St. Johns, AZ Weather & Growing Conditions
This Afternoon
80°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 5pm, then a slight chance of showers and thunderstorms. Mostly sunny. High near 80, with temperatures falling to around 74 in the afternoon. South wind around 9 mph. Chance of precipitation is 60%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 80°F | Showers And Thunderstorms Likely | 9 mph S | 58% |
| Tonight | 54°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 8 mph SE | 12% |
| Saturday | 81°F | Slight Chance Showers And Thunderstorms | 6 to 14 mph SW | 10% |
| Saturday Night | 49°F | Mostly Clear | 6 to 10 mph S | 2% |
| Sunday | 80°F | Sunny | 6 to 10 mph W | 0% |
| Sunday Night | 52°F | Mostly Cloudy | 7 mph S | 0% |
| Monday | 80°F | Partly Sunny | 5 to 8 mph S | 0% |
| Monday Night | 54°F | Partly Cloudy then Slight Chance Rain Showers | 5 to 12 mph S | 20% |
| Tuesday | 78°F | Showers And Thunderstorms Likely | 9 to 14 mph S | 69% |
| Tuesday Night | 54°F | Chance Showers And Thunderstorms | 9 to 21 mph SE | 50% |
| Wednesday | 76°F | Chance Showers And Thunderstorms | 6 to 18 mph SE | 46% |
| Wednesday Night | 54°F | Chance Showers And Thunderstorms | 8 to 16 mph SE | 33% |
| Thursday | 76°F | Chance Showers And Thunderstorms | 8 to 13 mph SE | 44% |
| Thursday Night | 55°F | Chance Showers And Thunderstorms | 9 to 15 mph SE | 37% |
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 Sep 19, 2026.