Things to Do in Bangor in September
September weather, activities, events & insider tips
Low Season · Budget Friendly
September Weather in Bangor
Temperature, rainfall and humidity at a glance
71°F (22°C)
High Temp
55°F (13°C)
Low Temp
3.4 inches (86 mm)
Rainfall
70%
Humidity
⚠ UV index reaches 8 despite the cooling temperatures. September sun at this latitude feels mild but burns effectively, on exposed granite in Acadia National Park and on open water during whale watching excursions. The combination of wind and clear skies masks how much radiation your skin absorbs. Sunscreen and a hat are not optional.
⚠ Morning fog clings to the Penobscot River corridor and coastal routes to Bar Harbor. Visibility drops sharply before 9 AM. The river valley suffers worst. Cold overnight air hits warmer water head-on. Budget extra time for early drives east. Trails stay damp and slick until mid-morning. Wait for the burn-off.
What's On in Bangor in September
September in Bangor sees average highs of 22°C and average lows of 12°C, with average rainfall of 86 mm. The month is 4°C cooler than August and 7°C warmer than October, and drier than October. Visitors will experience daylight hours of 13 hours 11 minutes on 1 September and 12 hours 27 minutes on 15 September. Labor Day falls on Monday 6 September 2027.
September Climate Compared
| Month | Avg high | Avg low | Rainfall |
|---|---|---|---|
| August | 26°C | 16°C | 84 mm |
| September | 22°C | 12°C | 86 mm |
| October | 15°C | 7°C | 112 mm |
September is 4°C cooler than August; 7°C warmer than October; drier than October (86 mm vs 112 mm).
Long-run monthly averages. Source: Open-Meteo.
Daylight in September
Day length: 13 h 11 min on 1 September, 12 h 27 min on 15 September (−96 min compared with mid-August).
Computed from the city's coordinates (sunrise to sunset, standard solar geometry).
Public Holidays and Long Weekends
- Labor Day: Monday 6 September 2027 (3-day weekend (Sat–Mon))
Holiday dates: Nager.Date. Long-weekend notes are computed from the weekday.
Notable Places to Visit
Places within 8 km, ordered by Wikipedia coverage. Opening hours as mapped in OpenStreetMap (fetched 2026-10-16); check before you go. Data © OpenStreetMap contributors (ODbL); descriptions from Wikidata (CC0).
Quick Answers
How much rain does Bangor get in September?
On average 86 mm in September, drier than October (86 mm vs 112 mm).
How warm is Bangor in September?
Average highs are 22°C and average lows 12°C.
How long are the days in Bangor in September?
About 12 h 27 min of daylight on 15 September.
Are there public holidays in Bangor in September?
Yes: Labor Day on Monday 6 September 2027. 1 of them create a long weekend.
What are some notable places to visit in Bangor?
Thomas Hill Standpipe, All Souls Congregational Church, Bass Park, Battleship Maine Monument (from OpenStreetMap and Wikidata).
Where to Stay in Bangor in September
Hand-picked hotels across price tiers for September travellers.
Public Holidays in September
Dates that affect opening hours, transport and crowds
Labor Day
Known in English as Labour Day. Observed nationwide as a public holiday.
Labor Day
Known in English as Labour Day. Observed nationwide as a public holiday.
Labor Day
Known in English as Labour Day. Observed nationwide as a public holiday.
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