St. George, UT Climate & Monthly Averages
St. George has a hot desert climate. July is the hottest month, averaging 103° by day; January is the coldest at 53°.
St. George's climate runs on sunshine and sparse rain
With 8.3 inches (211 mm) of annual precipitation, St. George is one of the drier places we cover. January is the wettest month it gets, at 1.4 inches (36 mm), and the year runs between 53°F (11°C) and 103°F (39°C) by day.
What the dry climate changes
Snow falls on roughly 3 days a year, mostly February through March. At its warmest, in July, St. George runs to 103°F (39°C) in the afternoon and back to 80°F (26°C) by dawn. January sits at the other end of the year: 53°F (11°C) by day, 35°F (2°C) at night. The gridded 2015-2024 daily record for this location tops out at 116°F (46°C) and bottoms at 16°F (-9°C) - decade extremes, not all-time station records.
Average highs hold at or above 30°C for 4 months of the year, June through September being the unbroken run.
Sunshine averages 11.0 hours a day over the year - sunnier than 95% of the 3496 cities in our dataset, peaking in June at 13.9 hours.
More climate facts for St. George
- Hottest month: July - highs near 103°F (39°C)
- Coldest month: January - highs near 53°F (11°C)
- Decade extremes (2015-2024): 116°F (46°C) high · 16°F (-9°C) low
- Wettest month: January (6 rainy days) · Sunniest: June (13.9 h sun/day)
- Climate type: hot desert
- Annual swing: 27°C between the average warmest and coolest month · day to night: 12°C
- Snow: about 3 days a year
- Months averaging 30°C or hotter: 4
- Average humidity: 34%
Heat, cold and scarce precipitation in the dataset
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need another precipitation unit? Use the rainfall converter.
When the dry weather is easiest to use
Avoiding the hardest heat or cold
The best time to visit St. George is generally March to April and October to November, when temperatures sit either side of the peak heat rather than in it. Daytime temperatures in that window sit near 71°F (22°C), with rain on about 3 days a month. For the same question asked the other way round, see where else is warm in March.
Prepare for sun and cooler nights
Pack for St. George with lightweight, breathable clothing and serious sun protection and a warm jacket and layers for the cooler season. Even in July, lows of 80°F (26°C) make an extra layer worth the space.
Monthly heat and rainfall table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 53° | 35° | 6 | 1.4 in | 8.1 h/day | 9.9 h | 19% | 56% |
| February | 58° | 37° | 5 | 1.2 in | 9.3 h/day | 10.8 h | 18% | 48% |
| March | 66° | 44° | 6 | 1.3 in | 10.3 h/day | 11.9 h | 20% | 43% |
| April | 77° | 52° | 2 | 0.5 in | 12.2 h/day | 13.1 h | 7% | 27% |
| May | 85° | 61° | 2 | 0.3 in | 12.8 h/day | 14.1 h | 5% | 22% |
| June | 99° | 74° | 0 | 0.1 in | 13.9 h/day | 14.7 h | 1% | 14% |
| July | 103° | 80° | 2 | 0.3 in | 13.1 h/day | 14.5 h | 6% | 21% |
| August | 100° | 76° | 2 | 0.4 in | 12.6 h/day | 13.6 h | 7% | 26% |
| September | 93° | 69° | 2 | 0.4 in | 11.7 h/day | 12.4 h | 6% | 25% |
| October | 79° | 55° | 2 | 0.6 in | 10.4 h/day | 11.2 h | 7% | 32% |
| November | 63° | 43° | 3 | 0.8 in | 9.1 h/day | 10.1 h | 9% | 39% |
| December | 53° | 35° | 5 | 1.1 in | 8.0 h/day | 9.6 h | 15% | 49% |
How daytime heat and cool nights change by month
Each card shows the average high and low. The bar places that month between St. George's coldest night and warmest afternoon.
January
- Rain
- 6 days
- Sunshine
- 8.1 h
- Daylight
- 9.9 h
February
- Rain
- 5 days
- Sunshine
- 9.3 h
- Daylight
- 10.8 h
- Snow
- 1 day
March
- Rain
- 6 days
- Sunshine
- 10.3 h
- Daylight
- 11.9 h
April
- Rain
- 2 days
- Sunshine
- 12.2 h
- Daylight
- 13.1 h
May
- Rain
- 2 days
- Sunshine
- 12.8 h
- Daylight
- 14.1 h
June
- Rain
- 0 days
- Sunshine
- 13.9 h
- Daylight
- 14.7 h
July
- Rain
- 2 days
- Sunshine
- 13.1 h
- Daylight
- 14.5 h
August
- Rain
- 2 days
- Sunshine
- 12.6 h
- Daylight
- 13.6 h
September
- Rain
- 2 days
- Sunshine
- 11.7 h
- Daylight
- 12.4 h
October
- Rain
- 2 days
- Sunshine
- 10.4 h
- Daylight
- 11.2 h
November
- Rain
- 3 days
- Sunshine
- 9.1 h
- Daylight
- 10.1 h
December
- Rain
- 5 days
- Sunshine
- 8.0 h
- Daylight
- 9.6 h
Looking for warmer alternatives? Browse warm places by month, or compare St. George's coolest part of the year: January, December, February.
Heat and cold across the St. George year
Spring (March through May)
Through spring, St. George brings comfortable warmth: 76°F (25°C) by day, 52°F (11°C) after dark, and rain comes on about 10 days over the three months. Daylight is generous - around 11.8 hours of sun a day.
Summer (June through August)
Through summer, St. George runs at full heat: 100°F (38°C) by day, 77°F (25°C) after dark, and precipitation is sparse, near 19 mm (0.8 in) for the season. Daylight is generous - around 13.2 hours of sun a day.
Fall (September through November)
Through fall, St. George brings comfortable warmth: 78°F (26°C) by day, 55°F (13°C) after dark, and precipitation is sparse, near 1.8 inches (45 mm) for the season. Daylight is generous - around 10.4 hours of sun a day.
Winter (December through February)
Winter in St. George is mild, with daytime highs averaging 54°F (12°C) and nights around 36°F (2°C); rain comes on about 16 days over the three months, plus about 2 snowy days.
How unusual is St. George?
- Relative humidity averages 34% - drier than almost every other city we track.
- Annual precipitation is 8.3 inches (211 mm) - drier than all but 4% of the 3496 cities we track.
- Rain or snow reaches the ground on 37 days a year - fewer wet days than all but 5% of the 3496 cities we track.
These comparisons use the same ten-year window for every city in the dataset.