Bar Harbor weather in September 2025

Q: How hot is it in Bar Harbor in September?

Daytime temperatures usually reach 20°C in Bar Harbor in September, falling to 9°C at night.

Q: How sunny is it in Bar Harbor in September?

There are normally 6 hours of bright sunshine each day in Bar Harbor in September - that's 50% of daylight hours.

Q: How warm is the sea around Bar Harbor in September?

The average sea temperature around Bar Harbor in September is 12°C.

Q: Does it rain in Bar Harbor in September?

There are usually 10 days with some rain in Bar Harbor in September and the average monthly rainfall is 112mm.

Q: What is the chance of a cyclone in Bar Harbor in September?

On average less than 1 day in September in Bar Harbor is likely to be affected by the passage of one or more tropical storms.

Expect 20°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Bar Harbor in September. Check more long-term weather averages for Bar Harbor in September before you book your next holiday to Maine in 2025/2026.

20
20°C max day temperature
6
6 hours of sunshine per day
10
10 days with some rainfall
9
9°C min night temperature
12
12 hours of daylight per day
0
No heat & humidity
112
112 mm of monthly rainfall
5
5 (Moderate) UV index
12
12°C sea temperature

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The September weather guide for Maine (Bar Harbor) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm) | Imperial (°F / inches)

More about the USA

How hot is it in Bar Harbor in September?

Daytime temperatures usually reach 20°C in Bar Harbor in September, falling to 9°C at night.

How sunny is it in Bar Harbor in September?

There are normally 6 hours of bright sunshine each day in Bar Harbor in September - that's 50% of daylight hours.

How warm is the sea around Bar Harbor in September?

The average sea temperature around Bar Harbor in September is 12°C.

Does it rain in Bar Harbor in September?

There are usually 10 days with some rain in Bar Harbor in September and the average monthly rainfall is 112mm.

What is the chance of a hurricane in Bar Harbor in September?

On average less than 1 day in September in Bar Harbor is likely to be affected by the passage of one or more tropical storms.

Bar Harbor September sunrise & sunset times

Browse the sunrise and sunset times for Bar Harbor in September 2025. Select a month to view Bar Harbor sunrise and sunset times for the next 12 months.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Date	Sunrise times	Sunset times
Monday, 1st September 2025	04:56	18:09
Monday, 15th September 2025	05:12	17:43
Tuesday, 30th September 2025	05:30	17:15

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Maine - quick facts
Flight time^✝	11 hours
Time difference	UK -5 hours
Language(s)	English
Currency	US Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes
Why visit?	Nature
Tourist info	Maine Office of Tourism