Portland, ME Climate

Summary Graph

The summary climate graph for Portland, ME shows a selection of temperature, rainfall and snow minimum, mean and maximum measures over the course of a year. Click on each of the measures in the key to toggle them on and off.

Graph of average and extreme temperature ranges by day for Portland, ME.

Temperature

The warmest month in Portland International Jetport, Portland, Maine is July with an average high temperature of 80.8°F. The hottest day on record was August 2 1975 when the temperature hit 102.9°F. During January the overnight temperature drops to an average of 13.1°F with the lowest temperature of -20.9°F being recorded on February 11 1983.

Warmest Days

Warmest Months

Coldest Days

Coldest Months

The warmest days on record are:

2 Aug 1975102.9°F
23 Jul 2011100°F
28 Jun 199198.1°F
18 Aug 198797°F
16 Jun 198897°F

The warmest months on average were:

July 201185.1°F
July 199485°F
July 201084.1°F
August 198084°F
July 200683.6°F

The coldest days on record are:

11 Feb 1983-20.9°F
20 Dec 1975-20°F
11 Jan 1976-20°F
26 Dec 1980-20°F
22 Jan 1984-18.9°F

The coldest months on average were:

January 19771.2°F
December 19891.3°F
January 19812.1°F
January 19823.7°F
January 19944.5°F

Rain

The wettest month by average rainfall in Portland, ME is April with an average of 5.2 inches of rain falling on 13 to 14 days.Although in May it typically rains on more days with 4.5 inches falling in 14 to 15 days. The driest month in Portland, ME is February with an average of 3.3 inches of rain falling on 5 to 6 days.

Wettest Days

The wettest days on record are:

4 September 199212.3 inches
7 September 20085.5 inches
24 September 19944.4 inches
17 September 19994.4 inches
23 September 19811.9 inches

Wettest Months

The wettest months on record are:

September 199237.8 inches
August 199232.7 inches
July 199230.9 inches
April 197330.5 inches
May 197325.1 inches

Driest Months

The driest months on record are:

February 19870.1 inches
January 20040.2 inches
April 19990.3 inches
August 19950.5 inches
May 19750.6 inches
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