St. Paul weather in September: St. Paul, Minnesota: normal highs, lows, rain and records for September
St. Paul in September has a normal high of 72°F and a normal low of 53°F, a daily mean of 63°F, falling from 78°F on the 1st to 66°F by the 30th. Measurable precipitation falls on 10 days in a normal September, 3.08 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 22°C and low of 12°C, 78 mm of precipitation in September.
- NOAA stationSt Paul Downtown Airport
- Station IDUSW00014927
- Location44.93°N 93.06°W
- Elevation700 ft (213 m)
- From the center3 miles
- Population307,465
- Jan 24° 9°
- Feb 29° 13°
- Mar 42° 25°
- Apr 57° 37°
- May 69° 49°
- Jun 79° 59°
- Jul 83° 64°
- Aug 80° 62°
- Sep 72° 53°
- Oct 58° 40°
- Nov 42° 27°
- Dec 29° 15°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is St. Paul in September?
The normal high is 72°F and the normal low 53°F, for a daily mean of 62.9°F. September is 8.2°F cooler than August and 13.9°F warmer than October. September is the 4th warmest month of the year in St. Paul and the 5th wettest. Across the month the normal high falls 12°F, from 78°F on September 1 to 66°F on September 30. From one year to the next September's mean temperature typically moves about 2.7°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 60°F and 66°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 33%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 78°F | 59°F | 32% | 18% |
| September 8 | 76°F | 57°F | 32% | 18% |
| September 15 | 73°F | 54°F | 32% | 18% |
| September 22 | 70°F | 51°F | 33% | 18% |
| September 30 | 66°F | 47°F | 32% | 18% |
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 | 78°F | 59°F | 32% | 18% | 13 h 20 min |
| September 2 | 77°F | 58°F | 32% | 18% | 13 h 20 min |
| September 3 | 77°F | 58°F | 32% | 18% | 13 h 10 min |
| September 4 | 77°F | 58°F | 32% | 18% | 13 h 10 min |
| September 5 | 76°F | 58°F | 32% | 18% | 13 h 10 min |
| September 6 | 76°F | 57°F | 32% | 18% | 13 h |
| September 7 | 76°F | 57°F | 32% | 18% | 13 h |
| September 8 | 76°F | 57°F | 32% | 18% | 13 h |
| September 9 | 75°F | 56°F | 32% | 18% | 12 h 50 min |
| September 10 | 75°F | 56°F | 32% | 18% | 12 h 50 min |
| September 11 | 74°F | 55°F | 32% | 18% | 12 h 50 min |
| September 12 | 74°F | 55°F | 32% | 18% | 12 h 50 min |
| September 13 | 74°F | 55°F | 32% | 18% | 12 h 40 min |
| September 14 | 73°F | 54°F | 32% | 18% | 12 h 40 min |
| September 15 | 73°F | 54°F | 32% | 18% | 12 h 40 min |
| September 16 | 73°F | 54°F | 32% | 18% | 12 h 30 min |
| September 17 | 72°F | 53°F | 32% | 18% | 12 h 30 min |
| September 18 | 72°F | 53°F | 33% | 18% | 12 h 30 min |
| September 19 | 71°F | 52°F | 33% | 18% | 12 h 20 min |
| September 20 | 71°F | 52°F | 33% | 18% | 12 h 20 min |
| September 21 | 70°F | 51°F | 33% | 18% | 12 h 20 min |
| September 22 | 70°F | 51°F | 33% | 18% | 12 h 10 min |
| September 23 | 70°F | 50°F | 33% | 18% | 12 h 10 min |
| September 24 | 69°F | 50°F | 33% | 18% | 12 h 10 min |
| September 25 | 69°F | 50°F | 33% | 18% | 12 h 10 min |
| September 26 | 68°F | 49°F | 33% | 18% | 12 h |
| September 27 | 68°F | 49°F | 33% | 18% | 12 h |
| September 28 | 67°F | 48°F | 33% | 18% | 12 h |
| September 29 | 67°F | 48°F | 32% | 18% | 11 h 50 min |
| September 30 | 66°F | 47°F | 32% | 18% | 11 h 50 min |
- Normal high
- 72°FSeptember average
- Normal low
- 53°FSeptember average
- Precipitation
- 3.08 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 20
- Days at 80°F or more
- 8
- Sunshine
- 76%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014927; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in St. Paul in September?
On a given September day the chance of 0.01 inch or more is 32% on average, highest around September 20 (33%). In all, 3.08 in falls on 10 days of a normal September, 1 of them with an inch or more.
In a normal September in St. Paul, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014927.
How humid and windy is St. Paul in September?
At 3 p.m. the normal temperature is 64°F with 50% relative humidity and a dew point of 45°F; at 6 a.m. it is 49°F with 83% humidity. The wind averages 8.1 mph, most often from the west-southwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 49°F | 44°F | 83% | 6.2 mph | 63% |
| 9 a.m. | 55°F | 46°F | 72% | 8.5 mph | 61% |
| noon | 62°F | 46°F | 56% | 10.9 mph | 58% |
| 3 p.m. | 64°F | 45°F | 50% | 11.2 mph | 57% |
| 6 p.m. | 60°F | 45°F | 59% | 8.2 mph | 63% |
| 9 p.m. | 54°F | 46°F | 72% | 6.7 mph | 69% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014927. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in St. Paul?
The warmest September temperature on this station's record (since 1872) is 101°F, on September 10, 1931; the coldest is 28°F, on September 30, 1899. The wettest September brought 9.95 in (1881).
The September mean against the 1991-2020 normal of 62.9°F: 2021 65.6°F (+2.7), 2022 65.3°F (+2.4), 2023 68.9°F (+6.0), 2024 69.5°F (+6.6), 2026 67.2°F (+4.3). 5 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 65.6°F | +2.7°F | 1.86 in |
| 2022 | 65.3°F | +2.4°F | 0.19 in |
| 2023 | 68.9°F | +6.0°F | 4.46 in |
| 2024 | 69.5°F | +6.6°F | 0.17 in |
| 2026 | 67.2°F | +4.3°F | 3.75 in |
Source: records: ACIS, station USW00014927; recent months: ACIS, station USW00014927. Records and recent months use complete months only.
How does September in St. Paul compare across Minnesota?
Across the 129 places PlainClimate covers in Minnesota, September normal highs run from 62°F in Lutsen to 76°F in Milan; St. Paul's is 72°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.