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St. George, UT Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for St. George, a city in Washington County, Utah.

Today
91°F
Sunny
Sunny, with a high near 91. North northeast wind 1 to 6 mph.

7-day forecast for St. George

WhenTempForecastWindPrecip
Today 91°F Sunny 1 to 6 mph NNE 0%
Tonight 63°F Mostly Clear 2 to 7 mph NE 0%
Sunday 92°F Mostly Sunny 1 mph N 0%
Sunday Night 67°F Partly Cloudy 2 mph NNW 0%
Monday 92°F Mostly Sunny 2 mph ESE 3%
Monday Night 66°F Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms 3 mph E 34%
Tuesday 89°F Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms 3 mph E 35%
Tuesday Night 64°F Mostly Clear 3 mph NNE 8%
Wednesday 92°F Sunny 1 mph E 3%
Wednesday Night 68°F Mostly Clear 3 mph N 4%
Thursday 95°F Sunny 2 mph E 3%
Thursday Night 69°F Partly Cloudy 2 to 6 mph E 11%
Friday 93°F Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms 3 mph SE 20%
Friday Night 69°F Mostly Clear 5 mph ESE 11%

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

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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.