St. Johns, AZ Weather & Growing Conditions
Today
99°F
Sunny
Sunny. High near 99, with temperatures falling to around 96 in the afternoon. West wind 9 to 13 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 99°F | Sunny | 9 to 13 mph W | 6% |
| Tonight | 67°F | Mostly Clear | 5 to 13 mph SW | 6% |
| Wednesday | 97°F | Sunny | 3 to 14 mph W | 5% |
| Wednesday Night | 66°F | Partly Cloudy | 5 to 14 mph SW | 5% |
| Thursday | 97°F | Slight Chance Showers And Thunderstorms | 2 to 10 mph W | 12% |
| Thursday Night | 65°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 6 to 10 mph SW | 12% |
| Friday | 97°F | Sunny | 3 to 9 mph W | 7% |
| Friday Night | 65°F | Mostly Clear | 7 to 15 mph S | 7% |
| Saturday | 97°F | Sunny then Slight Chance Showers And Thunderstorms | 3 to 10 mph W | 16% |
| Saturday Night | 66°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 6 to 14 mph S | 16% |
| Sunday | 96°F | Chance Showers And Thunderstorms | 5 to 12 mph SW | 40% |
| Sunday Night | 64°F | Chance Showers And Thunderstorms then Partly Cloudy | 5 to 13 mph SW | 40% |
| Monday | 93°F | Chance Showers And Thunderstorms | 5 to 17 mph SW | 41% |
| Monday Night | 62°F | Chance Showers And Thunderstorms then Mostly Cloudy | 3 to 17 mph SW | 41% |
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 Aug 4, 2026.