Glasgow weather in September: Glasgow, Montana: normal highs, lows, rain and records for September
Glasgow in September has a normal high of 73°F and a normal low of 47°F, a daily mean of 60°F, falling from 79°F on the 1st to 66°F by the 30th. Measurable precipitation falls on 7 days in a normal September, 1.06 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 23°C and low of 8°C, 27 mm of precipitation in September.
- NOAA stationGlasgow International Airport
- Station IDUSW00094008
- Location48.21°N 106.62°W
- Elevation2,285 ft (697 m)
- Population3,169
- Jan 24° 6°
- Feb 28° 9°
- Mar 42° 21°
- Apr 57° 33°
- May 68° 43°
- Jun 76° 53°
- Jul 86° 59°
- Aug 85° 57°
- Sep 73° 47°
- Oct 57° 34°
- Nov 40° 21°
- Dec 27° 10°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Glasgow in September?
The normal high is 73°F and the normal low 47°F, for a daily mean of 59.9°F. September is 11.1°F cooler than August and 14.7°F warmer than October. September is the 4th warmest month of the year in Glasgow and the 5th wettest. Across the month the normal high falls 13°F, from 79°F on September 1 to 66°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 57°F and 63°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 24%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 79°F | 52°F | 23% | 10% |
| September 8 | 76°F | 50°F | 23% | 10% |
| September 15 | 73°F | 47°F | 23% | 9% |
| September 22 | 70°F | 45°F | 23% | 9% |
| September 30 | 66°F | 41°F | 23% | 9% |
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 | 79°F | 52°F | 23% | 10% | 13 h 30 min |
| September 2 | 79°F | 52°F | 23% | 10% | 13 h 20 min |
| September 3 | 79°F | 52°F | 23% | 10% | 13 h 20 min |
| September 4 | 78°F | 51°F | 23% | 10% | 13 h 20 min |
| September 5 | 78°F | 51°F | 23% | 10% | 13 h 10 min |
| September 6 | 77°F | 51°F | 23% | 10% | 13 h 10 min |
| September 7 | 77°F | 50°F | 23% | 10% | 13 h 10 min |
| September 8 | 76°F | 50°F | 23% | 10% | 13 h |
| September 9 | 76°F | 49°F | 23% | 10% | 13 h |
| September 10 | 76°F | 49°F | 23% | 10% | 13 h |
| September 11 | 75°F | 49°F | 23% | 10% | 12 h 50 min |
| September 12 | 75°F | 48°F | 23% | 10% | 12 h 50 min |
| September 13 | 74°F | 48°F | 23% | 10% | 12 h 50 min |
| September 14 | 74°F | 48°F | 23% | 9% | 12 h 40 min |
| September 15 | 73°F | 47°F | 23% | 9% | 12 h 40 min |
| September 16 | 73°F | 47°F | 23% | 9% | 12 h 40 min |
| September 17 | 72°F | 46°F | 23% | 9% | 12 h 30 min |
| September 18 | 72°F | 46°F | 23% | 9% | 12 h 30 min |
| September 19 | 71°F | 46°F | 23% | 9% | 12 h 30 min |
| September 20 | 71°F | 45°F | 24% | 9% | 12 h 20 min |
| September 21 | 71°F | 45°F | 23% | 9% | 12 h 20 min |
| September 22 | 70°F | 45°F | 23% | 9% | 12 h 20 min |
| September 23 | 70°F | 44°F | 23% | 9% | 12 h 10 min |
| September 24 | 69°F | 44°F | 23% | 9% | 12 h 10 min |
| September 25 | 69°F | 43°F | 23% | 9% | 12 h 10 min |
| September 26 | 68°F | 43°F | 23% | 9% | 12 h |
| September 27 | 67°F | 42°F | 23% | 9% | 12 h |
| September 28 | 67°F | 42°F | 23% | 9% | 11 h 50 min |
| September 29 | 66°F | 42°F | 23% | 9% | 11 h 50 min |
| September 30 | 66°F | 41°F | 23% | 9% | 11 h 50 min |
- Normal high
- 73°FSeptember average
- Normal low
- 47°FSeptember average
- Precipitation
- 1.06 inmonth total
- Days with precipitation
- 70.01 inch or more
- Days at 90°F or more
- 3
- Nights at 32°F or colder
- 1
- Daylight
- 13 h 30 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 19
- Days at 80°F or more
- 9
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094008; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Glasgow in September?
On a given September day the chance of 0.01 inch or more is 23% on average, highest around September 20 (24%). In all, 1.06 in falls on 7 days of a normal September.
In a normal September in Glasgow, 3 days reach 90°F and 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094008.
How humid and windy is Glasgow in September?
At 3 p.m. the normal temperature is 64°F with 34% relative humidity and a dew point of 35°F; at 6 a.m. it is 42°F with 75% humidity. The wind averages 10.4 mph, most often from the west-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 | 35°F | 75% | 9.0 mph | 75% |
| 9 a.m. | 51°F | 38°F | 60% | 10.6 mph | 70% |
| noon | 61°F | 37°F | 41% | 12.4 mph | 70% |
| 3 p.m. | 64°F | 35°F | 34% | 13.4 mph | 70% |
| 6 p.m. | 58°F | 35°F | 43% | 9.5 mph | 72% |
| 9 p.m. | 50°F | 36°F | 57% | 10.0 mph | 75% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00094008. 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 Glasgow?
The warmest September temperature on Glasgow's official record (since 1893) is 106°F, on September 7, 2022; the coldest is 14°F, on September 25, 1928. The wettest September brought 4.72 in (1938); the snowiest, 4.6 inches (1926).
The September mean against the 1991-2020 normal of 59.9°F: 2021 63.6°F (+3.7), 2022 65.9°F (+6.0), 2023 65.8°F (+5.9), 2024 67.8°F (+7.9), 2025 65.4°F (+5.5), 2026 61.9°F (+2.0). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 63.6°F | +3.7°F | 0.03 in |
| 2022 | 65.9°F | +6.0°F | 0.13 in |
| 2023 | 65.8°F | +5.9°F | 0.71 in |
| 2024 | 67.8°F | +7.9°F | 1.60 in |
| 2025 | 65.4°F | +5.5°F | 0.23 in |
| 2026 | 61.9°F | +2.0°F | 2.13 in |
Source: records: ACIS, NWS threaded record GGWthr; recent months: ACIS, station USW00094008. Records and recent months use complete months only.
How does September in Glasgow compare across Montana?
Across the 141 places PlainClimate covers in Montana, September normal highs run from 62°F in Cooke City to 79°F in Hardin; Glasgow's is 73°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.