Boulder Average Weather by Day

Data and chart of the the average high and low temperature for every day of the year in Boulder, Colorado, based on NOAA data.
Also see:
What's the hottest day of the year in Boulder?
On average, July 18 is the hottest day of the year Boulder, Colorado. From 1991–2020, the average high temperature on July 18 was 87.9 °F and the average low was 57.7 °F.
What's the coldest day of the year in Boulder?
On average, December 30 is the coldest day of the year Boulder, Colorado. From 1991–2020, the average high temperature on December 30 was 45.5 °F, and the average low was 20.9 °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 45.6 20.9
January 2 45.7 21.0
January 3 45.7 21.0
January 4 45.8 21.0
January 5 46.0 21.1
January 6 46.2 21.3
January 7 46.4 21.5
January 8 46.5 21.7
January 9 46.6 21.7
January 10 46.6 21.8
January 11 46.7 21.8
January 12 46.8 21.8
January 13 46.9 21.9
January 14 47.0 21.9
January 15 47.0 22.1
January 16 47.2 22.1
January 17 47.1 22.2
January 18 47.1 22.2
January 19 47.1 22.2
January 20 47.1 22.3
January 21 47.1 22.3
January 22 47.1 22.3
January 23 47.0 22.3
January 24 47.0 22.2
January 25 47.1 22.3
January 26 47.1 22.2
January 27 47.2 22.3
January 28 47.2 22.3
January 29 47.2 22.2
January 30 47.3 22.3
January 31 47.5 22.4
February 1 47.5 22.5
February 2 47.6 22.5
February 3 47.5 22.5
February 4 47.5 22.5
February 5 47.6 22.5
February 6 47.6 22.5
February 7 47.7 22.7
February 8 47.7 22.8
February 9 47.7 22.8
February 10 47.7 22.9
February 11 47.7 22.8
February 12 47.7 22.7
February 13 47.8 22.7
February 14 47.9 22.8
February 15 48.0 22.9
February 16 48.2 22.9
February 17 48.5 23.1
February 18 48.8 23.3
February 19 49.0 23.5
February 20 49.3 23.8
February 21 49.5 23.9
February 22 49.8 24.1
February 23 50.0 24.3
February 24 50.4 24.5
February 25 50.8 24.8
February 26 51.2 25.1
February 27 51.6 25.5
February 28 51.9 25.7
March 1 52.1 25.9
March 2 52.4 26.3
March 3 52.7 26.7
March 4 52.9 26.8
March 5 53.2 27.0
March 6 53.5 27.2
March 7 53.9 27.4
March 8 54.2 27.7
March 9 54.7 27.9
March 10 55.0 28.2
March 11 55.2 28.3
March 12 55.6 28.7
March 13 55.9 29.0
March 14 56.3 29.3
March 15 56.6 29.6
March 16 56.8 29.7
March 17 57.2 30.0
March 18 57.5 30.3
March 19 57.7 30.5
March 20 57.9 30.7
March 21 58.1 30.7
March 22 58.4 31.1
March 23 58.7 31.3
March 24 58.9 31.5
March 25 59.1 31.7
March 26 59.3 31.8
March 27 59.4 31.9
March 28 59.5 32.0
March 29 59.7 32.1
March 30 59.9 32.2
March 31 60.0 32.3
April 1 60.2 32.4
April 2 60.4 32.6
April 3 60.5 32.7
April 4 60.7 32.9
April 5 60.8 33.1
April 6 60.9 33.3
April 7 60.9 33.4
April 8 61.1 33.6
April 9 61.4 33.9
April 10 61.6 34.1
April 11 61.8 34.3
April 12 62.0 34.4
April 13 62.3 34.6
April 14 62.5 34.9
April 15 62.7 35.1
April 16 62.7 35.2
April 17 62.7 35.3
April 18 63.0 35.5
April 19 63.1 35.8
April 20 63.4 35.9
April 21 63.6 36.2
April 22 64.0 36.4
April 23 64.2 36.7
April 24 64.3 37.0
April 25 64.6 37.2
April 26 64.9 37.5
April 27 65.1 37.7
April 28 65.2 37.9
April 29 65.5 38.2
April 30 65.8 38.4
May 1 66.2 38.7
May 2 66.6 39.1
May 3 66.9 39.4
May 4 67.3 39.7
May 5 67.7 40.0
May 6 68.0 40.3
May 7 68.4 40.6
May 8 68.7 40.9
May 9 68.9 41.1
May 10 69.2 41.4
May 11 69.4 41.7
May 12 69.7 41.9
May 13 70.0 42.2
May 14 70.3 42.6
May 15 70.8 42.9
May 16 71.2 43.3
May 17 71.6 43.6
May 18 72.0 44.0
May 19 72.3 44.3
May 20 72.7 44.5
May 21 72.9 44.8
May 22 73.2 45.0
May 23 73.6 45.3
May 24 74.0 45.6
May 25 74.4 45.9
May 26 74.8 46.2
May 27 75.2 46.6
May 28 75.6 46.9
May 29 75.9 47.1
May 30 76.2 47.3
May 31 76.5 47.6
June 1 76.8 47.8
June 2 77.0 47.9
June 3 77.3 48.2
June 4 77.7 48.4
June 5 78.0 48.7
June 6 78.3 49.0
June 7 78.7 49.3
June 8 79.2 49.6
June 9 79.7 49.9
June 10 80.1 50.2
June 11 80.5 50.5
June 12 80.9 50.7
June 13 81.3 51.0
June 14 81.7 51.3
June 15 82.1 51.6
June 16 82.4 51.8
June 17 82.7 52.0
June 18 83.0 52.3
June 19 83.3 52.5
June 20 83.6 52.8
June 21 83.9 53.0
June 22 84.2 53.3
June 23 84.5 53.5
June 24 84.7 53.8
June 25 85.0 54.0
June 26 85.2 54.3
June 27 85.5 54.5
June 28 85.8 54.7
June 29 86.0 54.9
June 30 86.2 55.2
July 1 86.5 55.4
July 2 86.7 55.6
July 3 86.9 55.8
July 4 87.1 55.9
July 5 87.4 56.2
July 6 87.6 56.4
July 7 87.7 56.5
July 8 87.9 56.7
July 9 87.9 56.9
July 10 88.0 57.0
July 11 88.1 57.2
July 12 88.0 57.3
July 13 88.0 57.4
July 14 88.0 57.5
July 15 88.0 57.5
July 16 87.9 57.6
July 17 87.9 57.7
July 18 87.9 57.7
July 19 87.9 57.7
July 20 87.8 57.8
July 21 87.8 57.8
July 22 87.7 57.8
July 23 87.6 57.8
July 24 87.6 57.8
July 25 87.6 57.8
July 26 87.6 57.8
July 27 87.5 57.8
July 28 87.4 57.8
July 29 87.3 57.7
July 30 87.3 57.6
July 31 87.2 57.6
August 1 87.1 57.4
August 2 86.9 57.3
August 3 86.8 57.2
August 4 86.6 57.1
August 5 86.4 56.9
August 6 86.4 56.8
August 7 86.3 56.7
August 8 86.3 56.6
August 9 86.2 56.6
August 10 86.2 56.5
August 11 86.2 56.5
August 12 86.2 56.4
August 13 86.2 56.4
August 14 86.1 56.3
August 15 86.0 56.2
August 16 86.0 56.1
August 17 85.9 56.0
August 18 85.8 55.8
August 19 85.8 55.7
August 20 85.8 55.6
August 21 85.7 55.5
August 22 85.6 55.4
August 23 85.4 55.2
August 24 85.2 55.0
August 25 85.0 54.7
August 26 84.8 54.5
August 27 84.6 54.3
August 28 84.4 54.2
August 29 84.2 54.0
August 30 83.9 53.8
August 31 83.7 53.5
September 1 83.5 53.3
September 2 83.3 53.1
September 3 83.2 52.9
September 4 82.8 52.7
September 5 82.5 52.4
September 6 82.2 52.0
September 7 81.8 51.7
September 8 81.3 51.2
September 9 80.9 50.9
September 10 80.4 50.5
September 11 80.1 50.1
September 12 79.8 49.7
September 13 79.5 49.4
September 14 79.1 49.0
September 15 78.8 48.7
September 16 78.5 48.5
September 17 78.1 48.1
September 18 77.7 47.8
September 19 77.2 47.5
September 20 76.7 47.1
September 21 76.2 46.7
September 22 75.7 46.3
September 23 75.3 46.0
September 24 75.0 45.6
September 25 74.6 45.3
September 26 74.0 44.8
September 27 73.7 44.4
September 28 73.3 44.1
September 29 72.9 43.8
September 30 72.5 43.4
October 1 72.1 43.0
October 2 71.7 42.6
October 3 71.4 42.2
October 4 71.0 41.9
October 5 70.7 41.5
October 6 70.4 41.3
October 7 70.2 41.0
October 8 69.8 40.7
October 9 69.5 40.5
October 10 69.1 40.1
October 11 68.6 39.8
October 12 68.0 39.4
October 13 67.6 39.0
October 14 67.0 38.6
October 15 66.5 38.2
October 16 65.9 37.7
October 17 65.3 37.3
October 18 64.8 36.9
October 19 64.3 36.5
October 20 63.9 36.1
October 21 63.6 35.8
October 22 63.2 35.5
October 23 62.7 35.2
October 24 62.5 35.0
October 25 62.3 34.8
October 26 61.9 34.6
October 27 61.5 34.2
October 28 61.0 33.9
October 29 60.5 33.5
October 30 60.1 33.3
October 31 59.6 33.0
November 1 59.1 32.6
November 2 58.7 32.3
November 3 58.2 32.0
November 4 57.9 31.7
November 5 57.5 31.5
November 6 57.3 31.2
November 7 57.0 30.9
November 8 56.7 30.7
November 9 56.3 30.4
November 10 56.0 30.1
November 11 55.6 29.9
November 12 55.3 29.6
November 13 55.0 29.2
November 14 54.7 29.0
November 15 54.5 28.8
November 16 54.3 28.5
November 17 54.1 28.4
November 18 53.8 28.2
November 19 53.6 27.9
November 20 53.2 27.6
November 21 52.8 27.2
November 22 52.3 26.8
November 23 51.8 26.4
November 24 51.4 26.0
November 25 51.0 25.7
November 26 50.9 25.5
November 27 50.7 25.4
November 28 50.4 25.2
November 29 50.3 25.1
November 30 50.1 25.0
December 1 49.8 24.8
December 2 49.5 24.5
December 3 49.1 24.2
December 4 48.7 23.9
December 5 48.3 23.5
December 6 48.0 23.3
December 7 47.8 23.1
December 8 47.5 22.8
December 9 47.2 22.6
December 10 47.0 22.3
December 11 46.8 22.1
December 12 46.7 22.0
December 13 46.6 21.9
December 14 46.5 21.9
December 15 46.3 21.8
December 16 46.2 21.7
December 17 46.0 21.5
December 18 45.8 21.4
December 19 45.7 21.3
December 20 45.8 21.3
December 21 45.8 21.3
December 22 45.8 21.2
December 23 45.8 21.1
December 24 45.9 21.1
December 25 45.9 21.2
December 26 45.9 21.2
December 27 45.8 21.1
December 28 45.7 21.0
December 29 45.6 21.0
December 30 45.5 20.9
December 31 45.6 20.9
Weather Station Details
Years Station Coordinates
1893–2024 Boulder location
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