Flagstaff, AZ weather in May
In May, Flagstaff sees highs around 68°F and lows around 35°F: mild and mostly dry. Rain or snow falls on about 5 days. Snowfall averages about 1.1 in. Great for outdoor plans.
- Normal high
- 68°F
- Normal low
- 35°F
- Wet days
- 5
- 0.8 in total
- Snowfall
- 1.1 in
- normal snowfall
How May changes from start to finish
| May 1 | May 31 | |
|---|---|---|
| Normal high | 63°F | 74°F |
| Normal low | 31°F | 38°F |
| Chance of a wet day | 15% | 12% |
| Sunrise / sunset | 5:35 am / 7:12 pm | 5:13 am / 7:35 pm |
| Daylight | 13.6 h | 14.4 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Arizona time (no daylight saving)).
A typical May day
- 6 am36°Fdew point 24°F
- 9 am60°Fdew point 27°F
- Noon66°Fdew point 25°F
- 3 pm68°Fdew point 24°F
- 6 pm66°Fdew point 23°F
- 9 pm50°Fdew point 23°F
NOAA hourly normals (local standard time) from Grand Canyon NP Airport (59 mi away); average wind 7 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F (temperature only: no humidity station nearby)20 of 31
- Hot dayshigh 90°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow5 of 31
- Notable rainat least 0.10 in2 of 31
- Freezing nightslow 32°F or below12 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per May, counted from daily records for each year 1991-2020.
Rain and snow in May
Normal precipitation is 0.8 in; a dry May brings about 0.1 in and a wet one about 1.0 in (25th and 75th percentiles). Days with half an inch or more are rare. Normal snowfall is 1.1 in.
How May varies from year to year
- Warmest May, 1991-20202000: average high 74°F
- Coolest May2019: average high 59°F
- Wettest May1992: 4.1 in
- Driest May1996: no measurable precipitation
- Highest reading89°F (May 31, 2002)
- Lowest reading19°F (May 3, 2011)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
May compared with April and June
| April | May | June | |
|---|---|---|---|
| Normal high | 59°F | 68°F | 79°F |
| Normal low | 28°F | 35°F | 43°F |
| Wet days | 5 | 5 | 2 |
| Comfortable days | 9 | 20 | 15 |
| Daylight | 13.1 h | 14.0 h | 14.5 h |
Highs change by +9°F from April and +11°F into June.
Nearby alternatives in May
- Warmer: Sedona, AZ24 mi · high 84°F · 3 wet days
- Drier: Peoria, AZ117 mi · high 93°F · 1 wet day
How Flagstaff ranks in May
- Normal high299th warmest of 378 cities; 13th of 13 in Arizona
- Wet days77th driest of 378
What to pack for Flagstaff in May
- A warm jacket – lows near 35°F, highs near 68°F
- Layers – afternoons near 68°F but nights near 35°F
Heating and cooling
May has 424 heating degree days and 1 cooling degree days (base 65°F), 6% of the year's total heating and cooling demand.
Questions
How cold is Flagstaff in May?
The normal high is 68°F and the normal low is 35°F. From 1991 to 2020 the coldest May reading was 19°F (most recently on May 3, 2011).
Does it rain a lot in Flagstaff in May?
About 5 days in May have at least 0.01 in of precipitation, and the normal total is 0.8 in. The wettest May in 1991-2020 was in 1992 (4.1 in); the driest was in 1996, with no measurable precipitation.
Does it snow in Flagstaff in May?
Yes. Normal snowfall in May is 1.1 in.
Is May a good time to visit Flagstaff?
May ranks 1st of 12 months on our comfort score for Flagstaff (82 out of 100). It has about 20 comfortable days (judged by temperature only). The best months are May and September.
Where the numbers come from
- Temperature, rain, snowfall and frost dates: Flagstaff Pulliam Airport (USW00003103), 3.8 mi SSW of the city center, 7,003 ft (103 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Snow depth: Sunset Crater Nm (USC00028329), 13 mi NNE of the city center, 6,980 ft (80 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Grand Canyon NP Airport (USW00003195), 59 mi NNW of the city center, 6,606 ft (294 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Not available for this location: cloud cover and daily humidity and wind (no station close enough or similar enough in elevation).