UV indexIn Bar Harbor, the average daily maximum UV index in September is 4. SunshineIn Bar Harbor, the average sunshine in September is 8.2h. On the last day of the month, sunrise is at 6:29 am and sunset at 6:16 pm EDT. On the first day of September in Bar Harbor, sunrise is at 5:55 am and sunset at 7:10 pm. DaylightIn September, the average length of the day is 12h and 30min. Unprotected immersion in temperatures below 50☏ (10☌) causes quickly maximum intensity cold shock with hyperventilation. Note: Swimming in 55.9☏ (13.3☌) is considered dangerous. Ocean temperatureIn September, the average ocean temperature is 55.9☏ (13.3☌). SnowfallIn Bar Harbor, snow does not fall in June through September. In Bar Harbor, during the entire year, the rain falls for 142.1 days and collects up to 32.28" (820mm) of precipitation. Throughout September, 1.81" (46mm) of precipitation is accumulated. Rainfall In September, in Bar Harbor, the rain falls for 10.5 days.
HumidityThe average relative humidity in September in Bar Harbor is 79%. In September, the average low-temperature is 52.7☏ (11.5☌). TemperatureIn Bar Harbor, Maine, the average high-temperature in September slightly decreases from a moderately hot 73.4☏ (23☌) in August to an enjoyable 67.1☏ (19.5☌). September, the first month of the autumn in Bar Harbor, is still a comfortable month, with an average temperature varying between 67.1☏ (19.5☌) and 52.7☏ (11.5☌).
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