Flagstaff, AZ Weather
Flagstaff hourly forecast: next 24 hours
Today's high of 66°F (19°C) is about 14°F (8°C) below the typical August high of 80°F (27°C).
Current conditions in detail
Flagstaff weather tomorrow (Monday, August 17)
Tomorrow in Flagstaff looks patchy rain nearby, with a high of 58° and an overnight low of 52°. There is a 78% chance of rain - plan accordingly. Winds top out near 30 mph, and the UV index reaches 11 (extreme).
Flagstaff 14-day forecast
About the weather in 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.
Flagstaff weather: 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.
Season by season
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.
Average temperatures in Flagstaff by month
| 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% |