St. Johns, AZ Weather & Growing Conditions
Today
66°F
Sunny
Sunny. High near 66, with temperatures falling to around 59 in the afternoon. Southwest wind 5 to 22 mph, with gusts as high as 37 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 66°F | Sunny | 5 to 22 mph SW | 2% |
| Tonight | 34°F | Mostly Clear | 3 to 12 mph SW | 2% |
| Thursday | 63°F | Sunny | 6 mph E | 0% |
| Thursday Night | 36°F | Partly Cloudy | 5 mph SW | 0% |
| Friday | 63°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 7 mph NE | 12% |
| Friday Night | 36°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 6 mph SW | 12% |
| Saturday | 64°F | Sunny | 3 to 8 mph NE | 2% |
| Saturday Night | 32°F | Clear | 6 to 9 mph E | 0% |
| Sunday | 66°F | Sunny | 5 to 12 mph NE | 0% |
| Sunday Night | 33°F | Mostly Clear | 7 mph E | 0% |
| Monday | 66°F | Mostly Sunny | 5 mph NE | 2% |
| Monday Night | 34°F | Partly Cloudy | 3 mph S | 3% |
| Tuesday | 63°F | Mostly Sunny | 5 mph S | 4% |
| Tuesday Night | 35°F | Partly Cloudy | 3 mph S | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Johns, AZ
Last spring frost
May 3
First fall frost
Oct 10
Growing season
160 days
Hardiness zone
6b
Explore more for St. Johns, AZ: full frost dates · planting calendar · Arizona frost dates
Climate data from the nearest NOAA station, St Johns Industrial Ap, Az (7.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.