San Jose, AZ climate
San Jose has mild winters and hot summers, with very little rain. A typical July afternoon reaches 100°, a January night drops to 31°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in San Jose feels like
Winter
Spring
Summer
Fall
San Jose weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 62° | 31° | 0.7" | 0.2" | 5 | 0 | 42° – 52° |
| February | 67° | 35° | 0.7" | 0 | 4 | 0 | 46° – 56° |
| March | 74° | 40° | 0.4" | 0 | 3 | 0 | 50° – 62° |
| April | 82° | 46° | 0.2" | 0 | 2 | 0 | 59° – 69° |
| May | 91° | 54° | 0.2" | 0 | 2 | 0 | 67° – 77° |
| June | 100° | 64° | 0.2" | 0 | 2 | 0 | 77° – 86° |
| July | 100° | 71° | 1.5" | 0 | 8 | 0 | 82° – 88° |
| August | 97° | 70° | 1.8" | 0 | 8 | 0 | 80° – 89° |
| September | 93° | 63° | 1.0" | 0 | 4 | 0 | 74° – 81° |
| October | 84° | 50° | 0.7" | 0 | 4 | 0 | 64° – 73° |
| November | 71° | 38° | 0.5" | 0 | 3 | 0 | 47° – 62° |
| December | 61° | 31° | 0.8" | 0 | 5 | 0 | 42° – 49° |
| Year | 82° | 49° | 8.7" | 0.2" | 49 | 0 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in San Jose
San Jose gets 9 inches of rain and melted snow a year. August is the wettest month and May the driest. Rain or snow falls on about 49 days a year.
About 228 frost-free days a year
In half of years the last 32° night comes by March 25 and the first one by November 9. That leaves about 228 frost-free days for gardens, longer than 85% of U.S. towns.
Heating and cooling a home in San Jose
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In San Jose, 49% of that work is heating and 51% is cooling.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
How San Jose compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in San Jose averaged 1.3° warmer than the 1900s. The biggest change is in March (+2.1°). The shift is larger than in 58% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at San Jose’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. November swings the most: between 1991 and 2020 its average temperature ranged from 47° to 62°. July is the most reliable, staying within 6°.
Common questions about San Jose’s climate
What is the coldest month in San Jose?
December, with a typical high of 61° and a low of 31°.
What is the hottest month in San Jose?
June, with a typical high of 100° and a low of 64°. About 142 days a year reach 90°.
How much snow does San Jose get?
Almost none. A normal year brings 0.2 inches.
When is the first frost in San Jose?
In half of years the first 32° night comes by November 9, and the last spring frost by March 25.
What is the rainiest month in San Jose?
August, with 1.8 inches of rain and melted snow. The year totals 9 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for San Jose itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Safford Ag Ctr, AZ (5 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.