Marion weather live forecast

Today's maximum temperature in Marion is expected to be 36°C. Select a day from the live weather forecast for Marion, Illinois, USA for more weather parameters.

Thursday
17th Sep
36

24

11

7
Friday
18th Sep
34

24

8

7
Saturday
19th Sep
35

24

9

7
Sunday
20th Sep
33

23

11

6
Monday
21st Sep
29

21

5

5

5-day weather forecast updated at 04:01 on Thursday 17th September 2026 GMT

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The 5-day weather forecast for Illinois (Marion) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Marion weather forecast by day

Below are the detailed weather forecasts for Marion for the next 5 days.

Marion weather for Thursday 17th September 2026

Expect scattered clouds in Marion, Illinois with a maximum temperature of 36°C, high levels of heat & humidity, maximum UV of 7 (High) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the west.

36
°C maximum temperature
24
°C minimum temperature
scattered clouds
11
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
H
high heat & humidity
11
kph wind from W

Marion weather for Friday 18th September 2026

Expect scattered clouds in Marion, Illinois with a maximum temperature of 34°C, high levels of heat & humidity, maximum UV of 7 (High) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 8 kph from the west.

34
°C maximum temperature
24
°C minimum temperature
scattered clouds
8
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
H
high heat & humidity
8
kph wind from W

Marion weather for Saturday 19th September 2026

Expect scattered clouds in Marion, Illinois with a maximum temperature of 35°C, high levels of heat & humidity, maximum UV of 7 (High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the south-west.

35
°C maximum temperature
24
°C minimum temperature
scattered clouds
9
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
H
high heat & humidity
13
kph wind from SW

Marion weather for Sunday 20th September 2026

Expect scattered clouds in Marion, Illinois with a maximum temperature of 33°C, high levels of heat & humidity, maximum UV of 6 (High) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the west.

33
°C maximum temperature
23
°C minimum temperature
scattered clouds
11
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
H
high heat & humidity
10
kph wind from W

Marion weather for Monday 21st September 2026

Expect isolated thunderstorms in Marion, Illinois with a maximum temperature of 29°C, moderate levels of heat & humidity, maximum UV of 5 (Moderate) and 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 59% chance of some rain and a light breeze of 10 kph from the north.