St. Johns, AZ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Johns, a city in Apache County, Arizona.
Overnight
68°F
Mostly Clear
Mostly clear. Low around 68, with temperatures rising to around 70 overnight. West wind around 5 mph.
7-day forecast for St. Johns
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 68°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 99°F | Sunny | 3 to 14 mph W | 6% |
| Tuesday Night | 68°F | Mostly Clear | 5 to 14 mph SW | 6% |
| Wednesday | 97°F | Sunny | 3 to 15 mph W | 6% |
| Wednesday Night | 67°F | Partly Cloudy | 3 to 15 mph SW | 4% |
| Thursday | 97°F | Slight Chance Showers And Thunderstorms | 0 to 12 mph W | 14% |
| Thursday Night | 65°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 to 13 mph SW | 11% |
| Friday | 97°F | Sunny | 2 to 10 mph NW | 7% |
| Friday Night | 65°F | Mostly Clear | 6 to 17 mph S | 7% |
| Saturday | 97°F | Sunny then Slight Chance Showers And Thunderstorms | 3 to 12 mph W | 15% |
| Saturday Night | 66°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 6 to 15 mph S | 15% |
| Sunday | 95°F | Chance Showers And Thunderstorms | 5 to 14 mph W | 40% |
| Sunday Night | 64°F | Chance Showers And Thunderstorms then Partly Cloudy | 5 to 14 mph SW | 40% |
| Monday | 93°F | Chance Showers And Thunderstorms | 5 to 17 mph W | 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
Nearby towns & communities
Alpine
Burnside
Chinle
Concho
Cornfields
Cottonwood
Del Muerto
Dennehotso
Eagar
Ganado
Greasewood
Greer
Houck
Klagetoh
Low Mountain
Lukachukai
Lupton
Many Farms
McNary
Nazlini
Nutrioso
Oak Springs
Red Mesa
Red Rock
Rock Point
Rough Rock
Round Rock
Sanders
Sawmill
Sehili
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 Aug 4, 2026.