Marion weather live forecast

Today's maximum temperature in Marion is expected to be 28°C. Select a day from the live weather forecast for Marion, Illinois, USA for more weather parameters.

Monday
18th May
28

22

5

8
Tuesday
19th May
27

19

4

8
Wednesday
20th May
20

14

1

4
Thursday
21st May
22

13

3

6
Friday
22nd May
22

16

0

1

5-day weather forecast updated at 04:01 on Monday 18th May 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 Monday 18th May 2026

Expect broken clouds in Marion, Illinois with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 8 (Very High) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 25 kph from the south.

28
°C maximum temperature
22
°C minimum temperature
broken clouds
5
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
25
kph wind from S

Marion weather for Tuesday 19th May 2026

Expect isolated thunderstorms in Marion, Illinois with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 8 (Very High) and 4 hours of bright sunshine. There are 10-20 mm of rainfall expected with 75% chance of some rain and a moderate breeze of 24 kph from the south.

27
°C maximum temperature
19
°C minimum temperature
isolated thunderstorms
4
hours of sunshine
8
UV index (Very High)
75
% chance of some rain
<20
mm of rainfall expected
L
low heat & humidity
24
kph wind from S

Marion weather for Wednesday 20th May 2026

Expect isolated thunderstorms in Marion, Illinois with a maximum temperature of 20°C, maximum UV of 4 (Moderate) and 1 hour of bright sunshine. There are 5-10 mm of rainfall expected with 50% chance of some rain and a gentle breeze of 16 kph from the north.

20
°C maximum temperature
14
°C minimum temperature
isolated thunderstorms
1
hour of sunshine
4
UV index (Moderate)
50
% chance of some rain
<10
mm of rainfall expected
20
°C wind chill
16
kph wind from N

Marion weather for Thursday 21st May 2026

Expect mostly cloudy with light rain in Marion, Illinois with a maximum temperature of 22°C, maximum UV of 6 (High) and 3 hours of bright sunshine. There are 2-5 mm of rainfall expected with 40% chance of some rain and a gentle breeze of 14 kph from the north-east.

22
°C maximum temperature
13
°C minimum temperature
mostly cloudy with light rain
3
hours of sunshine
6
UV index (High)
40
% chance of some rain
<5
mm of rainfall expected
22
°C wind chill
14
kph wind from NE

Marion weather for Friday 22nd May 2026

Expect isolated thunderstorms in Marion, Illinois with a maximum temperature of 22°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 59% chance of some rain and a light breeze of 11 kph from the east.