St. Johns, AZ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Johns, a community in Maricopa County, Arizona.
This Afternoon
75°F
Mostly Sunny
Mostly sunny. High near 75, with temperatures falling to around 73 in the afternoon. North northeast wind around 0 mph.
7-day forecast for St. Johns
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Mostly Sunny | 0 mph | 0% |
| Tonight | 54°F | Partly Cloudy | 0 mph | 0% |
| Wednesday | 77°F | Sunny | 0 to 5 mph SSW | 0% |
| Wednesday Night | 54°F | Clear | 0 mph | 0% |
| Thursday | 78°F | Sunny | 0 to 5 mph ENE | 0% |
| Thursday Night | 55°F | Partly Cloudy | 0 mph | 0% |
| Friday | 80°F | Sunny | 0 to 5 mph NNE | 0% |
| Friday Night | 56°F | Mostly Clear | 0 to 5 mph N | 0% |
| Saturday | 81°F | Sunny | 0 to 5 mph NE | 0% |
| Saturday Night | 57°F | Mostly Clear | 0 to 10 mph NE | 1% |
| Sunday | 82°F | Sunny | 5 to 15 mph E | 3% |
| Sunday Night | 57°F | Partly Cloudy | 5 to 10 mph E | 4% |
| Monday | 80°F | Mostly Sunny | 0 to 10 mph E | 5% |
| Monday Night | 57°F | Partly Cloudy | 0 to 5 mph ENE | 2% |
Forecast source: National Weather Service (api.weather.gov) for St. Johns (33.308, -112.197). Updated through the day.
Growing snapshot for St. Johns
Last spring frost
Jan 14
First fall frost
Dec 22
Growing season
343 days
Hardiness zone
9b
More local growing data for St. Johns: nearby ZIP 85339 weather · frost dates · planting calendar · Arizona frost dates
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Climate data from the nearest NOAA station, Laveen 3 Sse, Az (6.7 mi from St. Johns). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.