St. George, UT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. George, a city in Washington County, Utah.
Tonight
66°F
Mostly Clear
Mostly clear. Low around 66, with temperatures rising to around 68 overnight. North northeast wind 1 to 6 mph.
7-day forecast for St. George
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 66°F | Mostly Clear | 1 to 6 mph NNE | 4% |
| Saturday | 90°F | Sunny | 1 to 5 mph NE | 0% |
| Saturday Night | 63°F | Mostly Clear | 1 to 6 mph N | 0% |
| Sunday | 91°F | Sunny | 1 mph NNE | 0% |
| Sunday Night | 67°F | Partly Cloudy | 2 mph N | 0% |
| Monday | 91°F | Mostly Sunny | 2 mph ESE | 5% |
| Monday Night | 66°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 3 mph N | 30% |
| Tuesday | 88°F | Chance Showers And Thunderstorms | 2 mph E | 27% |
| Tuesday Night | 65°F | Mostly Clear | 3 mph NNE | 9% |
| Wednesday | 92°F | Sunny | 2 mph E | 7% |
| Wednesday Night | 67°F | Mostly Clear | 1 to 5 mph NE | 4% |
| Thursday | 93°F | Mostly Sunny | 3 mph E | 5% |
| Thursday Night | 70°F | Partly Cloudy | 2 to 7 mph ENE | 11% |
| Friday | 92°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 1 to 5 mph ESE | 15% |
Forecast source: National Weather Service (api.weather.gov) for St. George (37.077, -113.577). Updated through the day.
Growing snapshot for St. George
Last spring frost
Mar 14
First fall frost
Nov 10
Growing season
239 days
Hardiness zone
8b
More local growing data for St. George: nearby ZIP 84790 weather · frost dates · planting calendar · Utah frost dates
Nearby towns & communities
Apple Valley
Central
Dammeron Valley
Enterprise
Hildale
Hurricane
Ivins
La Verkin
Leeds
New Harmony
Pine Valley
Rockville
Santa Clara
Springdale
Toquerville
Veyo
Virgin
Washington
Climate data from the nearest NOAA station, St George, Ut (5.7 mi from St. George). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.