St. George weather in August: St. George, Utah: normal highs, lows, rain and records for August
St. George in August has a normal high of 100°F and a normal low of 70°F, a daily mean of 85°F, falling from 102°F on the 1st to 97°F by the 31st. Measurable precipitation falls on 3 days in a normal August, 1.07 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 38°C and low of 21°C, 27 mm of precipitation in August.
- NOAA stationSt George
- Station IDUSC00427516
- Location37.12°N 113.61°W
- Elevation2,857 ft (871 m)
- Population106,288
- Jan 54° 28°
- Feb 59° 32°
- Mar 68° 39°
- Apr 75° 46°
- May 85° 56°
- Jun 96° 65°
- Jul 102° 72°
- Aug 100° 70°
- Sep 92° 61°
- Oct 79° 47°
- Nov 64° 35°
- Dec 53° 28°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is St. George in August?
The normal high is 100°F and the normal low 70°F, for a daily mean of 85.1°F. August is 1.7°F cooler than July and 8.6°F warmer than September. August is the 2nd warmest month of the year in St. George and the 3rd wettest. Across the month the normal high falls 5°F, from 102°F on August 1 to 97°F on August 31. From one year to the next August's mean temperature typically moves about 1.5°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 84°F and 87°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 10%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 102°F | 73°F | 10% | 6% |
| August 8 | 101°F | 72°F | 10% | 5% |
| August 15 | 100°F | 71°F | 10% | 5% |
| August 22 | 99°F | 69°F | 10% | 5% |
| August 31 | 97°F | 67°F | 9% | 5% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 1, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 102°F | 73°F | 10% | 6% | 14 h |
| August 2 | 102°F | 73°F | 10% | 6% | 14 h |
| August 3 | 102°F | 73°F | 10% | 6% | 14 h |
| August 4 | 102°F | 73°F | 10% | 5% | 14 h |
| August 5 | 102°F | 72°F | 10% | 5% | 14 h |
| August 6 | 101°F | 72°F | 10% | 5% | 14 h |
| August 7 | 101°F | 72°F | 10% | 5% | 13 h 50 min |
| August 8 | 101°F | 72°F | 10% | 5% | 13 h 50 min |
| August 9 | 101°F | 72°F | 10% | 5% | 13 h 50 min |
| August 10 | 101°F | 72°F | 10% | 5% | 13 h 50 min |
| August 11 | 101°F | 72°F | 10% | 5% | 13 h 50 min |
| August 12 | 101°F | 71°F | 10% | 5% | 13 h 40 min |
| August 13 | 101°F | 71°F | 10% | 5% | 13 h 40 min |
| August 14 | 100°F | 71°F | 10% | 5% | 13 h 40 min |
| August 15 | 100°F | 71°F | 10% | 5% | 13 h 40 min |
| August 16 | 100°F | 71°F | 10% | 5% | 13 h 40 min |
| August 17 | 100°F | 70°F | 10% | 5% | 13 h 30 min |
| August 18 | 100°F | 70°F | 10% | 5% | 13 h 30 min |
| August 19 | 100°F | 70°F | 10% | 5% | 13 h 30 min |
| August 20 | 99°F | 70°F | 10% | 5% | 13 h 30 min |
| August 21 | 99°F | 70°F | 10% | 5% | 13 h 30 min |
| August 22 | 99°F | 69°F | 10% | 5% | 13 h 20 min |
| August 23 | 99°F | 69°F | 10% | 5% | 13 h 20 min |
| August 24 | 99°F | 69°F | 10% | 5% | 13 h 20 min |
| August 25 | 99°F | 68°F | 9% | 5% | 13 h 20 min |
| August 26 | 98°F | 68°F | 9% | 5% | 13 h 10 min |
| August 27 | 98°F | 68°F | 9% | 5% | 13 h 10 min |
| August 28 | 98°F | 68°F | 9% | 5% | 13 h 10 min |
| August 29 | 98°F | 67°F | 9% | 5% | 13 h 10 min |
| August 30 | 98°F | 67°F | 9% | 5% | 13 h 10 min |
| August 31 | 97°F | 67°F | 9% | 5% | 13 h |
- Normal high
- 100°FAugust average
- Normal low
- 70°FAugust average
- Precipitation
- 1.07 inmonth total
- Days with precipitation
- 30.01 inch or more
- Days at 90°F or more
- 30
- Daylight
- 14 h to 13 hAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 31
- Sunshine
- 90%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00427516; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in St. George in August?
On a given August day the chance of 0.01 inch or more is 10% on average, highest around August 1 (10%). In all, 1.07 in falls on 3 days of a normal August.
In a normal August in St. George, 30 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00427516.
What are the records for August in St. George?
The warmest August temperature on this station's record (since 1893) is 115°F, on August 17, 2020; the coldest is 40°F, on August 12, 1894. The wettest August brought 3.01 in (1925).
The August mean against the 1991-2020 normal of 85.1°F: 2021 86.6°F (+1.5), 2022 85.5°F (+0.5), 2023 83.1°F (−2.0), 2024 86.3°F (+1.2), 2025 86.3°F (+1.2), 2026 89.0°F (+3.9). 5 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 86.6°F | +1.5°F | 0.44 in |
| 2022 | 85.5°F | +0.5°F | 0.79 in |
| 2023 | 83.1°F | −2.0°F | 1.57 in |
| 2024 | 86.3°F | +1.2°F | 1.64 in |
| 2025 | 86.3°F | +1.2°F | 0.44 in |
| 2026 | 89.0°F | +3.9°F | 0.96 in |
Source: records: ACIS, station USC00427516; recent months: ACIS, station USC00427516. Records and recent months use complete months only.
How does August in St. George compare across Utah?
Across the 97 places PlainClimate covers in Utah, August normal highs run from 69°F in Brian Head to 100°F in St. George; St. George's is 100°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.