Bangor weather in September: Bangor, Maine: normal highs, lows, rain and records for September
Bangor in September has a normal high of 71°F and a normal low of 49°F, a daily mean of 60°F, falling from 76°F on the 1st to 65°F by the 30th. Measurable precipitation falls on 9 days in a normal September, 3.76 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 22°C and low of 9°C, 96 mm of precipitation in September.
- NOAA stationBangor International Airport
- Station IDUSW00014606
- Location44.80°N 68.82°W
- Elevation148 ft (45 m)
- Population32,446
- Jan 28° 9°
- Feb 31° 11°
- Mar 40° 21°
- Apr 53° 32°
- May 66° 43°
- Jun 75° 53°
- Jul 80° 59°
- Aug 79° 57°
- Sep 71° 49°
- Oct 58° 38°
- Nov 46° 29°
- Dec 35° 17°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Bangor in September?
The normal high is 71°F and the normal low 49°F, for a daily mean of 59.9°F. September is 8.3°F cooler than August and 11.7°F warmer than October. September is the 4th warmest month of the year in Bangor and the 4th wettest. Across the month the normal high falls 11°F, from 76°F on September 1 to 65°F on September 30. From one year to the next September's mean temperature typically moves about 2.5°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 57°F and 62°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 34%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 76°F | 54°F | 30% | 18% |
| September 8 | 74°F | 52°F | 31% | 19% |
| September 15 | 71°F | 49°F | 31% | 19% |
| September 22 | 68°F | 46°F | 33% | 20% |
| September 30 | 65°F | 43°F | 34% | 22% |
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 | 76°F | 54°F | 30% | 18% | 13 h 20 min |
| September 2 | 76°F | 54°F | 30% | 18% | 13 h 20 min |
| September 3 | 76°F | 53°F | 30% | 18% | 13 h 10 min |
| September 4 | 76°F | 53°F | 30% | 18% | 13 h 10 min |
| September 5 | 75°F | 53°F | 30% | 18% | 13 h 10 min |
| September 6 | 75°F | 52°F | 30% | 18% | 13 h |
| September 7 | 75°F | 52°F | 31% | 19% | 13 h |
| September 8 | 74°F | 52°F | 31% | 19% | 13 h |
| September 9 | 74°F | 51°F | 31% | 19% | 12 h 50 min |
| September 10 | 73°F | 51°F | 31% | 19% | 12 h 50 min |
| September 11 | 73°F | 51°F | 31% | 19% | 12 h 50 min |
| September 12 | 73°F | 50°F | 31% | 19% | 12 h 50 min |
| September 13 | 72°F | 50°F | 31% | 19% | 12 h 40 min |
| September 14 | 72°F | 50°F | 31% | 19% | 12 h 40 min |
| September 15 | 71°F | 49°F | 31% | 19% | 12 h 40 min |
| September 16 | 71°F | 49°F | 31% | 19% | 12 h 30 min |
| September 17 | 71°F | 48°F | 32% | 19% | 12 h 30 min |
| September 18 | 70°F | 48°F | 32% | 20% | 12 h 30 min |
| September 19 | 70°F | 48°F | 32% | 20% | 12 h 20 min |
| September 20 | 69°F | 47°F | 32% | 20% | 12 h 20 min |
| September 21 | 69°F | 47°F | 32% | 20% | 12 h 20 min |
| September 22 | 68°F | 46°F | 33% | 20% | 12 h 10 min |
| September 23 | 68°F | 46°F | 33% | 21% | 12 h 10 min |
| September 24 | 68°F | 46°F | 33% | 21% | 12 h 10 min |
| September 25 | 67°F | 45°F | 33% | 21% | 12 h 10 min |
| September 26 | 67°F | 45°F | 33% | 21% | 12 h |
| September 27 | 66°F | 45°F | 34% | 21% | 12 h |
| September 28 | 66°F | 44°F | 34% | 22% | 12 h |
| September 29 | 65°F | 44°F | 34% | 22% | 11 h 50 min |
| September 30 | 65°F | 43°F | 34% | 22% | 11 h 50 min |
- Normal high
- 71°FSeptember average
- Normal low
- 49°FSeptember average
- Precipitation
- 3.76 inmonth total
- Days with precipitation
- 90.01 inch or more
- Nights at 32°F or colder
- 1
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 17
- Days at 80°F or more
- 4
- Sunshine
- 77%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014606; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Bangor in September?
On a given September day the chance of 0.01 inch or more is 32% on average, highest around September 30 (34%). In all, 3.76 in falls on 9 days of a normal September, 1 of them with an inch or more.
In a normal September in Bangor, 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014606.
What are the records for September in Bangor?
The warmest September temperature on Bangor's official record (since 1925) is 99°F, on September 7, 1945; the coldest is 20°F, on September 19, 1930. The wettest September brought 9.88 in (1999).
The September mean against the 1991-2020 normal of 59.9°F: 2021 62.3°F (+2.4), 2022 60.2°F (+0.3), 2023 64.0°F (+4.1), 2024 61.5°F (+1.6), 2025 60.7°F (+0.8), 2026 59.1°F (−0.8). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 62.3°F | +2.4°F | 9.42 in |
| 2022 | 60.2°F | +0.3°F | 4.78 in |
| 2023 | 64.0°F | +4.1°F | 3.54 in |
| 2024 | 61.5°F | +1.6°F | 1.33 in |
| 2025 | 60.7°F | +0.8°F | 3.06 in |
| 2026 | 59.1°F | −0.8°F | 5.14 in |
Source: records: ACIS, NWS threaded record BGRthr; recent months: ACIS, station USW00014606. Records and recent months use complete months only.
How does September in Bangor compare across Maine?
Across the 42 places PlainClimate covers in Maine, September normal highs run from 66°F in Limestone to 73°F in Sanford; Bangor's is 71°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.