San Tan Valley, Arizona, gets 10 inches of rain per year. The US average is 39. Snowfall is 0 inches. The average US city gets 26 inches of snow per year. The number of days with any measurable precipitation is 20.
On average, there are 292 sunny days per year in San Tan Valley, Arizona. The July high is around 105 degrees. The January low is 41. Sperling's comfort index for San Tan Valley is a 75 out of 100, where a higher score indicates a more comfortable year-around climate. The US average for the comfort index is 54. Our index is based on the total number of days annually within the comfort range of 70-80 degrees, and we also applied a penalty for days of excessive humidity.
Did You Know?
- The highest monthly average temperature in San Tan Valley for July is 94 degrees.
- The lowest monthly average temperature in San Tan Valley for December is 52 degrees.
- The most monthly precipitation in San Tan Valley occurs in January with 0 inches.
- The air quality index in San Tan Valley is 49% worse than the national average.
- The pollution index in San Tan Valley is 20% better than the national average.
San Tan Valley Average Weather
| Date | Average Low |
Average High |
Record Low |
Record High |
Average Precipitation |
| January | 39° | 64° | 14° (1971) | 86° (1971) | 0.95" |
| February | 42° | 69° | 20° (1985) | 90° (1957) | 1.08" |
| March | 46° | 75° | 23° (1971) | 97° (1988) | 1.27" |
| April | 51° | 84° | 32° (1975) | 102° (1992) | 0.38" |
| May | 60° | 92° | 34° (1959) | 112° (1983) | 0.19" |
| June | 69° | 102° | 50° (1950) | 117° (1990) | 0.05" |
| July | 76° | 104° | 59° (1974) | 116° (1995) | 0.89" |
| August | 74° | 101° | 54° (1975) | 115° (1972) | 1.31" |
| September | 69° | 97° | 47° (1985) | 111° (1948) | 0.76" |
| October | 57° | 86° | 29° (1971) | 107° (1980) | 0.77" |
| November | 45° | 72° | 22° (1956) | 93° (1962) | 0.95" |
| December | 39° | 63° | 19° (1974) | 83° (1981) | 1.08" |
