St. Helena Average Weather by Day

Data and chart of the the average high and low temperature for every day of the year in St. Helena, California, based on NOAA data.

Also see:

What's the hottest day of the year in St. Helena?

On average, August 4 is the hottest day of the year St. Helena, California. From 1991–2020, the average high temperature on August 4 was 89.2 °F and the average low was 55.8 °F.

What's the coldest day of the year in St. Helena?

On average, December 27 is the coldest day of the year St. Helena, California. From 1991–2020, the average high temperature on December 27 was 57.6 °F, and the average low was 38.5 °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)
Day	High	Low
January 1	57.9	38.7
January 2	57.9	38.8
January 3	58.0	38.9
January 4	58.1	38.9
January 5	58.2	39.0
January 6	58.3	39.0
January 7	58.3	39.1
January 8	58.4	39.2
January 9	58.5	39.3
January 10	58.6	39.5
January 11	58.7	39.6
January 12	58.7	39.6
January 13	58.8	39.7
January 14	58.9	39.7
January 15	59.1	39.7
January 16	59.2	39.8
January 17	59.3	39.8
January 18	59.4	39.9
January 19	59.5	40.1
January 20	59.7	40.2
January 21	59.9	40.3
January 22	60.1	40.3
January 23	60.3	40.4
January 24	60.4	40.4
January 25	60.6	40.5
January 26	60.8	40.5
January 27	60.9	40.5
January 28	60.9	40.5
January 29	61.1	40.5
January 30	61.3	40.6
January 31	61.5	40.7
February 1	61.6	40.7
February 2	61.8	40.8
February 3	61.8	40.9
February 4	61.8	41.0
February 5	61.8	41.1
February 6	61.9	41.1
February 7	62.1	41.1
February 8	62.2	41.2
February 9	62.3	41.2
February 10	62.5	41.2
February 11	62.5	41.2
February 12	62.6	41.3
February 13	62.7	41.4
February 14	62.7	41.4
February 15	62.7	41.5
February 16	62.8	41.6
February 17	62.8	41.6
February 18	62.8	41.7
February 19	62.8	41.7
February 20	62.8	41.7
February 21	62.9	41.7
February 22	63.0	41.7
February 23	63.1	41.7
February 24	63.3	41.8
February 25	63.5	41.9
February 26	63.8	42.0
February 27	63.9	42.1
February 28	64.1	42.2
March 1	64.2	42.3
March 2	64.3	42.4
March 3	64.5	42.5
March 4	64.8	42.5
March 5	65.1	42.6
March 6	65.5	42.7
March 7	65.7	42.8
March 8	65.8	43.0
March 9	65.8	43.1
March 10	65.9	43.2
March 11	66.0	43.2
March 12	66.1	43.2
March 13	66.3	43.3
March 14	66.5	43.4
March 15	66.8	43.5
March 16	67.1	43.6
March 17	67.3	43.6
March 18	67.5	43.7
March 19	67.7	43.8
March 20	68.0	43.9
March 21	68.2	44.0
March 22	68.4	44.0
March 23	68.5	44.1
March 24	68.6	44.2
March 25	68.6	44.3
March 26	68.6	44.3
March 27	68.6	44.3
March 28	68.6	44.4
March 29	68.7	44.4
March 30	68.8	44.4
March 31	68.9	44.4
April 1	68.9	44.4
April 2	69.0	44.5
April 3	69.1	44.5
April 4	69.2	44.5
April 5	69.5	44.5
April 6	69.7	44.6
April 7	70.0	44.7
April 8	70.3	44.9
April 9	70.6	45.1
April 10	70.9	45.3
April 11	71.1	45.4
April 12	71.3	45.5
April 13	71.6	45.6
April 14	71.8	45.7
April 15	71.9	45.8
April 16	72.2	45.9
April 17	72.6	46.0
April 18	72.8	46.2
April 19	73.1	46.4
April 20	73.4	46.5
April 21	73.7	46.7
April 22	73.9	46.8
April 23	74.1	47.0
April 24	74.5	47.2
April 25	74.7	47.3
April 26	75.0	47.4
April 27	75.3	47.5
April 28	75.5	47.6
April 29	75.7	47.8
April 30	76.0	48.0
May 1	76.2	48.1
May 2	76.4	48.3
May 3	76.5	48.5
May 4	76.7	48.6
May 5	76.9	48.7
May 6	77.1	48.8
May 7	77.3	48.9
May 8	77.4	49.0
May 9	77.7	49.1
May 10	77.8	49.3
May 11	77.8	49.4
May 12	77.9	49.5
May 13	78.0	49.7
May 14	78.1	49.8
May 15	78.2	49.9
May 16	78.3	50.0
May 17	78.5	50.1
May 18	78.7	50.2
May 19	78.9	50.4
May 20	79.1	50.5
May 21	79.3	50.7
May 22	79.5	50.8
May 23	79.6	50.9
May 24	79.8	50.9
May 25	80.0	51.1
May 26	80.2	51.3
May 27	80.4	51.4
May 28	80.6	51.6
May 29	80.9	51.7
May 30	81.2	51.8
May 31	81.5	52.0
June 1	81.8	52.1
June 2	82.1	52.2
June 3	82.3	52.3
June 4	82.6	52.5
June 5	82.8	52.6
June 6	83.1	52.7
June 7	83.4	52.8
June 8	83.7	52.8
June 9	84.0	53.0
June 10	84.3	53.1
June 11	84.6	53.2
June 12	84.8	53.3
June 13	85.1	53.5
June 14	85.3	53.6
June 15	85.4	53.7
June 16	85.6	53.8
June 17	85.8	53.9
June 18	86.0	54.0
June 19	86.2	54.0
June 20	86.5	54.1
June 21	86.7	54.2
June 22	86.9	54.4
June 23	87.1	54.4
June 24	87.3	54.5
June 25	87.5	54.6
June 26	87.7	54.6
June 27	87.7	54.7
June 28	87.8	54.8
June 29	88.0	54.8
June 30	88.1	54.9
July 1	88.3	55.0
July 2	88.3	55.0
July 3	88.4	55.1
July 4	88.5	55.2
July 5	88.5	55.2
July 6	88.5	55.3
July 7	88.5	55.4
July 8	88.6	55.4
July 9	88.6	55.5
July 10	88.7	55.6
July 11	88.8	55.6
July 12	88.9	55.6
July 13	89.0	55.6
July 14	89.0	55.6
July 15	89.0	55.6
July 16	89.0	55.6
July 17	89.0	55.6
July 18	89.1	55.7
July 19	89.1	55.7
July 20	89.2	55.7
July 21	89.2	55.7
July 22	89.1	55.8
July 23	89.0	55.8
July 24	88.9	55.8
July 25	88.9	55.8
July 26	89.0	55.8
July 27	89.0	55.8
July 28	89.0	55.8
July 29	89.0	55.8
July 30	89.0	55.7
July 31	89.1	55.7
August 1	89.1	55.8
August 2	89.2	55.8
August 3	89.2	55.8
August 4	89.2	55.8
August 5	89.3	55.7
August 6	89.1	55.7
August 7	89.0	55.6
August 8	89.0	55.6
August 9	88.9	55.6
August 10	88.9	55.6
August 11	88.8	55.6
August 12	88.8	55.5
August 13	88.8	55.5
August 14	88.9	55.5
August 15	88.9	55.5
August 16	88.9	55.5
August 17	88.8	55.5
August 18	88.9	55.4
August 19	88.9	55.4
August 20	89.0	55.4
August 21	89.0	55.4
August 22	89.1	55.3
August 23	89.2	55.3
August 24	89.2	55.2
August 25	89.2	55.1
August 26	89.1	55.1
August 27	89.0	55.0
August 28	88.8	54.9
August 29	88.8	54.9
August 30	88.6	54.8
August 31	88.4	54.8
September 1	88.2	54.7
September 2	88.0	54.5
September 3	87.9	54.4
September 4	87.9	54.4
September 5	87.8	54.3
September 6	87.8	54.2
September 7	87.7	54.1
September 8	87.6	54.0
September 9	87.5	53.8
September 10	87.5	53.7
September 11	87.3	53.6
September 12	87.2	53.6
September 13	87.1	53.4
September 14	87.0	53.4
September 15	86.8	53.3
September 16	86.6	53.2
September 17	86.3	53.1
September 18	86.1	52.9
September 19	85.8	52.8
September 20	85.5	52.7
September 21	85.1	52.6
September 22	84.8	52.4
September 23	84.6	52.3
September 24	84.5	52.1
September 25	84.4	52.0
September 26	84.1	51.9
September 27	83.8	51.7
September 28	83.6	51.5
September 29	83.5	51.3
September 30	83.4	51.2
October 1	83.2	51.1
October 2	83.0	51.1
October 3	82.8	50.9
October 4	82.5	50.8
October 5	82.2	50.6
October 6	81.9	50.5
October 7	81.7	50.3
October 8	81.4	50.2
October 9	81.1	50.0
October 10	80.8	49.9
October 11	80.4	49.8
October 12	80.0	49.7
October 13	79.8	49.5
October 14	79.4	49.3
October 15	78.9	49.1
October 16	78.6	48.9
October 17	78.2	48.8
October 18	77.9	48.7
October 19	77.6	48.4
October 20	77.4	48.3
October 21	77.0	48.1
October 22	76.6	47.9
October 23	76.1	47.8
October 24	75.6	47.7
October 25	75.2	47.5
October 26	74.8	47.3
October 27	74.3	47.1
October 28	73.8	47.0
October 29	73.3	46.8
October 30	73.0	46.6
October 31	72.6	46.4
November 1	72.2	46.3
November 2	71.8	46.1
November 3	71.4	46.0
November 4	71.0	45.7
November 5	70.5	45.6
November 6	70.0	45.5
November 7	69.5	45.4
November 8	69.0	45.1
November 9	68.6	44.8
November 10	68.1	44.5
November 11	67.6	44.3
November 12	67.2	44.1
November 13	66.9	43.9
November 14	66.5	43.7
November 15	66.2	43.5
November 16	65.8	43.2
November 17	65.4	43.0
November 18	65.1	42.8
November 19	64.7	42.7
November 20	64.3	42.6
November 21	64.0	42.4
November 22	63.6	42.2
November 23	63.3	42.1
November 24	63.1	41.9
November 25	62.9	41.9
November 26	62.7	41.8
November 27	62.4	41.6
November 28	62.0	41.5
November 29	61.6	41.3
November 30	61.3	41.2
December 1	61.0	41.0
December 2	60.7	40.8
December 3	60.4	40.7
December 4	60.2	40.5
December 5	60.1	40.3
December 6	59.8	40.1
December 7	59.6	40.0
December 8	59.4	39.9
December 9	59.2	39.8
December 10	59.1	39.6
December 11	58.9	39.5
December 12	58.7	39.3
December 13	58.6	39.2
December 14	58.4	39.2
December 15	58.3	39.2
December 16	58.2	39.2
December 17	58.1	39.2
December 18	58.0	39.1
December 19	58.0	39.0
December 20	57.9	38.9
December 21	57.9	38.8
December 22	57.9	38.7
December 23	57.8	38.6
December 24	57.8	38.5
December 25	57.7	38.5
December 26	57.6	38.6
December 27	57.6	38.5
December 28	57.7	38.5
December 29	57.8	38.5
December 30	57.9	38.6
December 31	57.9	38.7

Weather Station Details

Years	Station	Coordinates
1907–2023	Saint Helena	location