What is the weather like in Acadia National Park vs Isle Royale National Park in September?

In September, Acadia National Park averages 18°C high / 11°C low with about 93 mm of rain; Isle Royale National Park averages 16°C high / 13°C low with about 84 mm.

Acadia National Park vs Isle Royale National Park in September

Acadia National Park is the better pick in September — 87 vs 81 on SeasonMap's comfort score. Acadia National Park is nice, rainy, clean air, while Isle Royale National Park is cool, rainy, clean air.

Acadia National Park vs Isle Royale National Park — September climate, side by side

	🇺🇸 Acadia National Park	🇺🇸 Isle Royale National Park
Comfort score	87/100 (A)	81/100 (A)
Feels-like high	18°C	14°C
Avg high / low	18° / 11°	16° / 13°
Rainfall	93 mm	84 mm
Rainy days	7	10
Humidity	81%	81%
Air quality (AQI)	37	37

Monthly climate normals (ERA5 reanalysis). Comfort scores are SeasonMap estimates.

Month by month

Acadia National Park vs Isle Royale National Park in September — FAQ

Is September better in Acadia National Park or Isle Royale National Park?: Acadia National Park is the better pick in September — 87 vs 81 on SeasonMap's comfort score. Acadia National Park is nice, rainy, clean air, while Isle Royale National Park is cool, rainy, clean air.
What is the weather like in Acadia National Park vs Isle Royale National Park in September?: In September, Acadia National Park averages 18°C high / 11°C low with about 93 mm of rain; Isle Royale National Park averages 16°C high / 13°C low with about 84 mm.