Climate averages 1991–2020
Flagstaff weather
in April.
A mild, fairly dry month: the 7th warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in Flagstaff: daytime highs average 15.0°C and nights cool to about 2.8°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 31 mm of rain on roughly 6 days, which makes April a fairly dry month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 03 min on an average April day.
The nearest other city in this atlas is Surprise (185 km away). In April its highs average 28.8°C, 13.8°C warmer than Flagstaff, with 8.6 mm of rain.
Among the 498 cities listed in the United States, Flagstaff ranks joint 361st of 498 for the warmest April highs and joint 88th of 498 for the driest April (rainfall, lowest first). The mean April high of those 498 cities is 19.4°C; Flagstaff is 4.4°C cooler than that mean.
From April to May, average highs rise by 5.5°C to 20.5°C, and monthly rainfall rises from 31 mm to 32 mm.
The annual picture
April in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Flagstaff climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 5.7°C-3.8°C | -3.8°C | 47 | 6.3 | 10.110 h |
| February | 7.0°C-3.0°C | -3.0°C | 50 | 6.9 | 10.911 h |
| March | 10.7°C-0.3°C | -0.3°C | 49 | 7.3 | 11.912 h |
| April, selected | 15.0°C2.8°C | 2.8°C | 31 | 5.6 | 13.113 h |
| May | 20.5°C7.7°C | 7.7°C | 32 | 5.7 | 14.014 h |
| June | 26.8°C13.2°C | 13.2°C | 11 | 3.0 | 14.514 h |
| July | 27.9°C15.9°C | 15.9°C | 115 | 14.7 | 14.314 h |
| August | 26.2°C15.2°C | 15.2°C | 126 | 16.3 | 13.513 h |
| September | 23.3°C12.4°C | 12.4°C | 57 | 8.8 | 12.412 h |
| October | 17.7°C6.9°C | 6.9°C | 33 | 5.2 | 11.311 h |
| November | 11.2°C1.0°C | 1.0°C | 32 | 4.1 | 10.410 h |
| December | 5.7°C-3.6°C | -3.6°C | 41 | 5.8 | 9.810 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
April in nearby cities
- Surprise in AprilUnited States · 185 kmHigh 28.8°C · Low 13.6°C · 8.6 mm rain
- Peoria (Arizona), United States in AprilUnited States · 188 kmHigh 28.7°C · Low 13.5°C · 6.9 mm rain
- Scottsdale in AprilUnited States · 189 kmHigh 28.7°C · Low 12.9°C · 8.0 mm rain
- Glendale (Arizona), United States in AprilUnited States · 191 kmHigh 29.0°C · Low 13.6°C · 6.9 mm rain
- Mesa in AprilUnited States · 198 kmHigh 28.8°C · Low 12.5°C · 9.4 mm rain
- Phoenix in AprilUnited States · 198 kmHigh 29.1°C · Low 13.4°C · 8.0 mm rain
- Tempe in AprilUnited States · 200 kmHigh 29.0°C · Low 13.0°C · 8.0 mm rain
- Avondale in AprilUnited States · 206 kmHigh 29.5°C · Low 14.2°C · 6.9 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Flagstaff) is explained once on the Flagstaff year overview and on the Sources, method and limits page.