SunRiver, St. George Weather
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Climate of SunRiver: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in SunRiver, with average daytime highs around 38°C. December is the coolest, when nights typically fall to about -2°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 39°C, so the seasons feel very different from each other.
The area receives about 250 mm of rain in a typical year. Rainfall is modest in every month; February is the wettest at about 30 mm. The driest stretch is April to June, September and November, with under 20 mm a month.
For outdoor plans and travel, April to May and October usually offer the most comfortable weather in SunRiver, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 11° | -2° | 27 mm | 51% |
| Feb | 13° | 0° | 30 mm | 48% |
| Mar | 18° | 4° | 23 mm | 41% |
| Apr | 23° | 7° | 17 mm | 34% |
| May | 29° | 13° | 10 mm | 27% |
| Jun | 36° | 19° | 3 mm | 18% |
| Jul | 38° | 23° | 26 mm | 28% |
| Aug | 36° | 22° | 26 mm | 31% |
| Sep | 32° | 17° | 18 mm | 28% |
| Oct | 24° | 9° | 23 mm | 34% |
| Nov | 17° | 3° | 18 mm | 41% |
| Dec | 10° | -2° | 29 mm | 51% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around SunRiver. Values describe typical conditions, not a forecast.
About SunRiver weather
SunRiver is set in Utah's high-desert climate, framed by the Wasatch mountains, about 386 km south-west of Provo. Summers bring hot, dry summers (June–August) with highs often above 32°C in the valleys. The year winds down with cold winters with heavy mountain snowfall and milder valley conditions. This page shows live, auto-refreshing weather for SunRiver: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Denver.
Frequently asked questions
SunRiver is about 386 km south-west of Provo, in Utah.
SunRiver sees cold winters with heavy mountain snowfall and milder valley conditions.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for SunRiver's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in SunRiver, with average daytime highs of about 38°C and nights around 23°C.
The coldest nights come in December, when the average low is about -2°C and daytime highs reach around 10°C. Frost is possible on clear, calm nights.
SunRiver receives about 250 mm of rain in a typical year. February is the wettest month at roughly 30 mm; no month averages more than 100 mm.
April to May and October usually offer the most comfortable weather in SunRiver, with mild daytime temperatures and little rain.
In November SunRiver typically sees daytime highs near 17°C and lows near 3°C, with about 18 mm of rain over the month and average humidity around 41%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
Live temperature for SunRiver is shown at the top of this page and refreshes automatically — see the hourly breakdown below for how it changes through the day.
SunRiver's day-to-day weather follows the broader pattern of Utah described above. See the hourly weather forecast or the air quality index for more detail.