St. Paul weather in September: St. Paul, Alaska: normal highs, lows, rain and records for September
St. Paul in September has a normal high of 50°F and a normal low of 42°F, a daily mean of 46°F, falling from 52°F on the 1st to 47°F by the 30th. Measurable precipitation falls on 20 days in a normal September, 3.00 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 10°C and low of 5°C, 76 mm of precipitation in September.
- NOAA stationSaint Paul Island Airport
- Station IDUSW00025713
- Location57.16°N 170.22°W
- Elevation35 ft (11 m)
- From the center4 miles
- Population439
- Jan 29° 21°
- Feb 29° 21°
- Mar 30° 21°
- Apr 34° 26°
- May 41° 32°
- Jun 48° 39°
- Jul 52° 44°
- Aug 53° 46°
- Sep 50° 42°
- Oct 44° 35°
- Nov 38° 30°
- Dec 33° 25°
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 50°F and the normal low 42°F, for a daily mean of 46.0°F. September is 3.5°F cooler than August and 6.5°F warmer than October. September is the 3rd warmest month of the year in St. Paul and the 3rd wettest. Across the month the normal high falls 5°F, from 52°F on September 1 to 47°F on September 30. From one year to the next September's mean temperature typically moves about 2.0°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 44°F and 48°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 69%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 52°F | 45°F | 61% | 28% |
| September 8 | 52°F | 44°F | 62% | 28% |
| September 15 | 50°F | 42°F | 65% | 28% |
| September 22 | 49°F | 40°F | 67% | 28% |
| September 30 | 47°F | 38°F | 69% | 30% |
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 | 52°F | 45°F | 61% | 28% | 14 h |
| September 2 | 52°F | 45°F | 61% | 28% | 14 h |
| September 3 | 52°F | 45°F | 61% | 28% | 13 h 50 min |
| September 4 | 52°F | 45°F | 61% | 28% | 13 h 50 min |
| September 5 | 52°F | 45°F | 62% | 28% | 13 h 40 min |
| September 6 | 52°F | 44°F | 62% | 28% | 13 h 40 min |
| September 7 | 52°F | 44°F | 62% | 28% | 13 h 30 min |
| September 8 | 52°F | 44°F | 62% | 28% | 13 h 30 min |
| September 9 | 51°F | 44°F | 63% | 28% | 13 h 20 min |
| September 10 | 51°F | 43°F | 63% | 28% | 13 h 20 min |
| September 11 | 51°F | 43°F | 63% | 28% | 13 h 10 min |
| September 12 | 51°F | 43°F | 64% | 28% | 13 h 10 min |
| September 13 | 51°F | 43°F | 64% | 28% | 13 h |
| September 14 | 51°F | 42°F | 64% | 28% | 13 h |
| September 15 | 50°F | 42°F | 65% | 28% | 12 h 50 min |
| September 16 | 50°F | 42°F | 65% | 28% | 12 h 50 min |
| September 17 | 50°F | 42°F | 65% | 28% | 12 h 40 min |
| September 18 | 50°F | 41°F | 66% | 28% | 12 h 40 min |
| September 19 | 50°F | 41°F | 66% | 28% | 12 h 30 min |
| September 20 | 49°F | 41°F | 66% | 28% | 12 h 30 min |
| September 21 | 49°F | 41°F | 67% | 28% | 12 h 30 min |
| September 22 | 49°F | 40°F | 67% | 28% | 12 h 20 min |
| September 23 | 49°F | 40°F | 67% | 28% | 12 h 20 min |
| September 24 | 49°F | 40°F | 68% | 28% | 12 h 10 min |
| September 25 | 48°F | 40°F | 68% | 28% | 12 h 10 min |
| September 26 | 48°F | 39°F | 68% | 29% | 12 h |
| September 27 | 48°F | 39°F | 69% | 29% | 12 h |
| September 28 | 48°F | 39°F | 69% | 29% | 11 h 50 min |
| September 29 | 48°F | 39°F | 69% | 29% | 11 h 50 min |
| September 30 | 47°F | 38°F | 69% | 30% | 11 h 40 min |
- Normal high
- 50°FSeptember average
- Normal low
- 42°FSeptember average
- Precipitation
- 3.00 inmonth total
- Days with precipitation
- 200.01 inch or more
- Nights at 32°F or colder
- 2
- Daylight
- 14 h to 11 h 40 minSeptember 1 to September 30
- Sunshine
- 55%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00025713; 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 65% on average, highest around September 30 (69%). In all, 3.00 in falls on 20 days of a normal September.
In a normal September in St. Paul, 2 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00025713.
How humid and windy is St. Paul in September?
At 3 p.m. the normal temperature is 46°F with 78% relative humidity and a dew point of 40°F; at 6 a.m. it is 42°F with 87% humidity. The wind averages 15.6 mph, most often from the northwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 42°F | 38°F | 87% | 14.9 mph | – |
| 9 a.m. | 42°F | 39°F | 87% | 14.7 mph | – |
| noon | 45°F | 40°F | 81% | 17.0 mph | – |
| 3 p.m. | 46°F | 40°F | 78% | 17.2 mph | – |
| 6 p.m. | 45°F | 39°F | 80% | 16.7 mph | – |
| 9 p.m. | 43°F | 38°F | 85% | 14.9 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00025713. 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 1892) is 62°F, on September 12, 1925; the coldest is 22°F, on September 25, 1992. The wettest September brought 6.02 in (1924); the snowiest, 1.0 inches (1933).
The September mean against the 1991-2020 normal of 46.0°F: 2021 46.0°F (at normal), 2022 45.7°F (−0.3), 2023 45.5°F (−0.5), 2024 45.5°F (−0.5), 2025 46.8°F (+0.8), 2026 46.9°F (+0.9). 2 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 46.0°F | at normal | 4.02 in |
| 2022 | 45.7°F | −0.3°F | 2.11 in |
| 2023 | 45.5°F | −0.5°F | 3.71 in |
| 2024 | 45.5°F | −0.5°F | 3.48 in |
| 2025 | 46.8°F | +0.8°F | 2.65 in |
| 2026 | 46.9°F | +0.9°F | 5.32 in |
Source: records: ACIS, station USW00025713; recent months: ACIS, station USW00025713. Records and recent months use complete months only.
How does September in St. Paul compare across Alaska?
Across the 85 places PlainClimate covers in Alaska, September normal highs run from 37°F in Utqiaġvik to 60°F in Klawock; St. Paul's is 50°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.