Flagstaff, Arizona Weather
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Climate of Flagstaff: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Flagstaff, with average daytime highs around 31°C. December is the coolest, when nights typically fall to about -5°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 36°C, so the seasons feel very different from each other.
The area receives about 460 mm of rain in a typical year. Rainfall is modest in every month; July is the wettest at about 69 mm. The driest stretch is April to June, with under 20 mm a month.
For outdoor plans and travel, May to September usually offer the most comfortable weather in Flagstaff, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 8° | -5° | 47 mm | 62% |
| Feb | 9° | -4° | 48 mm | 60% |
| Mar | 14° | -1° | 33 mm | 51% |
| Apr | 19° | 2° | 18 mm | 42% |
| May | 24° | 7° | 15 mm | 36% |
| Jun | 31° | 12° | 6 mm | 26% |
| Jul | 31° | 16° | 69 mm | 46% |
| Aug | 30° | 15° | 68 mm | 51% |
| Sep | 27° | 11° | 37 mm | 46% |
| Oct | 20° | 5° | 31 mm | 46% |
| Nov | 13° | -1° | 33 mm | 51% |
| Dec | 7° | -5° | 51 mm | 62% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Flagstaff. Values describe typical conditions, not a forecast.
About Flagstaff weather
Flagstaff, in Arizona's mostly desert climate, with cooler high country in the north, is positioned about 198 km north of Phoenix. The warmer months mean extremely hot summers (May–September) with highs regularly above 40°C in the low deserts. Finally, there's mild, dry winters in the desert, cold with snow in the northern highlands. This page shows live, auto-refreshing weather for Flagstaff: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Phoenix.
Frequently asked questions
Flagstaff is about 198 km north of Phoenix, in Arizona.
Flagstaff sees mild, dry winters in the desert, cold with snow in the northern highlands.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Flagstaff's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Flagstaff, with average daytime highs of about 31°C and nights around 16°C.
The coldest nights come in December, when the average low is about -5°C and daytime highs reach around 7°C. Frost is possible on clear, calm nights.
Flagstaff receives about 460 mm of rain in a typical year. July is the wettest month at roughly 69 mm; no month averages more than 100 mm.
May to September usually offer the most comfortable weather in Flagstaff, with mild daytime temperatures and little rain.
In November Flagstaff typically sees daytime highs near 13°C and lows near -1°C, with about 33 mm of rain over the month and average humidity around 51%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
The current temperature for Flagstaff updates automatically at the top of this page — scroll to the hourly strip below to see how it's expected to change over the day.
Flagstaff's day-to-day weather follows the broader pattern of Arizona described above. See the hourly weather forecast or the air quality index for more detail.