San Tan Valley, AZ weather in May
In May, San Tan Valley sees highs around 95°F and lows around 59°F: hot and dry. Expect about 1 wet day. Plan outdoor time for mornings and evenings.
- Normal high
- 95°F
- Normal low
- 59°F
- Wet days
- 1
- 0.2 in total
- Muggy days
- 0
- dew point 65°F+
How May changes from start to finish
| May 1 | May 31 | |
|---|---|---|
| Normal high | 90°F | 101°F |
| Normal low | 55°F | 63°F |
| Chance of a wet day | 4% | 4% |
| Sunrise / sunset | 5:38 am / 7:08 pm | 5:18 am / 7:29 pm |
| Daylight | 13.5 h | 14.2 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 am70°Fdew point 37°F
- 9 am79°Fdew point 36°F
- Noon88°Fdew point 33°F
- 3 pm93°Fdew point 31°F
- 6 pm92°Fdew point 31°F
- 9 pm86°Fdew point 32°F
NOAA hourly normals (local standard time) from Phoenix Sky Harbor Intl Airport (32 mi away); average wind 7 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F1 of 31
- Hot dayshigh 90°F or more25 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow1 of 31
- Notable rainat least 0.10 in1 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per May, counted from daily records for each year 1991-2020.
Rain in May
Normal precipitation is 0.2 in; a dry May brings about 0.0 in and a wet one about 0.2 in (25th and 75th percentiles). Days with half an inch or more are rare.
How May varies from year to year
- Warmest May, 1991-20202000: average high 103°F
- Coolest May2019: average high 87°F
- Wettest May1992: 1.5 in
- Driest May1991: no measurable precipitation
- Highest reading116°F (May 13, 1996)
- Lowest reading35°F (May 3, 2010)
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 | 86°F | 95°F | 105°F |
| Normal low | 51°F | 59°F | 68°F |
| Wet days | 1 | 1 | 1 |
| Comfortable days | 7 | 1 | 0 |
| Daylight | 13.0 h | 13.9 h | 14.3 h |
Highs change by +9°F from April and +10°F into June.
Nearby alternatives in May
- Cooler: Sedona, AZ117 mi · high 84°F · 3 wet days
How San Tan Valley ranks in May
- Normal high3rd warmest of 378 cities; 1st of 13 in Arizona
- Wet days14th driest of 378
- Comfortable days314th most of 339
What to pack for San Tan Valley in May
- Light, breathable clothing – highs near 95°F
- Layers – afternoons near 95°F but nights near 59°F
Heating and cooling
May has 4 heating degree days and 382 cooling degree days (base 65°F), 7% of the year's total heating and cooling demand.
Questions
How hot is San Tan Valley in May?
The normal high is 95°F and the normal low is 59°F. From 1991 to 2020 the hottest May reading was 116°F (May 13, 1996).
Does it rain a lot in San Tan Valley in May?
About 1 days in May have at least 0.01 in of precipitation, and the normal total is 0.2 in. The wettest May in 1991-2020 was in 1992 (1.5 in); the driest was in 1991, with no measurable precipitation.
Is May a good time to visit San Tan Valley?
May ranks 7th of 12 months on our comfort score for San Tan Valley (42 out of 100). It has about 1 comfortable day and about 25 days at 90°F or hotter. The best months are January, February and December.
Where the numbers come from
- Temperature, rain, snowfall and snow depth: Casa Grande Nm (USC00021314), 14 mi S of the city center, 1,419 ft (103 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Frost dates: Chandler Heights (USC00021514), 9.0 mi W of the city center, 1,425 ft (97 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Phoenix Sky Harbor Intl Airport (USW00023183), 32 mi WNW of the city center, 1,107 ft (415 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Phoenix Sky Harbor Intl Airport (722780-23183), 32 mi WNW of the city center, 1,113 ft (409 ft lower than the city). Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).