St. George, UT weather in August
In August, St. George sees highs around 100°F and lows around 70°F: very hot and dry. There are about 3 days with rain. It is one of the warmest months in St. George. Plan outdoor time for mornings and evenings.
- Normal high
- 100°F
- Normal low
- 70°F
- Wet days
- 3
- 1.1 in total
- Daylight
- 13.6 h
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 102°F | 97°F |
| Normal low | 73°F | 67°F |
| Chance of a wet day | 10% | 9% |
| Sunrise / sunset | 6:39 am / 8:41 pm | 7:04 am / 8:04 pm |
| Daylight | 14.0 h | 13.0 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Mountain Time).
What kind of days to expect
- Comfortable dayshigh 65-80°F (temperature only: no humidity station nearby)0 of 31
- Hot dayshigh 90°F or more30 of 31
- Wet daysat least 0.01 in of rain or melted snow3 of 31
- Notable rainat least 0.10 in2 of 31
- Freezing nightslow 32°F or below0 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per August, counted from daily records for each year 1991-2020.
Rain in August
Normal precipitation is 1.1 in; a dry August brings about 0.3 in and a wet one about 1.7 in (25th and 75th percentiles). Days with half an inch or more are rare.
How August varies from year to year
- Warmest August, 1991-20201995: average high 106°F
- Coolest August2004: average high 98°F
- Wettest August2020: 2.0 in
- Driest August2002: no measurable precipitation
- Highest reading115°F (August 17, 2020)
- Lowest reading60°F (August 22, 1993)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
August compared with July and September
| July | August | September | |
|---|---|---|---|
| Normal high | 102°F | 100°F | 92°F |
| Normal low | 72°F | 70°F | 61°F |
| Wet days | 3 | 3 | 2 |
| Comfortable days | 0 | 0 | 1 |
| Daylight | 14.4 h | 13.6 h | 12.4 h |
Highs change by -2°F from July and -8°F into September.
Nearby alternatives in August
- Warmer: Furnace Creek, CA187 mi · high 116°F · 1 wet day
- Cooler: Bryce Canyon City, UT88 mi · high 78°F · 10 wet days
How St. George ranks in August
- Normal high13th warmest of 378 cities; 1st of 7 in Utah
- Wet days70th driest of 378
What to pack for St. George in August
- Light, breathable clothing – highs near 100°F
- Layers – afternoons near 100°F but nights near 70°F
Heating and cooling
August has 0 heating degree days and 623 cooling degree days (base 65°F), 11% of the year's total heating and cooling demand.
Questions
How hot is St. George in August?
The normal high is 100°F and the normal low is 70°F. From 1991 to 2020 the hottest August reading was 115°F (August 17, 2020).
Does it rain a lot in St. George in August?
About 3 days in August have at least 0.01 in of precipitation, and the normal total is 1.1 in. The wettest August in 1991-2020 was in 2020 (2.0 in); the driest was in 2002, with no measurable precipitation.
Is August a good time to visit St. George?
August ranks 12th of 12 months on our comfort score for St. George (36 out of 100). It has almost no comfortable days (judged by temperature only) and about 30 days at 90°F or hotter. The best months are March and April.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: St George (USC00427516), 1.6 mi NW of the city center, 2,857 ft (161 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Not available for this location: humidity and wind by hour, cloud cover and daily humidity and wind (no station close enough or similar enough in elevation).