Napa Average Weather by Day

Data and chart of the the average high and low temperature for every day of the year in Napa, California, based on NOAA data.
Also see:
What's the hottest day of the year in Napa?
On average, August 23 is the hottest day of the year Napa, California. From 1991–2020, the average high temperature on August 23 was 81.2 °F and the average low was 53.3 °F.
What's the coldest day of the year in Napa?
On average, December 28 is the coldest day of the year Napa, California. From 1991–2020, the average high temperature on December 28 was 56.4 °F, and the average low was 37.0 °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 56.4 37.1
January 2 56.4 37.1
January 3 56.5 37.2
January 4 56.5 37.4
January 5 56.6 37.4
January 6 56.6 37.5
January 7 56.6 37.6
January 8 56.7 37.7
January 9 56.7 37.8
January 10 56.8 37.9
January 11 56.8 38.0
January 12 56.9 38.0
January 13 57.0 38.1
January 14 57.0 38.0
January 15 57.1 38.1
January 16 57.2 38.1
January 17 57.3 38.2
January 18 57.5 38.2
January 19 57.6 38.3
January 20 57.8 38.3
January 21 58.0 38.4
January 22 58.2 38.4
January 23 58.4 38.4
January 24 58.6 38.5
January 25 58.7 38.6
January 26 58.9 38.6
January 27 59.1 38.6
January 28 59.2 38.7
January 29 59.4 38.7
January 30 59.6 38.8
January 31 59.8 38.8
February 1 59.9 38.9
February 2 60.0 38.9
February 3 60.1 39.0
February 4 60.2 39.0
February 5 60.3 39.1
February 6 60.4 39.1
February 7 60.5 39.2
February 8 60.6 39.2
February 9 60.7 39.2
February 10 60.9 39.2
February 11 61.0 39.3
February 12 61.0 39.4
February 13 61.1 39.4
February 14 61.2 39.4
February 15 61.3 39.5
February 16 61.3 39.6
February 17 61.4 39.7
February 18 61.4 39.7
February 19 61.5 39.8
February 20 61.5 39.9
February 21 61.6 39.8
February 22 61.7 39.7
February 23 61.8 39.7
February 24 61.9 39.7
February 25 62.1 39.8
February 26 62.2 39.9
February 27 62.4 40.0
February 28 62.5 40.1
March 1 62.6 40.2
March 2 62.8 40.3
March 3 62.9 40.3
March 4 63.1 40.4
March 5 63.4 40.4
March 6 63.6 40.5
March 7 63.7 40.7
March 8 63.8 40.7
March 9 63.9 40.8
March 10 64.0 40.9
March 11 64.0 41.0
March 12 64.1 41.0
March 13 64.2 41.0
March 14 64.4 41.1
March 15 64.6 41.2
March 16 64.8 41.2
March 17 65.0 41.2
March 18 65.1 41.3
March 19 65.3 41.4
March 20 65.4 41.4
March 21 65.5 41.5
March 22 65.6 41.6
March 23 65.7 41.7
March 24 65.7 41.8
March 25 65.7 41.8
March 26 65.7 41.9
March 27 65.8 41.9
March 28 65.8 42.0
March 29 65.8 42.0
March 30 65.9 42.0
March 31 66.0 41.9
April 1 66.0 41.9
April 2 66.1 42.0
April 3 66.2 42.0
April 4 66.3 42.0
April 5 66.5 42.0
April 6 66.7 42.1
April 7 66.9 42.1
April 8 67.1 42.2
April 9 67.4 42.4
April 10 67.6 42.5
April 11 67.7 42.7
April 12 67.9 42.7
April 13 68.1 42.8
April 14 68.2 42.9
April 15 68.4 43.1
April 16 68.7 43.1
April 17 68.9 43.2
April 18 69.2 43.4
April 19 69.4 43.5
April 20 69.6 43.7
April 21 69.8 43.8
April 22 70.0 44.0
April 23 70.3 44.1
April 24 70.5 44.3
April 25 70.7 44.4
April 26 70.9 44.5
April 27 71.1 44.6
April 28 71.3 44.6
April 29 71.5 44.8
April 30 71.6 45.0
May 1 71.8 45.2
May 2 72.0 45.4
May 3 72.1 45.6
May 4 72.2 45.7
May 5 72.3 45.8
May 6 72.5 45.9
May 7 72.7 46.1
May 8 72.8 46.2
May 9 73.0 46.3
May 10 73.0 46.5
May 11 73.1 46.7
May 12 73.0 46.9
May 13 73.1 47.0
May 14 73.1 47.1
May 15 73.1 47.3
May 16 73.1 47.4
May 17 73.3 47.6
May 18 73.5 47.7
May 19 73.7 47.9
May 20 73.8 48.0
May 21 74.0 48.2
May 22 74.1 48.3
May 23 74.2 48.4
May 24 74.4 48.5
May 25 74.6 48.7
May 26 74.8 48.9
May 27 75.0 49.1
May 28 75.3 49.3
May 29 75.5 49.4
May 30 75.8 49.4
May 31 76.0 49.5
June 1 76.1 49.7
June 2 76.3 49.7
June 3 76.5 49.9
June 4 76.7 50.1
June 5 76.9 50.3
June 6 77.2 50.4
June 7 77.4 50.4
June 8 77.6 50.5
June 9 77.7 50.6
June 10 78.0 50.7
June 11 78.2 50.8
June 12 78.4 51.0
June 13 78.6 51.1
June 14 78.7 51.3
June 15 78.8 51.4
June 16 79.0 51.5
June 17 79.1 51.6
June 18 79.1 51.7
June 19 79.3 51.8
June 20 79.3 51.9
June 21 79.4 52.0
June 22 79.4 52.1
June 23 79.5 52.2
June 24 79.6 52.3
June 25 79.7 52.3
June 26 79.7 52.4
June 27 79.6 52.6
June 28 79.6 52.7
June 29 79.7 52.8
June 30 79.7 52.9
July 1 79.8 53.0
July 2 79.8 53.1
July 3 79.8 53.1
July 4 79.8 53.2
July 5 79.8 53.4
July 6 79.7 53.5
July 7 79.8 53.6
July 8 79.8 53.7
July 9 79.8 53.8
July 10 79.9 53.8
July 11 79.9 53.8
July 12 79.9 53.8
July 13 79.8 53.8
July 14 79.8 53.9
July 15 79.7 53.9
July 16 79.6 54.0
July 17 79.7 54.0
July 18 79.7 54.0
July 19 79.8 54.0
July 20 79.8 54.1
July 21 79.8 54.1
July 22 79.7 54.2
July 23 79.6 54.2
July 24 79.6 54.3
July 25 79.6 54.3
July 26 79.7 54.3
July 27 79.8 54.3
July 28 79.8 54.2
July 29 79.9 54.2
July 30 79.9 54.2
July 31 80.0 54.2
August 1 80.0 54.2
August 2 80.1 54.2
August 3 80.1 54.1
August 4 80.1 54.1
August 5 80.0 54.1
August 6 79.9 54.1
August 7 79.9 54.0
August 8 79.9 54.1
August 9 79.9 54.1
August 10 80.0 54.1
August 11 80.0 54.1
August 12 80.1 54.0
August 13 80.3 54.0
August 14 80.4 53.9
August 15 80.5 53.9
August 16 80.4 53.9
August 17 80.5 53.8
August 18 80.6 53.7
August 19 80.8 53.6
August 20 80.9 53.6
August 21 80.9 53.5
August 22 81.1 53.4
August 23 81.2 53.3
August 24 81.3 53.2
August 25 81.3 53.2
August 26 81.2 53.2
August 27 81.1 53.1
August 28 81.1 53.0
August 29 81.1 53.0
August 30 81.0 52.9
August 31 80.8 52.9
September 1 80.7 52.7
September 2 80.7 52.6
September 3 80.8 52.4
September 4 81.0 52.3
September 5 81.0 52.1
September 6 81.1 52.0
September 7 81.1 51.9
September 8 81.1 51.7
September 9 81.1 51.5
September 10 81.2 51.4
September 11 81.2 51.3
September 12 81.1 51.3
September 13 81.1 51.1
September 14 81.1 51.0
September 15 81.0 50.9
September 16 80.9 50.7
September 17 80.7 50.6
September 18 80.5 50.5
September 19 80.4 50.3
September 20 80.1 50.2
September 21 79.9 50.1
September 22 79.7 49.9
September 23 79.7 49.7
September 24 79.7 49.5
September 25 79.7 49.4
September 26 79.5 49.2
September 27 79.3 49.0
September 28 79.3 48.8
September 29 79.4 48.6
September 30 79.5 48.5
October 1 79.4 48.4
October 2 79.3 48.4
October 3 79.1 48.2
October 4 78.9 48.0
October 5 78.7 47.9
October 6 78.5 47.7
October 7 78.4 47.5
October 8 78.1 47.4
October 9 77.8 47.3
October 10 77.5 47.1
October 11 77.2 46.9
October 12 77.0 46.8
October 13 76.7 46.6
October 14 76.5 46.4
October 15 76.2 46.3
October 16 75.9 46.0
October 17 75.6 45.9
October 18 75.4 45.7
October 19 75.3 45.5
October 20 75.0 45.4
October 21 74.7 45.2
October 22 74.4 45.0
October 23 74.0 44.9
October 24 73.6 44.7
October 25 73.3 44.6
October 26 72.9 44.4
October 27 72.4 44.2
October 28 72.0 44.0
October 29 71.6 43.8
October 30 71.2 43.6
October 31 70.9 43.4
November 1 70.5 43.3
November 2 70.2 43.2
November 3 69.8 43.0
November 4 69.5 42.8
November 5 69.0 42.6
November 6 68.6 42.5
November 7 68.2 42.4
November 8 67.8 42.2
November 9 67.4 41.9
November 10 67.0 41.7
November 11 66.6 41.4
November 12 66.3 41.2
November 13 65.9 41.0
November 14 65.7 40.9
November 15 65.3 40.7
November 16 64.9 40.5
November 17 64.6 40.4
November 18 64.2 40.2
November 19 63.9 40.1
November 20 63.5 40.0
November 21 63.2 39.9
November 22 62.8 39.7
November 23 62.5 39.6
November 24 62.3 39.5
November 25 62.1 39.4
November 26 61.9 39.3
November 27 61.5 39.3
November 28 61.2 39.2
November 29 60.8 39.1
November 30 60.5 39.0
December 1 60.2 38.8
December 2 59.9 38.7
December 3 59.7 38.6
December 4 59.5 38.4
December 5 59.3 38.2
December 6 59.0 38.0
December 7 58.8 38.0
December 8 58.6 37.9
December 9 58.5 37.8
December 10 58.2 37.8
December 11 58.0 37.7
December 12 57.9 37.6
December 13 57.8 37.5
December 14 57.6 37.4
December 15 57.5 37.4
December 16 57.4 37.4
December 17 57.3 37.4
December 18 57.2 37.3
December 19 57.1 37.3
December 20 57.0 37.2
December 21 57.0 37.1
December 22 56.9 37.1
December 23 56.8 37.0
December 24 56.7 37.0
December 25 56.5 37.0
December 26 56.5 37.0
December 27 56.5 37.0
December 28 56.4 37.0
December 29 56.4 37.0
December 30 56.5 37.0
December 31 56.5 37.1
Weather Station Details
Years Station Coordinates
1999–2024 Napa County Airport location
1901–1998 Napa State Hospital location
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