Charleston Average Weather by Day

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

Also see:

What's the hottest day of the year in Charleston?

On average, July 15 is the hottest day of the year Charleston, Illinois. From 1991–2020, the average high temperature on July 15 was 87.4 °F and the average low was 66.5 °F.

What's the coldest day of the year in Charleston?

On average, January 17 is the coldest day of the year Charleston, Illinois. From 1991–2020, the average high temperature on January 17 was 37.0 °F, and the average low was 20.7 °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	38.8	23.0
January 2	38.7	22.8
January 3	38.6	22.7
January 4	38.3	22.4
January 5	38.1	22.1
January 6	37.8	21.9
January 7	37.7	21.7
January 8	37.7	21.7
January 9	37.8	21.8
January 10	37.7	21.7
January 11	37.5	21.5
January 12	37.3	21.3
January 13	37.2	21.2
January 14	37.2	21.1
January 15	37.1	21.0
January 16	37.0	20.9
January 17	37.0	20.7
January 18	37.0	20.8
January 19	37.0	20.8
January 20	37.2	20.8
January 21	37.4	20.8
January 22	37.4	20.9
January 23	37.5	20.9
January 24	37.6	21.0
January 25	37.6	21.0
January 26	37.6	20.9
January 27	37.6	20.9
January 28	37.7	20.9
January 29	37.8	21.0
January 30	37.9	21.1
January 31	38.1	21.3
February 1	38.3	21.3
February 2	38.6	21.6
February 3	38.8	21.8
February 4	39.2	22.0
February 5	39.5	22.3
February 6	39.9	22.5
February 7	40.2	22.8
February 8	40.5	23.1
February 9	41.0	23.4
February 10	41.3	23.7
February 11	41.6	23.9
February 12	41.7	24.1
February 13	42.0	24.2
February 14	42.4	24.5
February 15	42.8	24.9
February 16	43.0	25.1
February 17	43.1	25.2
February 18	43.3	25.2
February 19	43.6	25.5
February 20	44.0	25.9
February 21	44.4	26.2
February 22	44.8	26.4
February 23	45.2	26.8
February 24	45.5	27.1
February 25	45.8	27.3
February 26	46.2	27.6
February 27	46.8	28.0
February 28	47.3	28.5
March 1	47.8	28.8
March 2	48.3	29.2
March 3	48.8	29.6
March 4	49.3	30.0
March 5	49.6	30.3
March 6	50.0	30.6
March 7	50.2	30.9
March 8	50.5	31.0
March 9	50.8	31.3
March 10	51.2	31.6
March 11	51.5	31.9
March 12	51.8	32.2
March 13	52.3	32.5
March 14	52.8	32.9
March 15	53.1	33.3
March 16	53.5	33.6
March 17	54.1	34.0
March 18	54.7	34.4
March 19	55.3	34.9
March 20	55.8	35.4
March 21	56.3	35.7
March 22	56.6	35.9
March 23	57.0	36.3
March 24	57.5	36.6
March 25	58.0	37.1
March 26	58.5	37.5
March 27	58.9	37.9
March 28	59.3	38.2
March 29	59.8	38.5
March 30	60.1	38.9
March 31	60.6	39.2
April 1	61.0	39.6
April 2	61.4	40.0
April 3	61.9	40.4
April 4	62.5	40.6
April 5	62.9	41.1
April 6	63.4	41.4
April 7	63.7	41.7
April 8	64.0	41.9
April 9	64.4	42.2
April 10	64.9	42.5
April 11	65.2	42.8
April 12	65.5	43.2
April 13	65.9	43.5
April 14	66.1	43.7
April 15	66.4	44.0
April 16	66.8	44.4
April 17	67.0	44.7
April 18	67.2	45.0
April 19	67.5	45.3
April 20	67.8	45.7
April 21	68.2	45.9
April 22	68.5	46.2
April 23	68.9	46.6
April 24	69.3	47.0
April 25	69.8	47.4
April 26	70.1	47.8
April 27	70.4	48.2
April 28	70.7	48.5
April 29	70.7	48.7
April 30	70.9	48.9
May 1	71.2	49.2
May 2	71.4	49.5
May 3	71.6	49.8
May 4	71.9	50.0
May 5	72.2	50.3
May 6	72.6	50.7
May 7	72.9	51.0
May 8	73.3	51.3
May 9	73.7	51.7
May 10	74.2	52.0
May 11	74.5	52.4
May 12	74.8	52.7
May 13	75.2	53.1
May 14	75.6	53.6
May 15	76.0	53.9
May 16	76.4	54.3
May 17	76.7	54.7
May 18	77.1	55.0
May 19	77.5	55.4
May 20	77.7	55.6
May 21	77.9	55.8
May 22	78.1	56.0
May 23	78.2	56.2
May 24	78.5	56.4
May 25	78.7	56.6
May 26	79.0	56.9
May 27	79.4	57.3
May 28	79.8	57.7
May 29	80.2	58.1
May 30	80.5	58.5
May 31	80.8	58.7
June 1	81.1	59.0
June 2	81.3	59.3
June 3	81.6	59.7
June 4	82.0	60.1
June 5	82.3	60.4
June 6	82.6	60.8
June 7	82.8	61.1
June 8	83.0	61.4
June 9	83.3	61.6
June 10	83.6	61.9
June 11	83.8	62.2
June 12	83.9	62.4
June 13	84.1	62.5
June 14	84.3	62.7
June 15	84.5	62.9
June 16	84.6	63.1
June 17	84.8	63.3
June 18	85.1	63.6
June 19	85.3	63.8
June 20	85.6	64.1
June 21	85.8	64.4
June 22	85.9	64.6
June 23	86.1	64.8
June 24	86.2	65.0
June 25	86.3	65.1
June 26	86.5	65.1
June 27	86.5	65.2
June 28	86.6	65.3
June 29	86.7	65.4
June 30	86.8	65.5
July 1	86.8	65.6
July 2	86.9	65.7
July 3	87.0	65.8
July 4	87.1	65.9
July 5	87.2	66.0
July 6	87.2	66.2
July 7	87.2	66.3
July 8	87.3	66.3
July 9	87.3	66.4
July 10	87.3	66.4
July 11	87.4	66.3
July 12	87.4	66.4
July 13	87.4	66.4
July 14	87.4	66.4
July 15	87.4	66.5
July 16	87.4	66.4
July 17	87.4	66.4
July 18	87.4	66.4
July 19	87.4	66.3
July 20	87.4	66.3
July 21	87.4	66.3
July 22	87.2	66.2
July 23	87.1	66.1
July 24	87.0	66.0
July 25	87.0	66.0
July 26	87.0	66.0
July 27	87.1	66.0
July 28	87.0	65.9
July 29	86.9	65.9
July 30	86.8	65.8
July 31	86.7	65.7
August 1	86.6	65.6
August 2	86.5	65.5
August 3	86.4	65.3
August 4	86.3	65.2
August 5	86.2	65.0
August 6	86.1	64.9
August 7	86.0	64.8
August 8	86.0	64.7
August 9	86.0	64.6
August 10	86.0	64.5
August 11	86.0	64.5
August 12	85.9	64.5
August 13	86.0	64.5
August 14	86.1	64.5
August 15	86.1	64.5
August 16	86.0	64.5
August 17	85.9	64.5
August 18	85.7	64.4
August 19	85.6	64.2
August 20	85.6	64.1
August 21	85.6	64.0
August 22	85.6	63.8
August 23	85.5	63.7
August 24	85.4	63.5
August 25	85.2	63.3
August 26	85.1	63.2
August 27	85.0	63.0
August 28	84.9	62.8
August 29	84.9	62.6
August 30	84.8	62.4
August 31	84.6	62.1
September 1	84.3	61.8
September 2	84.1	61.6
September 3	83.9	61.3
September 4	83.8	61.0
September 5	83.6	60.8
September 6	83.4	60.6
September 7	83.2	60.4
September 8	82.9	60.0
September 9	82.5	59.6
September 10	82.2	59.2
September 11	81.8	58.7
September 12	81.4	58.3
September 13	81.1	57.9
September 14	80.8	57.4
September 15	80.5	56.9
September 16	80.2	56.5
September 17	79.9	56.0
September 18	79.6	55.7
September 19	79.3	55.4
September 20	79.0	55.1
September 21	78.6	54.7
September 22	78.3	54.3
September 23	78.0	53.9
September 24	77.7	53.5
September 25	77.3	53.1
September 26	76.9	52.8
September 27	76.4	52.3
September 28	76.0	51.9
September 29	75.5	51.6
September 30	75.2	51.2
October 1	74.7	50.7
October 2	74.3	50.3
October 3	73.8	49.9
October 4	73.3	49.5
October 5	72.8	49.0
October 6	72.3	48.5
October 7	71.9	48.2
October 8	71.6	47.9
October 9	71.2	47.6
October 10	70.8	47.3
October 11	70.4	47.0
October 12	69.9	46.7
October 13	69.4	46.5
October 14	68.8	46.2
October 15	68.4	45.9
October 16	67.9	45.7
October 17	67.3	45.4
October 18	66.8	45.0
October 19	66.3	44.5
October 20	65.8	44.1
October 21	65.2	43.8
October 22	64.6	43.4
October 23	64.0	43.1
October 24	63.5	42.6
October 25	63.0	42.2
October 26	62.5	41.9
October 27	62.2	41.6
October 28	61.8	41.3
October 29	61.2	40.8
October 30	60.8	40.4
October 31	60.2	40.1
November 1	59.8	39.7
November 2	59.3	39.4
November 3	58.8	39.1
November 4	58.4	38.8
November 5	58.0	38.5
November 6	57.6	38.3
November 7	57.1	37.9
November 8	56.7	37.5
November 9	56.2	37.1
November 10	55.7	36.7
November 11	55.4	36.3
November 12	55.0	36.0
November 13	54.6	35.7
November 14	54.1	35.4
November 15	53.8	35.1
November 16	53.4	34.8
November 17	53.0	34.5
November 18	52.6	34.3
November 19	52.2	34.0
November 20	51.8	33.8
November 21	51.4	33.4
November 22	50.9	33.1
November 23	50.4	32.7
November 24	49.8	32.3
November 25	49.2	31.9
November 26	48.7	31.5
November 27	48.4	31.4
November 28	48.0	31.1
November 29	47.7	30.9
November 30	47.4	30.7
December 1	47.1	30.5
December 2	46.7	30.2
December 3	46.2	29.9
December 4	45.7	29.5
December 5	45.2	29.1
December 6	44.8	28.8
December 7	44.4	28.5
December 8	44.1	28.3
December 9	43.8	28.1
December 10	43.4	27.7
December 11	42.9	27.3
December 12	42.6	27.0
December 13	42.3	26.7
December 14	42.0	26.4
December 15	41.6	26.1
December 16	41.4	26.0
December 17	41.2	25.9
December 18	41.0	25.5
December 19	40.8	25.3
December 20	40.6	25.1
December 21	40.5	24.9
December 22	40.3	24.8
December 23	40.1	24.6
December 24	39.9	24.4
December 25	39.7	24.3
December 26	39.6	24.1
December 27	39.4	23.9
December 28	39.4	23.8
December 29	39.3	23.7
December 30	39.1	23.5
December 31	39.0	23.2

Weather Station Details

Years	Station	Coordinates
1896–2024	Charleston	location