Portland Average Weather by Day

Data and chart of the the average high and low temperature for every day of the year in Portland, Maine, based on NOAA data.
Also see:
What's the hottest day of the year in Portland?
On average, July 27 is the hottest day of the year Portland, Maine. From 1991–2020, the average high temperature on July 27 was 79.7 °F and the average low was 60.8 °F.
What's the coldest day of the year in Portland?
On average, January 29 is the coldest day of the year Portland, Maine. From 1991–2020, the average high temperature on January 29 was 31.8 °F, and the average low was 13.9 °F.
Average Temperature by Day
  • Average temperatures from 1991–2020. Daily averages are a mean of the period from 14 days before to 14 days after, inclusive.
Day Average (°F)
High Low
January 1 34.6 17.7
January 2 34.3 17.5
January 3 34.2 17.3
January 4 34.0 17.1
January 5 33.8 16.9
January 6 33.5 16.7
January 7 33.2 16.3
January 8 32.9 15.9
January 9 32.6 15.6
January 10 32.6 15.5
January 11 32.5 15.3
January 12 32.2 15.1
January 13 32.1 14.8
January 14 32.1 14.8
January 15 32.1 14.8
January 16 32.0 14.8
January 17 32.0 14.7
January 18 31.9 14.6
January 19 31.9 14.5
January 20 31.9 14.5
January 21 32.0 14.4
January 22 32.1 14.5
January 23 32.1 14.4
January 24 32.1 14.3
January 25 32.0 14.3
January 26 32.0 14.2
January 27 32.0 14.0
January 28 31.8 14.0
January 29 31.8 13.9
January 30 31.8 13.9
January 31 32.0 13.9
February 1 32.1 13.9
February 2 32.2 14.0
February 3 32.4 14.0
February 4 32.5 14.1
February 5 32.8 14.4
February 6 33.1 14.7
February 7 33.4 15.1
February 8 33.6 15.3
February 9 33.8 15.4
February 10 34.0 15.7
February 11 34.1 16.0
February 12 34.2 16.1
February 13 34.3 16.3
February 14 34.5 16.4
February 15 34.7 16.6
February 16 34.9 16.8
February 17 35.1 17.1
February 18 35.2 17.2
February 19 35.3 17.4
February 20 35.4 17.6
February 21 35.6 17.8
February 22 35.9 18.2
February 23 36.3 18.5
February 24 36.6 18.9
February 25 36.8 19.2
February 26 37.1 19.5
February 27 37.4 19.9
February 28 37.7 20.4
March 1 38.0 20.9
March 2 38.2 21.2
March 3 38.5 21.5
March 4 38.7 21.7
March 5 38.9 22.0
March 6 39.1 22.2
March 7 39.2 22.3
March 8 39.3 22.5
March 9 39.5 22.7
March 10 39.7 22.9
March 11 39.9 23.2
March 12 40.3 23.5
March 13 40.7 23.8
March 14 41.1 24.3
March 15 41.5 24.7
March 16 41.9 25.1
March 17 42.3 25.4
March 18 42.7 25.8
March 19 43.0 26.2
March 20 43.4 26.5
March 21 43.7 26.9
March 22 44.1 27.2
March 23 44.3 27.5
March 24 44.7 27.8
March 25 45.0 28.1
March 26 45.3 28.3
March 27 45.7 28.6
March 28 46.1 28.9
March 29 46.5 29.2
March 30 46.9 29.4
March 31 47.5 29.8
April 1 48.0 30.2
April 2 48.4 30.6
April 3 48.9 30.9
April 4 49.3 31.3
April 5 49.7 31.6
April 6 50.3 32.0
April 7 50.8 32.4
April 8 51.2 32.7
April 9 51.7 33.2
April 10 52.1 33.5
April 11 52.4 33.8
April 12 52.6 34.0
April 13 52.9 34.2
April 14 53.1 34.3
April 15 53.4 34.5
April 16 53.7 34.7
April 17 54.2 35.0
April 18 54.6 35.4
April 19 55.0 35.7
April 20 55.5 36.1
April 21 55.9 36.5
April 22 56.2 36.9
April 23 56.6 37.2
April 24 57.1 37.6
April 25 57.4 38.0
April 26 57.7 38.4
April 27 58.1 38.8
April 28 58.3 39.0
April 29 58.4 39.3
April 30 58.6 39.5
May 1 58.9 39.9
May 2 59.1 40.2
May 3 59.5 40.5
May 4 59.7 40.8
May 5 59.9 41.1
May 6 60.2 41.3
May 7 60.6 41.6
May 8 60.9 41.9
May 9 61.2 42.2
May 10 61.6 42.5
May 11 62.0 42.9
May 12 62.4 43.3
May 13 62.8 43.6
May 14 63.1 44.0
May 15 63.5 44.4
May 16 63.9 44.7
May 17 64.2 45.0
May 18 64.5 45.3
May 19 64.8 45.6
May 20 65.0 45.8
May 21 65.2 46.0
May 22 65.3 46.3
May 23 65.5 46.6
May 24 65.9 46.8
May 25 66.3 47.1
May 26 66.6 47.4
May 27 67.0 47.7
May 28 67.5 48.1
May 29 67.9 48.5
May 30 68.2 48.9
May 31 68.5 49.2
June 1 68.8 49.5
June 2 69.0 49.8
June 3 69.4 50.1
June 4 69.7 50.5
June 5 69.9 50.8
June 6 70.3 51.1
June 7 70.7 51.5
June 8 71.0 51.8
June 9 71.2 52.1
June 10 71.5 52.4
June 11 71.9 52.7
June 12 72.3 53.1
June 13 72.6 53.5
June 14 72.9 53.7
June 15 73.1 54.0
June 16 73.4 54.3
June 17 73.7 54.6
June 18 74.1 54.9
June 19 74.5 55.3
June 20 74.9 55.6
June 21 75.3 55.9
June 22 75.7 56.2
June 23 75.8 56.5
June 24 75.9 56.8
June 25 76.1 57.0
June 26 76.4 57.2
June 27 76.6 57.4
June 28 76.8 57.5
June 29 77.1 57.8
June 30 77.4 58.0
July 1 77.7 58.3
July 2 77.9 58.6
July 3 78.1 58.8
July 4 78.2 59.0
July 5 78.3 59.2
July 6 78.5 59.3
July 7 78.7 59.5
July 8 78.9 59.6
July 9 79.0 59.8
July 10 79.0 59.9
July 11 79.0 60.0
July 12 79.0 60.1
July 13 79.1 60.2
July 14 79.1 60.3
July 15 79.2 60.4
July 16 79.3 60.4
July 17 79.3 60.5
July 18 79.4 60.6
July 19 79.4 60.7
July 20 79.5 60.8
July 21 79.5 60.8
July 22 79.5 60.9
July 23 79.6 60.8
July 24 79.6 60.7
July 25 79.6 60.8
July 26 79.7 60.8
July 27 79.7 60.8
July 28 79.7 60.8
July 29 79.6 60.8
July 30 79.5 60.7
July 31 79.5 60.7
August 1 79.4 60.6
August 2 79.3 60.5
August 3 79.3 60.5
August 4 79.2 60.4
August 5 79.1 60.4
August 6 79.0 60.2
August 7 78.9 60.0
August 8 78.9 60.0
August 9 78.8 59.9
August 10 78.8 59.8
August 11 78.7 59.6
August 12 78.7 59.5
August 13 78.7 59.4
August 14 78.6 59.3
August 15 78.5 59.1
August 16 78.4 59.0
August 17 78.3 58.8
August 18 78.1 58.5
August 19 77.9 58.3
August 20 77.8 58.1
August 21 77.7 58.0
August 22 77.5 57.8
August 23 77.3 57.6
August 24 77.1 57.5
August 25 77.0 57.4
August 26 76.8 57.2
August 27 76.6 57.0
August 28 76.4 56.7
August 29 76.2 56.4
August 30 76.0 56.1
August 31 75.8 55.9
September 1 75.5 55.6
September 2 75.2 55.3
September 3 74.9 55.0
September 4 74.7 54.8
September 5 74.4 54.5
September 6 74.1 54.1
September 7 73.9 53.8
September 8 73.6 53.6
September 9 73.4 53.4
September 10 73.0 53.0
September 11 72.5 52.6
September 12 72.1 52.3
September 13 71.9 52.1
September 14 71.5 51.9
September 15 71.1 51.6
September 16 70.7 51.2
September 17 70.3 50.9
September 18 70.0 50.5
September 19 69.6 50.1
September 20 69.2 49.8
September 21 68.9 49.5
September 22 68.4 49.0
September 23 68.0 48.5
September 24 67.6 48.0
September 25 67.3 47.7
September 26 67.0 47.4
September 27 66.7 47.2
September 28 66.2 46.8
September 29 65.8 46.3
September 30 65.4 46.0
October 1 65.0 45.7
October 2 64.7 45.4
October 3 64.3 45.0
October 4 64.0 44.6
October 5 63.6 44.3
October 6 63.2 44.0
October 7 62.8 43.6
October 8 62.3 43.2
October 9 61.8 42.9
October 10 61.5 42.6
October 11 61.2 42.2
October 12 60.7 41.7
October 13 60.3 41.3
October 14 59.9 40.9
October 15 59.5 40.6
October 16 59.2 40.3
October 17 58.9 40.0
October 18 58.5 39.7
October 19 58.1 39.4
October 20 57.8 39.2
October 21 57.4 38.8
October 22 57.0 38.6
October 23 56.7 38.4
October 24 56.3 38.1
October 25 55.9 37.7
October 26 55.5 37.3
October 27 55.2 37.1
October 28 54.8 36.8
October 29 54.4 36.4
October 30 54.0 36.0
October 31 53.6 35.6
November 1 53.3 35.4
November 2 53.0 35.1
November 3 52.6 34.8
November 4 52.1 34.4
November 5 51.7 34.0
November 6 51.4 33.6
November 7 51.2 33.3
November 8 50.7 33.0
November 9 50.3 32.6
November 10 49.9 32.3
November 11 49.5 32.0
November 12 49.2 31.7
November 13 48.9 31.4
November 14 48.6 31.2
November 15 48.3 31.0
November 16 47.9 30.6
November 17 47.6 30.4
November 18 47.3 30.1
November 19 47.0 29.9
November 20 46.7 29.6
November 21 46.2 29.1
November 22 45.8 28.8
November 23 45.4 28.4
November 24 44.9 28.0
November 25 44.5 27.7
November 26 44.1 27.3
November 27 43.8 27.1
November 28 43.5 26.8
November 29 43.1 26.5
November 30 42.7 26.2
December 1 42.3 25.9
December 2 42.0 25.6
December 3 41.6 25.4
December 4 41.3 25.1
December 5 40.9 24.6
December 6 40.5 24.3
December 7 40.2 24.0
December 8 40.0 23.9
December 9 39.8 23.7
December 10 39.7 23.6
December 11 39.4 23.3
December 12 39.1 22.9
December 13 38.8 22.6
December 14 38.5 22.3
December 15 38.3 22.0
December 16 37.9 21.5
December 17 37.5 21.1
December 18 37.2 20.8
December 19 36.9 20.5
December 20 36.6 20.2
December 21 36.4 20.0
December 22 36.2 19.7
December 23 36.1 19.7
December 24 35.9 19.5
December 25 35.6 19.3
December 26 35.4 19.0
December 27 35.2 18.8
December 28 35.0 18.5
December 29 34.9 18.4
December 30 34.9 18.2
December 31 34.7 18.0
Weather Station Details
Years Station Coordinates
1940–2024 Portland International JetPort location
1871–1940 Portland location
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