Havre weather in September: Havre, Montana: normal highs, lows, rain and records for September
Havre in September has a normal high of 73°F and a normal low of 43°F, a daily mean of 58°F, falling from 79°F on the 1st to 67°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 6°C, 27 mm of precipitation and 1 cm of snow in September.
- NOAA stationHavre Airport Asos
- Station IDUSW00094012
- Location48.54°N 109.76°W
- Elevation2,585 ft (788 m)
- Population9,204
- Jan 28° 7°
- Feb 33° 10°
- Mar 44° 20°
- Apr 57° 31°
- May 68° 40°
- Jun 76° 49°
- Jul 86° 54°
- Aug 85° 52°
- Sep 73° 43°
- Oct 58° 31°
- Nov 42° 20°
- Dec 32° 11°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Havre in September?
The normal high is 73°F and the normal low 43°F, for a daily mean of 57.7°F. September is 10.7°F cooler than August and 13.6°F warmer than October. September is the 4th warmest month of the year in Havre and the 4th wettest. Across the month the normal high falls 12°F, from 79°F on September 1 to 67°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 55°F and 60°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 23%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 79°F | 47°F | 23% | 10% |
| September 8 | 76°F | 45°F | 23% | 10% |
| September 15 | 73°F | 43°F | 23% | 10% |
| September 22 | 70°F | 41°F | 23% | 10% |
| September 30 | 67°F | 38°F | 22% | 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 | 47°F | 23% | 10% | 13 h 30 min |
| September 2 | 78°F | 47°F | 23% | 10% | 13 h 30 min |
| September 3 | 78°F | 46°F | 23% | 10% | 13 h 20 min |
| September 4 | 78°F | 46°F | 23% | 10% | 13 h 20 min |
| September 5 | 77°F | 46°F | 23% | 10% | 13 h 20 min |
| September 6 | 77°F | 45°F | 23% | 10% | 13 h 10 min |
| September 7 | 77°F | 45°F | 23% | 10% | 13 h 10 min |
| September 8 | 76°F | 45°F | 23% | 10% | 13 h |
| September 9 | 76°F | 45°F | 23% | 10% | 13 h |
| September 10 | 75°F | 44°F | 23% | 10% | 13 h |
| September 11 | 75°F | 44°F | 23% | 10% | 12 h 50 min |
| September 12 | 75°F | 44°F | 23% | 10% | 12 h 50 min |
| September 13 | 74°F | 43°F | 23% | 10% | 12 h 50 min |
| September 14 | 74°F | 43°F | 23% | 10% | 12 h 40 min |
| September 15 | 73°F | 43°F | 23% | 10% | 12 h 40 min |
| September 16 | 73°F | 42°F | 23% | 10% | 12 h 40 min |
| September 17 | 73°F | 42°F | 23% | 10% | 12 h 30 min |
| September 18 | 72°F | 42°F | 23% | 10% | 12 h 30 min |
| September 19 | 72°F | 42°F | 23% | 10% | 12 h 30 min |
| September 20 | 71°F | 41°F | 23% | 10% | 12 h 20 min |
| September 21 | 71°F | 41°F | 23% | 10% | 12 h 20 min |
| September 22 | 70°F | 41°F | 23% | 10% | 12 h 20 min |
| September 23 | 70°F | 40°F | 23% | 10% | 12 h 10 min |
| September 24 | 70°F | 40°F | 22% | 10% | 12 h 10 min |
| September 25 | 69°F | 40°F | 22% | 10% | 12 h 10 min |
| September 26 | 69°F | 39°F | 22% | 9% | 12 h |
| September 27 | 68°F | 39°F | 22% | 9% | 12 h |
| September 28 | 68°F | 38°F | 22% | 9% | 11 h 50 min |
| September 29 | 67°F | 38°F | 22% | 9% | 11 h 50 min |
| September 30 | 67°F | 38°F | 22% | 9% | 11 h 50 min |
- Normal high
- 73°FSeptember average
- Normal low
- 43°FSeptember average
- Precipitation
- 1.06 inmonth total
- Days with precipitation
- 70.01 inch or more
- Snowfall
- 0.4 inmonth total
- Days at 90°F or more
- 3
- Nights at 32°F or colder
- 3
- 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 USW00094012; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Havre in September?
On a given September day the chance of 0.01 inch or more is 23% on average, highest around September 6 (23%). In all, 1.06 in falls on 7 days of a normal September.
In a normal September in Havre, 3 days reach 90°F, 3 nights fall to freezing and snowfall averages 0.4 inches.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094012.
How humid and windy is Havre 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 41°F with 77% humidity. The wind averages 9.2 mph, most often from the west in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 41°F | 34°F | 77% | 7.6 mph | – |
| 9 a.m. | 50°F | 37°F | 60% | 9.8 mph | 71% |
| noon | 60°F | 37°F | 41% | 11.8 mph | 73% |
| 3 p.m. | 64°F | 35°F | 34% | 12.3 mph | – |
| 6 p.m. | 58°F | 36°F | 44% | 8.5 mph | – |
| 9 p.m. | 49°F | 35°F | 59% | 7.5 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00094012. 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 Havre?
The warmest September temperature on Havre's official record (since 1880) is 104°F, on September 7, 2022; the coldest is 18°F, on September 22, 1895. The wettest September brought 5.99 in (1911); the snowiest, 10.5 inches (2019).
The September mean against the 1991-2020 normal of 57.7°F: 2021 60.9°F (+3.2), 2022 63.5°F (+5.8), 2023 61.7°F (+4.0), 2024 63.5°F (+5.8), 2025 62.8°F (+5.1), 2026 59.2°F (+1.5). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 60.9°F | +3.2°F | 0.05 in |
| 2022 | 63.5°F | +5.8°F | 0.31 in |
| 2023 | 61.7°F | +4.0°F | 1.29 in |
| 2024 | 63.5°F | +5.8°F | 2.17 in |
| 2025 | 62.8°F | +5.1°F | 0.07 in |
| 2026 | 59.2°F | +1.5°F | 1.07 in |
Source: records: ACIS, NWS threaded record HVRthr; recent months: ACIS, station USW00094012. Records and recent months use complete months only.
How does September in Havre 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; Havre's is 73°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.