Decatur, IL weather and climate in 2024
Day
4 °C
Night
-5 °C
Sea
0 °C
Precipitation
71 mm
in month
Rainy days
9 days
in month
Daylight
9 hours
average
Sunshine
4 hours
average
Humidity
78 %
Day
4 °C
Night
-5 °C
Sea
0 °C
Precipitation
71 mm
in month
Rainy days
9 days
in month
Daylight
9 hours
average
Sunshine
4 hours
average
Humidity
78 %
Overview: Decatur, IL
Weather charts for Decatur, IL
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Weather overview for Decatur, IL
Weather overview
Decatur, IL (United States of America) is a place with a mild continental climate. The day temperatures range from 2 °C (35 °F) in January to 31 °C (87 °F) in July. The driest month is February with just 8 days of rain, on the contrary, the month when it rains the most is May with 13 days of rain. Temperatures during the night go from -8 °C (18 °F) in January to 18 °C (65 °F) in July.
January weather
The minimum of the day temperature is observable, with its value being 2 °C (35 °F) in Decatur, IL, and the minimum of the night temperature is observable too, with its value being -8 °C (18 °F). The number of rainy days starts to descent, the value of this measure is 8 days, while the rainfall amount continues to descent, its value is 54 mm (2.13 in). The number of sun hours (without clouds) starts to rise, with its value being 5 hours.
February weather
The day temperature starts to rise, the value of this measure is 4 °C (40 °F) in Decatur, IL, and the night temperature rise's start could be observed as well, with its value of -6 °C (21 °F). The minimum of the number of rainy days is observable, with its value of 8 days, and the rainfall amount is on its minimum as well, with its value being 52 mm (2.03 in). The number of sun hours (without clouds) rises similarly to the previous month.
March weather
The number of rainy days rise's start could be observed, its value is 11 days in Decatur, IL, and the rainfall amount rise's start could be observed as well, the value of this measure is 72 mm (2.84 in). The day temperature rises similarly to the previous month, its value is 11 °C (52 °F), and the rise of the night temperature can be observed too, with its value of 0 °C (31 °F). The number of sun hours (without clouds) continues to rise, with its value being 6 hours.
April weather
The rise of the day temperature can be observed, with its value of 18 °C (65 °F) in Decatur, IL, and the night temperature rises similarly to the previous month too, the value of this measure is 5 °C (41 °F). The rise of the number of rainy days can be observed, with its value of 12 days, and the rainfall amount continues to rise too. The humidity reaches its minimum, with its value being 65 %. The maximum of the wind speed can be noticed in this month.
May weather
The tourist season is about to start in May in Decatur, IL. The day temperature continues to rise, with its value being 24 °C (75 °F), and the night temperature continues to rise as well, with its value of 11 °C (51 °F). The number of rainy days reaches its maximum, with its value being 13 days, and the rainfall amount reaches its maximum too in this month. The rise of the number of sun hours (without clouds) can be observed, its value is 9 hours.
June weather
There is pending tourist season in Decatur, IL. The number of rainy days starts to descent, with its value of 12 days, and the rainfall amount descent's start could be observed too, its value is 105 mm (4.14 in). The rise of the day temperature can be observed, with its value being 29 °C (84 °F). The maximum of the day length is observable in this month. The number of sun hours (without clouds) reaches its maximum in June.
July weather
The day temperature reaches its maximum, the value of this measure is 31 °C (87 °F) in Decatur, IL, and the night temperature is on its maximum too in July. The number of rainy days continues to descent, with its value of 11 days. The tourist season is taking place.
August weather
There is pending tourist season this month in Decatur, IL. The day temperature starts to descent, the value of this measure is 30 °C (86 °F), and the night temperature starts to descent too. The number of rainy days continues to descent, the value of this measure is 10 days, while the beginning of the descent of the rainfall amount could be noticed, its value is 88 mm (3.47 in). The minimum of the wind speed is observable, with its value being 3.
September weather
The tourist season continues in Decatur, IL. The day temperature descents similarly to the previous month, with its value being 27 °C (80 °F), and the night temperature descents similarly to the previous month too. The descent of the rainfall amount can be observed, with its value being 78 mm (3.08 in), and the number of rainy days continues to descent too, with its value of 8 days. The number of sun hours (without clouds) descents similarly to the previous month, with its value of 8 hours.
October weather
The descent of the day temperature can be observed, the value of this measure is 20 °C (67 °F) in Decatur, IL, and the descent of the night temperature can be observed as well. The tourist season is taking place. The number of rainy days rise's start could be observed, with its value being 9 days. The number of sun hours (without clouds) descents similarly to the previous month.
November weather
The day temperature descents similarly to the previous month, with its value of 11 °C (53 °F) in Decatur, IL, and the descent of the night temperature can be observed as well, with its value being 1 °C (34 °F). The rise of the number of rainy days can be observed, the value of this measure is 10 days, while the beginning of the rise of the rainfall amount could be noticed, its value is 89 mm (3.52 in). The number of sun hours (without clouds) descents similarly to the previous month, with its value being 4 hours.
December weather
The day temperature descents similarly to the previous month, with its value of 4 °C (39 °F) in Decatur, IL, and the night temperature continues to descent as well, with its value being -5 °C (23 °F). The rainfall amount descent's start could be observed, the value of this measure is 71 mm (2.78 in). The number of sun hours (without clouds) is on its minimum in December. The minimum of the day length is observable, its value is 9 hours. The maximum of the humidity can be noticed, its value is 78 %.
FAQs
How many hours of sun to expect in April in Decatur, IL?
There is an average length of sunshine of 7 hours per day in Decatur, IL in April. That's 1 hour more than in the previous month. This means that the value difference is 23 %.
Is there a dry season in May in Decatur, IL?
No, May is not a dry month in Decatur, IL, expect rain approximately 13 days in a month.
What temperature can I expect during the day in Decatur, IL in June?
In June in Decatur, IL, the average daily temperatures will be 29 °C (84 °F). The ideal temperature for enjoying sunbathing by the water and a good temperature for other activities. For some people, it will be too hot in the direct sunlight and the stay may not be so pleasant. This value is 5 °C (41 °F) higher than last month. Don't forget to pack flip-flops, sunscreen, and a hand fan if necessary - it may come in handy.
Is it hot in July in Decatur, IL?
In Decatur, IL in July, you will enjoy nice warm weather, but it will also be pleasant and you probably won't feel hot.
Is August part of the wet season in Decatur, IL?
No, there is no wet season in August in Decatur, IL - you can expect 10 days of rain during the month.
How many days of precipitation on average can I expect in Decatur, IL in September?
In Decatur, IL in September, we can expect 8 days to be rainy, that is, days when precipitation exceeds 2 mm (0.08 in). Converted to days of the week, this means that it will occur on an average of 1.9 days of the week, or in general - 28 % days. In absolute terms, the decrease compared to the last month is 1 day. This means 13 % value difference.
Is October a good month to visit Decatur, IL?
There are good conditions for visiting in Decatur, IL in October. There are only 9 days of rain in the whole month, so you can leave your umbrella at home. There are some people, who may feel a slight chill at 20 °C (67 °F), but others will feel perfectly fine. The temperature of 6 °C (43 °F) at night may make it better to dine inside or to put on more clothes for a dinner outside.
We make the most from 40 years of historical weather data to predict the best weather conditions.
Deciding on where to go for a holiday is hard sometimes. Get inspired by the most popular destinations.
We aggregate data from combining multiple weather sources to ensure accuracy of the highest order.