September weather forecast and climate
Bar Harbor, ME

What is the temperature in September in Bar Harbor?

In Bar Harbor, Maine, in September, the average high-temperature is 68°F (20°C), and the average low-temperature is 48.2°F (9°C).

How much does it rain in Bar Harbor in September?

In September, in Bar Harbor, the rain falls for 10 days. Throughout September, 4.4" (112mm) of precipitation is accumulated.
Average temperature in September - Bar Harbor, ME
  • Average high temperature in September: 68°F

The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (28°F).

  • Average low temperature in September: 48°F

Months with the highest average low temperature are July and August (57°F).
The coldest month (with the lowest average low temperature) is January (9°F).

Average rainfall in September - Bar Harbor, ME
  • Average rainfall in September: 4.4"

The wettest month (with the highest rainfall) is November (6").
The driest month (with the lowest rainfall) is August (2.9").

Average rainfall days in September - Bar Harbor, ME
  • Average rainfall days in September: 10 days

The month with the highest number of rainy days is December (14 days).
Months with the lowest number of rainy days are February and September (10 days).

Average sea temperature in September - Bar Harbor, ME
  • Average sea temperature in September: 55.9°F

The best month for swimming (with the highest average sea temperature) is August (56.8°F).
The coldest month (with the lowest average sea temperature) is March (38.6°F).

Average daylight in September / Average sunshine in September - Bar Harbor, ME
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.5h).
The month with shortest days is December (Average daylight: 8.9h).

  • Average sunshine in September: 6h

Months with most sunshine are June and July (Average sunshine: 8h).
The month with least sunshine is December (Average sunshine: 3h).

Average UV index in September - Bar Harbor, ME
  • Average UV index in September: 5

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January and December (UV index 1).

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