Flagstaff weather in May: Flagstaff, Arizona: normal highs, lows, rain and records for May
Flagstaff in May has a normal high of 68°F and a normal low of 35°F, a daily mean of 51°F, rising from 63°F on the 1st to 74°F by the 31st. Measurable precipitation falls on 5 days in a normal May, 0.77 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 20°C and low of 1°C, 20 mm of precipitation and 3 cm of snow in May.
- NOAA stationFlagstaff Airport
- Station IDUSW00003103
- Location35.14°N 111.67°W
- Elevation7,003 ft (2,135 m)
- Population77,539
- Jan 43° 18°
- Feb 46° 20°
- Mar 52° 24°
- Apr 59° 28°
- May 68° 35°
- Jun 79° 43°
- Jul 82° 51°
- Aug 79° 51°
- Sep 74° 43°
- Oct 64° 32°
- Nov 52° 23°
- Dec 43° 17°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Flagstaff in May?
The normal high is 68°F and the normal low 35°F, for a daily mean of 51.3°F. May is 7.6°F warmer than April and 9.5°F cooler than June. May is the 5th warmest month of the year in Flagstaff and the 11th wettest. Across the month the normal high rises 11°F, from 63°F on May 1 to 74°F on May 31. From one year to the next May's mean temperature typically moves about 3.0°F either way (NOAA's standard deviation), so roughly two Mays in three average between 48°F and 54°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 15%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 63°F | 31°F | 15% | 6% |
| May 8 | 65°F | 33°F | 14% | 6% |
| May 15 | 68°F | 34°F | 14% | 6% |
| May 22 | 70°F | 36°F | 13% | 6% |
| May 31 | 74°F | 38°F | 11% | 5% |
Every day of May: normal high, low and chance of precipitation (warmest afternoon May 31, coldest night May 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| May 1 | 63°F | 31°F | 15% | 6% | 13 h 30 min |
| May 2 | 63°F | 32°F | 15% | 6% | 13 h 40 min |
| May 3 | 63°F | 32°F | 15% | 6% | 13 h 40 min |
| May 4 | 64°F | 32°F | 15% | 6% | 13 h 40 min |
| May 5 | 64°F | 32°F | 15% | 6% | 13 h 40 min |
| May 6 | 64°F | 33°F | 14% | 6% | 13 h 40 min |
| May 7 | 65°F | 33°F | 14% | 6% | 13 h 50 min |
| May 8 | 65°F | 33°F | 14% | 6% | 13 h 50 min |
| May 9 | 65°F | 33°F | 14% | 6% | 13 h 50 min |
| May 10 | 66°F | 33°F | 14% | 6% | 13 h 50 min |
| May 11 | 66°F | 34°F | 14% | 6% | 13 h 50 min |
| May 12 | 66°F | 34°F | 14% | 6% | 13 h 50 min |
| May 13 | 67°F | 34°F | 14% | 6% | 14 h |
| May 14 | 67°F | 34°F | 14% | 6% | 14 h |
| May 15 | 68°F | 34°F | 14% | 6% | 14 h |
| May 16 | 68°F | 35°F | 14% | 6% | 14 h |
| May 17 | 68°F | 35°F | 14% | 6% | 14 h |
| May 18 | 69°F | 35°F | 14% | 6% | 14 h |
| May 19 | 69°F | 35°F | 14% | 6% | 14 h 10 min |
| May 20 | 70°F | 35°F | 13% | 6% | 14 h 10 min |
| May 21 | 70°F | 36°F | 13% | 6% | 14 h 10 min |
| May 22 | 70°F | 36°F | 13% | 6% | 14 h 10 min |
| May 23 | 71°F | 36°F | 13% | 6% | 14 h 10 min |
| May 24 | 71°F | 36°F | 12% | 6% | 14 h 10 min |
| May 25 | 72°F | 37°F | 12% | 6% | 14 h 10 min |
| May 26 | 72°F | 37°F | 12% | 6% | 14 h 10 min |
| May 27 | 72°F | 37°F | 12% | 6% | 14 h 20 min |
| May 28 | 73°F | 37°F | 12% | 6% | 14 h 20 min |
| May 29 | 73°F | 37°F | 11% | 5% | 14 h 20 min |
| May 30 | 74°F | 38°F | 11% | 5% | 14 h 20 min |
| May 31 | 74°F | 38°F | 11% | 5% | 14 h 20 min |
- Normal high
- 68°FMay average
- Normal low
- 35°FMay average
- Precipitation
- 0.77 inmonth total
- Days with precipitation
- 50.01 inch or more
- Snowfall
- 1.1 inmonth total
- Nights at 32°F or colder
- 12
- Daylight
- 13 h 30 min to 14 h 20 minMay 1 to May 31
- Days at 70°F or more
- 15
- Days at 80°F or more
- 2
- Sunshine
- 89%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00003103; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Flagstaff in May?
On a given May day the chance of 0.01 inch or more is 13% on average, highest around May 1 (15%). In all, 0.77 in falls on 5 days of a normal May.
In a normal May in Flagstaff, 12 nights fall to freezing and snowfall averages 1.1 inches.
Snow falls on 1 day in a normal May.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00003103.
What are the records for May in Flagstaff?
The warmest May temperature on Flagstaff's official record (since 1898) is 89°F, on May 31, 2002; the coldest is 7°F, on May 3, 1915. The wettest May brought 4.14 in (1992); the snowiest, 15.0 inches (1904).
The May mean against the 1991-2020 normal of 51.3°F: 2021 51.7°F (+0.4), 2022 53.6°F (+2.3), 2023 51.6°F (+0.3), 2024 51.8°F (+0.5), 2025 52.6°F (+1.3), 2026 52.6°F (+1.3). 6 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 51.7°F | +0.4°F | 0.52 in |
| 2022 | 53.6°F | +2.3°F | 0.00 in |
| 2023 | 51.6°F | +0.3°F | 1.26 in |
| 2024 | 51.8°F | +0.5°F | 0.01 in |
| 2025 | 52.6°F | +1.3°F | 0.37 in |
| 2026 | 52.6°F | +1.3°F | 0.26 in |
Source: records: ACIS, NWS threaded record FLGthr; recent months: ACIS, station USW00003103. Records and recent months use complete months only.
How does May in Flagstaff compare across Arizona?
Across the 97 places PlainClimate covers in Arizona, May normal highs run from 66°F in Greer to 98°F in Gila Bend; Flagstaff's is 68°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.