St. George weather in September: St. George, Utah: normal highs, lows, rain and records for September
St. George in September has a normal high of 92°F and a normal low of 61°F, a daily mean of 77°F, falling from 97°F on the 1st to 87°F by the 30th. Measurable precipitation falls on 2 days in a normal September, 0.67 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 34°C and low of 16°C, 17 mm of precipitation in September.
- 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 September?
The normal high is 92°F and the normal low 61°F, for a daily mean of 76.5°F. September is 8.6°F cooler than August and 13.5°F warmer than October. September is the 4th warmest month of the year in St. George and the 7th wettest. Across the month the normal high falls 10°F, from 97°F on September 1 to 87°F on September 30. From one year to the next September's mean temperature typically moves about 1.8°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 75°F and 78°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 9%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 97°F | 66°F | 9% | 5% |
| September 8 | 95°F | 64°F | 9% | 5% |
| September 15 | 93°F | 61°F | 8% | 5% |
| September 22 | 90°F | 58°F | 8% | 4% |
| September 30 | 87°F | 55°F | 8% | 4% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 97°F | 66°F | 9% | 5% | 13 h |
| September 2 | 97°F | 66°F | 9% | 5% | 13 h |
| September 3 | 97°F | 66°F | 9% | 5% | 13 h |
| September 4 | 96°F | 65°F | 9% | 5% | 12 h 50 min |
| September 5 | 96°F | 65°F | 9% | 5% | 12 h 50 min |
| September 6 | 96°F | 65°F | 9% | 5% | 12 h 50 min |
| September 7 | 96°F | 64°F | 9% | 5% | 12 h 50 min |
| September 8 | 95°F | 64°F | 9% | 5% | 12 h 40 min |
| September 9 | 95°F | 63°F | 9% | 5% | 12 h 40 min |
| September 10 | 95°F | 63°F | 9% | 5% | 12 h 40 min |
| September 11 | 94°F | 63°F | 8% | 5% | 12 h 40 min |
| September 12 | 94°F | 62°F | 8% | 5% | 12 h 40 min |
| September 13 | 94°F | 62°F | 8% | 5% | 12 h 30 min |
| September 14 | 93°F | 62°F | 8% | 5% | 12 h 30 min |
| September 15 | 93°F | 61°F | 8% | 5% | 12 h 30 min |
| September 16 | 93°F | 61°F | 8% | 5% | 12 h 30 min |
| September 17 | 92°F | 60°F | 8% | 5% | 12 h 20 min |
| September 18 | 92°F | 60°F | 8% | 5% | 12 h 20 min |
| September 19 | 91°F | 59°F | 8% | 5% | 12 h 20 min |
| September 20 | 91°F | 59°F | 8% | 5% | 12 h 20 min |
| September 21 | 91°F | 59°F | 8% | 4% | 12 h 10 min |
| September 22 | 90°F | 58°F | 8% | 4% | 12 h 10 min |
| September 23 | 90°F | 58°F | 8% | 4% | 12 h 10 min |
| September 24 | 89°F | 57°F | 8% | 4% | 12 h 10 min |
| September 25 | 89°F | 57°F | 8% | 4% | 12 h 10 min |
| September 26 | 88°F | 56°F | 8% | 4% | 12 h |
| September 27 | 88°F | 56°F | 8% | 4% | 12 h |
| September 28 | 88°F | 55°F | 8% | 4% | 12 h |
| September 29 | 87°F | 55°F | 8% | 4% | 12 h |
| September 30 | 87°F | 55°F | 8% | 4% | 11 h 50 min |
- Normal high
- 92°FSeptember average
- Normal low
- 61°FSeptember average
- Precipitation
- 0.67 inmonth total
- Days with precipitation
- 20.01 inch or more
- Days at 90°F or more
- 23
- Daylight
- 13 h to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 29
- Sunshine
- 91%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 September?
On a given September day the chance of 0.01 inch or more is 8% on average, highest around September 1 (9%). In all, 0.67 in falls on 2 days of a normal September.
In a normal September in St. George, 23 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00427516.
What are the records for September in St. George?
The warmest September temperature on this station's record (since 1893) is 112°F, on September 7, 2022; the coldest is 25°F, on September 21, 1895. The wettest September brought 4.16 in (1939).
The September mean against the 1991-2020 normal of 76.5°F: 2021 79.4°F (+2.9), 2022 80.8°F (+4.3), 2023 74.5°F (−2.0), 2024 80.1°F (+3.6), 2025 77.8°F (+1.3), 2026 79.3°F (+2.8). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 79.4°F | +2.9°F | 0.72 in |
| 2022 | 80.8°F | +4.3°F | 0.99 in |
| 2023 | 74.5°F | −2.0°F | 3.96 in |
| 2024 | 80.1°F | +3.6°F | 0.00 in |
| 2025 | 77.8°F | +1.3°F | 0.77 in |
| 2026 | 79.3°F | +2.8°F | 1.15 in |
Source: records: ACIS, station USC00427516; recent months: ACIS, station USC00427516. Records and recent months use complete months only.
How does September in St. George compare across Utah?
Across the 97 places PlainClimate covers in Utah, September normal highs run from 61°F in Brian Head to 92°F in St. George; St. George's is 92°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.