Flagstaff, AZ Climate & Monthly Averages
The climate of Flagstaff
Located in Arizona, United States, Flagstaff experiences a semi-arid climate with big day-to-night temperature swings and modest rainfall. Afternoon temperatures peak near 83°F (29°C) in July and dip to about 40°F (5°C) in January, with around 18.4 inches (467 mm) of precipitation falling across the year.
Climate quick facts
- Hottest month: July - highs near 83°F (29°C)
- Coldest month: January - highs near 40°F (5°C)
- Record high: 96°F (36°C) · Record low: -4°F (-20°C) (2015–2024)
- Wettest month: July (12 rainy days) · Sunniest: June (13.7 h sun/day)
- Climate type: semi-arid - big day-to-night temperature swings and modest rainfall
- Snow: about 23 days a year
Temperatures through the year
The warmest stretch of the year centers on July. Highs average 83°F (29°C) and overnight lows stay near 60°F (16°C). The coolest month is January, with typical highs of 40°F (5°C) and lows around 23°F (-5°C). Based on 2015–2024 weather data, temperatures have reached as high as 96°F (36°C) and dropped as low as -4°F (-20°C).
Rain, sun and snow
July is usually the wettest month. It brings about 2.6 inches (66 mm) of rain over 12 days, while June is the driest. June brings the most sunshine, averaging 13.7 hours of sun a day. Snow falls on about 23 days in a typical year, mostly from October through May.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 40° | 23° | 8 | 2.0 in | 8.4 h/day | 66% |
| February | 44° | 25° | 6 | 1.9 in | 9.7 h/day | 58% |
| March | 49° | 29° | 8 | 2.1 in | 10.5 h/day | 57% |
| April | 61° | 36° | 4 | 0.6 in | 12.4 h/day | 39% |
| May | 68° | 43° | 6 | 1.2 in | 12.9 h/day | 36% |
| June | 81° | 56° | 3 | 0.6 in | 13.7 h/day | 27% |
| July | 83° | 60° | 12 | 2.6 in | 12.5 h/day | 43% |
| August | 80° | 58° | 11 | 2.4 in | 12.2 h/day | 50% |
| September | 75° | 53° | 6 | 1.3 in | 11.6 h/day | 45% |
| October | 64° | 43° | 6 | 1.2 in | 10.5 h/day | 47% |
| November | 52° | 33° | 3 | 1.1 in | 9.4 h/day | 49% |
| December | 43° | 26° | 5 | 1.4 in | 8.3 h/day | 56% |
Flagstaff month by month
Flagstaff weather in January
January brings highs around 40°F (5°C), lows near 23°F (-5°C), about 8 wet days and roughly 5 snowy days - typically the coldest month of the year in Flagstaff.
Flagstaff weather in February
February brings highs around 44°F (7°C), lows near 25°F (-4°C), about 6 wet days and roughly 4 snowy days.
Flagstaff weather in March
March brings highs around 49°F (10°C), lows near 29°F (-1°C), about 8 wet days and roughly 5 snowy days.
Flagstaff weather in April
April brings highs around 61°F (16°C), lows near 36°F (2°C), about 4 wet days and roughly 1 snowy days.
Flagstaff weather in May
May brings highs around 68°F (20°C), lows near 43°F (6°C), about 6 wet days and roughly 1 snowy days.
Flagstaff weather in June
June brings highs around 81°F (27°C), lows near 56°F (13°C), about 3 wet days - typically the driest month and the sunniest month of the year in Flagstaff.
Flagstaff weather in July
July brings highs around 83°F (29°C), lows near 60°F (16°C), about 12 wet days - typically the hottest month and the wettest month of the year in Flagstaff.
Flagstaff weather in August
August brings highs around 80°F (27°C), lows near 58°F (15°C), about 11 wet days.
Flagstaff weather in September
September brings highs around 75°F (24°C), lows near 53°F (12°C), about 6 wet days.
Flagstaff weather in October
October brings highs around 64°F (18°C), lows near 43°F (6°C), about 6 wet days.
Flagstaff weather in November
November brings highs around 52°F (11°C), lows near 33°F (0°C), about 3 wet days and roughly 2 snowy days.
Flagstaff weather in December
December brings highs around 43°F (6°C), lows near 26°F (-3°C), about 5 wet days and roughly 3 snowy days.
Seasons in Flagstaff
Spring (March through May)
Spring in Flagstaff stays on the cool side of mild, with daytime highs averaging 59°F (15°C) and nights around 36°F (2°C); rain falls on about 18 days over the three months, plus around 7 snowy days.
Summer (June through August)
Summer in Flagstaff runs hot, with daytime highs averaging 82°F (28°C) and nights around 58°F (15°C); expect showers on roughly 26 days across the season.
Fall (September through November)
Fall in Flagstaff is crisp but comfortable, with daytime highs averaging 64°F (18°C) and nights around 43°F (6°C); rain falls on about 15 days over the three months, plus around 3 snowy days.
Winter (December through February)
Winter in Flagstaff runs cold, with daytime highs averaging 43°F (6°C) and nights around 24°F (-4°C); expect showers on roughly 19 days across the season, plus around 13 snowy days.
Climate questions, answered
What is the average temperature in Flagstaff?
Is Flagstaff hot in summer?
Is Flagstaff cold in winter?
How many rainy days does Flagstaff get in a year?
Best time to visit Flagstaff
The best time to visit Flagstaff is generally April to June and September to October, when temperatures are at their most comfortable before or after the peak heat. Daytime temperatures in that window typically sit near 70°F (21°C).
Pack for Flagstaff with a heavy insulated coat, hat and gloves for winter; rain gear if you travel around July. Evenings can feel noticeably cooler than afternoons - July nights average 60°F (16°C).
Flagstaff temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.