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.

Wednesday
2nd Sep
36

25

12

8
Thursday
3rd Sep
35

25

11

8
Friday
4th Sep
36

26

9

8
Saturday
5th Sep
34

25

6

7
Sunday
6th Sep
32

24

6

6

5-day weather forecast updated at 04:01 on Wednesday 2nd 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 Wednesday 2nd September 2026

Expect clear skies in Marion, Illinois with a maximum temperature of 36°C, high levels of heat & humidity, maximum UV of 8 (Very High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the south.

36
°C maximum temperature
25
°C minimum temperature
clear skies
12
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
H
high heat & humidity
13
kph wind from S

Marion weather for Thursday 3rd September 2026

Expect clear skies in Marion, Illinois with a maximum temperature of 35°C, high levels of heat & humidity, maximum UV of 8 (Very High) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the south.

35
°C maximum temperature
25
°C minimum temperature
clear skies
11
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
H
high heat & humidity
11
kph wind from S

Marion weather for Friday 4th September 2026

Expect scattered clouds in Marion, Illinois with a maximum temperature of 36°C, high levels of heat & humidity, maximum UV of 8 (Very High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and little or no wind of 6 kph from the south.

36
°C maximum temperature
26
°C minimum temperature
scattered clouds
9
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
H
high heat & humidity
6
kph wind from S

Marion weather for Saturday 5th September 2026

Expect isolated thunderstorms in Marion, Illinois with a maximum temperature of 34°C, high levels of heat & humidity, maximum UV of 7 (High) and 6 hours of bright sunshine. There are 2-5 mm of rainfall expected with 31% chance of some rain and little or no wind of 6 kph from the south.

34
°C maximum temperature
25
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
7
UV index (High)
31
% chance of some rain
<5
mm of rainfall expected
H
high heat & humidity
6
kph wind from S

Marion weather for Sunday 6th September 2026

Expect isolated thunderstorms in Marion, Illinois with a maximum temperature of 32°C, moderate levels of heat & humidity, maximum UV of 6 (High) and 6 hours of bright sunshine. There are 2-5 mm of rainfall expected with 41% chance of some rain and a light breeze of 8 kph from the north-east.