St. Johns, AZ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Johns, a city in Apache County, Arizona.
This Afternoon
79°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 5pm, then a slight chance of showers and thunderstorms. Partly sunny. High near 79, with temperatures falling to around 74 in the afternoon. South wind around 10 mph. Chance of precipitation is 60%.
7-day forecast for St. Johns
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 79°F | Showers And Thunderstorms Likely | 10 mph S | 62% |
| Tonight | 54°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 3 to 8 mph S | 11% |
| Saturday | 81°F | Sunny | 3 to 16 mph W | 9% |
| Saturday Night | 49°F | Mostly Clear | 5 to 13 mph S | 2% |
| Sunday | 79°F | Sunny | 5 to 13 mph SW | 0% |
| Sunday Night | 52°F | Mostly Cloudy | 5 to 8 mph S | 0% |
| Monday | 79°F | Partly Sunny | 8 mph SW | 1% |
| Monday Night | 54°F | Partly Cloudy then Slight Chance Rain Showers | 5 to 8 mph S | 22% |
| Tuesday | 77°F | Showers And Thunderstorms Likely | 9 to 14 mph SE | 68% |
| Tuesday Night | 55°F | Chance Showers And Thunderstorms | 9 to 17 mph SE | 52% |
| Wednesday | 75°F | Chance Showers And Thunderstorms | 5 to 14 mph SE | 50% |
| Wednesday Night | 54°F | Chance Showers And Thunderstorms | 6 to 9 mph SE | 34% |
| Thursday | 75°F | Chance Showers And Thunderstorms | 8 mph SE | 47% |
| Thursday Night | 55°F | Chance Showers And Thunderstorms | 7 to 10 mph SE | 39% |
Forecast source: National Weather Service (api.weather.gov) for St. Johns (34.500, -109.377). Updated through the day.
Growing snapshot for St. Johns
Last spring frost
May 3
First fall frost
Oct 10
Growing season
160 days
Hardiness zone
6b
More local growing data for St. Johns: nearby ZIP 85936 weather · frost dates · planting calendar · Arizona frost dates
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Climate data from the nearest NOAA station, St Johns Industrial Ap, Az (7.2 mi from St. Johns). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.