Annual mean 12°C · wettest around April · prevailing wind SW
Warmest
28.3 °C
Coldest
-0.8 °C
Wettest
37%
Windiest
6.0 m/s
Prevailing
SW
4.7 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Mattoon over the whole year is 12°C. July is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -3°C. Mattoon has no sharply defined rainy season: the chance of rain on a given day runs from 31% in August, the driest month, to 35% in April, the wettest. Winds in Mattoon are highest in March, averaging 4.6 m/s (17 km/h), and lightest in August, at 2.3 m/s (8 km/h). The prevailing wind is from the SW. The clearest skies in Mattoon come in June, when the sky is typically 27% covered; January is the cloudiest month, at 57%.
Month by month Mattoon climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
0°C
-3°C
-6°C
31%
57%
4.5 m/s
0
0
6
February
4°C
-1°C
-2°C
31%
47%
4.5 m/s
3
0
17
March
10°C
3°C
4°C
34%
48%
4.6 m/s
10
0
33
April
15°C
8°C
11°C
35%
43%
4.5 m/s
30
2
58
May
22°C
15°C
19°C
33%
42%
3.6 m/s
61
24
56
June
27°C
20°C
27°C
32%
27%
3.1 m/s
52
53
24
July
28°C
21°C
30°C
33%
28%
2.4 m/s
30
65
8
August
27°C
19°C
28°C
31%
29%
2.3 m/s
43
60
15
September
26°C
16°C
25°C
31%
27%
2.5 m/s
58
48
35
October
18°C
10°C
15°C
32%
38%
3.4 m/s
46
10
62
November
9°C
3°C
4°C
33%
40%
3.9 m/s
11
0
36
December
4°C
-0°C
-2°C
32%
50%
4.1 m/s
0
0
13
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Mattoon weather by season
Year round, Mattoon has days of about 0°C at their warmest in January, its coolest month, and 28°C in July, its warmest; the coolest hours of the day run from -3°C to 21°C through the year, and the average temperature over the year is 12°C around the clock. Rain is most likely around April and least likely around August. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Mattoon weather in winterDecember to February
High 3°CLow -2°CRain 32%
Winter in Mattoon has typical daily highs of about 3°C and lows of about -2°C, with a 32% chance of rain on a given day.
Mattoon weather in springMarch to May
High 15°CLow 9°CRain 34%
Spring in Mattoon has typical daily highs of about 15°C and lows of about 9°C, with a 34% chance of rain on a given day.
Mattoon weather in summerJune to August
High 27°CLow 20°CRain 32%
Summer in Mattoon has typical daily highs of about 27°C and lows of about 20°C, with a 32% chance of rain on a given day.
Mattoon weather in autumnSeptember to November
High 18°CLow 9°CRain 32%
Autumn in Mattoon has typical daily highs of about 18°C and lows of about 9°C, with a 32% chance of rain on a given day.
When is the rainy season in Mattoon?
Mattoon has no sharply defined rainy season: the chance of rain on a given day runs from 31% in August, the driest month, to 35% in April, the wettest.
What time of year is Mattoon windiest?
Winds in Mattoon are highest in March, averaging 4.6 m/s (17 km/h), and lightest in August, at 2.3 m/s (8 km/h). The prevailing wind is from the SW.
What is the average temperature in Mattoon year round?
The average temperature in Mattoon over the whole year is 12°C. July is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -3°C.