September · United States
Best time to visit Bar Harbor in September Weather, crowds & prices
Weather in Bar Harbor in September
Average temperature 16°C, 105 mm of rain, about 14 days with 6+ hours of sunshine and 84% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
7.3/10
Ranked #5 of 12 months
- Avg temp
- 16°C
- Rainfall
- 105 mm
- Humidity
- 84%
- Days with 6h+ sun
- 14
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Bar Harbor scores 7.3/10 for nature and wildlife travel - an above-average month (#5 of 12). Expect around 16°C, 105 mm of rain, and roughly 14 days with 6+ hours of sunshine this month.
Bar Harbor is a nature and wildlife destination in United States. Its setting includes Coastal Maine village serving as the primary gateway to Acadia National Park and lobster dining.
September holds up well in Bar Harbor — 5th best month
September averages 16°C (61°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
At 105 mm this is a genuinely wet month: about 14 days with 6+ hours of sunshine in total, and outdoor plans need an indoor fallback.
It scores 7.3/10 here, 5th of 12 months, against 8.5/10 in the destination's best month.
Pack layers you can shed by midday plus one warm layer for the evening, a proper rain shell rather than an umbrella, footwear you can get muddy.
Figure on mid-season pricing, with crowds are moderate.
Frequently asked
- What is the weather like in Bar Harbor in September?
- In September, Bar Harbor averages 16°C, 105 mm of rain, and about 14 days with 6+ hours of sunshine. Its climate-comfort score is 7.3/10.
- Is September a good time to visit Bar Harbor?
- September earns a 7.3/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Bar Harbor in September?
- Expect about 105 mm of rain in September. Average humidity is 84% and there are about 14 days with 6+ hours of sunshine.
Curated in Bar Harbor
Tickets & experiences
Things to do in Bar Harbor
Bar Harbor, United States. Live activities and tours from GetYourGuide, matched to this destination.