Rolla weather in September: Rolla, Missouri: normal highs, lows, rain and records for September
Rolla in September has a normal high of 80°F and a normal low of 59°F, a daily mean of 70°F, falling from 85°F on the 1st to 75°F by the 30th. Measurable precipitation falls on 8 days in a normal September, 4.00 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 27°C and low of 15°C, 102 mm of precipitation in September.
- NOAA stationRolla Missouri S&t
- Station IDUSC00237263
- Location37.96°N 91.78°W
- Elevation1,173 ft (358 m)
- From the center1 miles
- Population20,660
- Jan 41° 22°
- Feb 46° 26°
- Mar 56° 35°
- Apr 67° 45°
- May 76° 56°
- Jun 84° 65°
- Jul 89° 69°
- Aug 88° 67°
- Sep 80° 59°
- Oct 69° 47°
- Nov 56° 36°
- Dec 45° 27°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Rolla in September?
The normal high is 80°F and the normal low 59°F, for a daily mean of 69.6°F. September is 8.0°F cooler than August and 11.4°F warmer than October. September is the 4th warmest month of the year in Rolla and the 7th wettest. Across the month the normal high falls 10°F, from 85°F on September 1 to 75°F on September 30. From one year to the next September's mean temperature typically moves about 3.0°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 67°F and 73°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 29%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 85°F | 64°F | 29% | 18% |
| September 8 | 83°F | 62°F | 28% | 18% |
| September 15 | 81°F | 59°F | 28% | 17% |
| September 22 | 78°F | 57°F | 27% | 17% |
| September 30 | 75°F | 53°F | 27% | 17% |
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 | 85°F | 64°F | 29% | 18% | 13 h |
| September 2 | 85°F | 64°F | 28% | 18% | 13 h |
| September 3 | 85°F | 63°F | 28% | 18% | 13 h |
| September 4 | 84°F | 63°F | 28% | 18% | 13 h |
| September 5 | 84°F | 63°F | 28% | 18% | 12 h 50 min |
| September 6 | 84°F | 63°F | 28% | 18% | 12 h 50 min |
| September 7 | 83°F | 62°F | 28% | 18% | 12 h 50 min |
| September 8 | 83°F | 62°F | 28% | 18% | 12 h 50 min |
| September 9 | 83°F | 61°F | 28% | 17% | 12 h 40 min |
| September 10 | 82°F | 61°F | 28% | 17% | 12 h 40 min |
| September 11 | 82°F | 61°F | 28% | 17% | 12 h 40 min |
| September 12 | 82°F | 60°F | 28% | 17% | 12 h 40 min |
| September 13 | 81°F | 60°F | 28% | 17% | 12 h 30 min |
| September 14 | 81°F | 60°F | 28% | 17% | 12 h 30 min |
| September 15 | 81°F | 59°F | 28% | 17% | 12 h 30 min |
| September 16 | 80°F | 59°F | 27% | 17% | 12 h 30 min |
| September 17 | 80°F | 58°F | 27% | 17% | 12 h 20 min |
| September 18 | 80°F | 58°F | 27% | 17% | 12 h 20 min |
| September 19 | 79°F | 58°F | 27% | 17% | 12 h 20 min |
| September 20 | 79°F | 57°F | 27% | 17% | 12 h 20 min |
| September 21 | 79°F | 57°F | 27% | 17% | 12 h 10 min |
| September 22 | 78°F | 57°F | 27% | 17% | 12 h 10 min |
| September 23 | 78°F | 56°F | 27% | 17% | 12 h 10 min |
| September 24 | 78°F | 56°F | 27% | 17% | 12 h 10 min |
| September 25 | 77°F | 55°F | 27% | 17% | 12 h 10 min |
| September 26 | 77°F | 55°F | 27% | 17% | 12 h |
| September 27 | 77°F | 55°F | 27% | 17% | 12 h |
| September 28 | 76°F | 54°F | 27% | 17% | 12 h |
| September 29 | 76°F | 54°F | 27% | 17% | 12 h |
| September 30 | 75°F | 53°F | 27% | 17% | 11 h 50 min |
- Normal high
- 80°FSeptember average
- Normal low
- 59°FSeptember average
- Precipitation
- 4.00 inmonth total
- Days with precipitation
- 80.01 inch or more
- Days at 90°F or more
- 4
- Daylight
- 13 h to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 27
- Days at 80°F or more
- 17
- Sunshine
- 81%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00237263; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Rolla in September?
On a given September day the chance of 0.01 inch or more is 27% on average, highest around September 1 (29%). In all, 4.00 in falls on 8 days of a normal September, 1 of them with an inch or more.
In a normal September in Rolla, 4 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00237263.
What are the records for September in Rolla?
The warmest September temperature on this station's record (since 1897) is 105°F, on September 4, 1913; the coldest is 32°F, on September 28, 1942. The wettest September brought 14.65 in (1993).
The September mean against the 1991-2020 normal of 69.6°F: 2021 72.5°F (+2.9), 2022 70.7°F (+1.1), 2023 71.3°F (+1.7), 2024 70.8°F (+1.2), 2025 73.2°F (+3.6), 2026 78.7°F (+9.1). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 72.5°F | +2.9°F | 3.30 in |
| 2022 | 70.7°F | +1.1°F | 2.67 in |
| 2023 | 71.3°F | +1.7°F | 1.10 in |
| 2024 | 70.8°F | +1.2°F | 1.44 in |
| 2025 | 73.2°F | +3.6°F | 3.21 in |
| 2026 | 78.7°F | +9.1°F | 1.38 in |
Source: records: ACIS, station USC00237263; recent months: ACIS, station USC00237263. Records and recent months use complete months only.
How does September in Rolla compare across Missouri?
Across the 134 places PlainClimate covers in Missouri, September normal highs run from 76°F in Unionville to 85°F in Kennett; Rolla's is 80°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.