around 42°F (6°C). Based on 2015–2024 weather data, temperatures have reached as high as 118°F (48°C) and dropped as low as 28°F (-2°C).
Rain, sun and snow
July is usually the wettest month. It brings about 1.9 inches (49 mm) of rain over 5 days, while May is the driest. June brings the most sunshine, averaging 13.2 hours of sun a day.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 65° | 42° | 4 | 1.3 in | 8.5 h/day | 55% |
| February | 70° | 45° | 3 | 1.2 in | 9.7 h/day | 46% |
| March | 77° | 51° | 3 | 1.1 in | 10.6 h/day | 37% |
| April | 87° | 59° | 1 | 0.2 in | 12.5 h/day | 21% |
| May | 93° | 67° | 1 | 0.1 in | 12.9 h/day | 19% |
| June | 105° | 78° | 1 | 0.2 in | 13.2 h/day | 17% |
| July | 106° | 84° | 5 | 1.9 in | 12.1 h/day | 31% |
| August | 104° | 83° | 5 | 1.4 in | 12.2 h/day | 35% |
| September | 100° | 76° | 3 | 0.9 in | 11.4 h/day | 33% |
| October | 89° | 64° | 2 | 1.0 in | 10.5 h/day | 32% |
| November | 76° | 51° | 2 | 0.6 in | 9.4 h/day | 36% |
| December | 66° | 44° | 4 | 1.3 in | 8.2 h/day | 50% |
Phoenix month by month
Phoenix weather in January
January brings highs around 65°F (18°C), lows near 42°F (6°C), about 4 wet days - typically the coldest month of the year in Phoenix.
Phoenix weather in February
February brings highs around 70°F (21°C), lows near 45°F (7°C), about 3 wet days.
Phoenix weather in March
March brings highs around 77°F (25°C), lows near 51°F (10°C), about 3 wet days.
Phoenix weather in April
April brings highs around 87°F (30°C), lows near 59°F (15°C), about 1 wet days.
Phoenix weather in May
May brings highs around 93°F (34°C), lows near 67°F (20°C), about 1 wet days - typically the driest month of the year in Phoenix.
Phoenix weather in June
June brings highs around 105°F (40°C), lows near 78°F (26°C), about 1 wet days - typically the sunniest month of the year in Phoenix.
Phoenix weather in July
July brings highs around 106°F (41°C), lows near 84°F (29°C), about 5 wet days - typically the hottest month and the wettest month of the year in Phoenix.
Phoenix weather in August
August brings highs around 104°F (40°C), lows near 83°F (28°C), about 5 wet days.
Phoenix weather in September
September brings highs around 100°F (38°C), lows near 76°F (25°C), about 3 wet days.
Phoenix weather in October
October brings highs around 89°F (32°C), lows near 64°F (18°C), about 2 wet days.
Phoenix weather in November
November brings highs around 76°F (25°C), lows near 51°F (11°C), about 2 wet days.
Phoenix weather in December
December brings highs around 66°F (19°C), lows near 44°F (6°C), about 4 wet days.
Seasons in Phoenix
Spring (March through May)
Spring in Phoenix is hot, with daytime highs averaging 86°F (30°C) and nights around 59°F (15°C); precipitation is infrequent.
Summer (June through August)
Summer in Phoenix brings serious heat, with daytime highs averaging 105°F (41°C) and nights around 82°F (28°C); rain falls on about 11 days over the three months.
Fall (September through November)
Fall in Phoenix brings hot afternoons, with daytime highs averaging 88°F (31°C) and nights around 64°F (18°C); precipitation is infrequent.
Winter (December through February)
Winter in Phoenix is mild, with daytime highs averaging 67°F (20°C) and nights around 44°F (6°C); rain falls on about 11 days over the three months.
Climate questions, answered
What is the average temperature in Phoenix?
Is Phoenix hot in summer?
Is Phoenix cold in winter?
How many rainy days does Phoenix get in a year?
Best time to visit Phoenix
The best time to visit Phoenix is generally November to March, when temperatures are at their most comfortable before or after the peak heat. Daytime temperatures in that window typically sit near 71°F (22°C).
Pack for Phoenix with lightweight, breathable clothing and strong sun protection for the hot months. Evenings can feel noticeably cooler than afternoons - July nights average 84°F (29°C).
Phoenix temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.