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90° 78° 66° 54° 42° Sep. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30. Avg. Hi.
In Belfast during September average daily high temperatures decrease from 73°F to 63°F and the fraction of time spent overcast or mostly cloudy increases from 37% to 41%.
In Belfast the weather in September is generally perfect, with pleasant temperatures and moderate rainfall. Daytime temperatures hover around 21°C ( show in °F ), while nights can cool down to about 10°C.
The average temperature in Belfast in September for a typical day ranges from a high of 70°F (21°C) to a low of 53°F (12°C). Some would describe it as mildly cool with a gentle breeze. For comparison, the hottest month in Belfast, July, has days with highs of 77°F (25°C) and lows of 60°F (16°C).
Averages and records for weather in Belfast, Maine in the month of September. Change city. Typical Belfast September Weather. 1991–2020. Average daily high. 70.5 °F. Average daily low. 48.8 °F. Average monthly precipitation.
The arrival of September in Belfast, Maine, suggests a slight decrease in the average high-temperature, moving from a moderately hot 73.9°F (23.3°C) in August to a comfortable 67.1°F (19.5°C). Belfast experiences a nighttime temperature average of 51.1°F (10.6°C) during September.
