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United States weather

Weather in McLean County, Illinois for May 2026

Your guide to McLean County weather in May - trends and predictions

    Temperatures

  • In general, the average temperature in McLean County at the beginning of May is 17.3 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 19.3 °F by the end of May.

    • Rain 🌧️

  • The climate of McLean County in May is notably wet, with an average of 13 rainy days, and a total of 54.8 mm of precipitation.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
18
Dry days
Average rainy days
13
Rainy days
Average snowy days
0
Snow days
Average temperatures
21°/11°
Temperatures
Average wind speed
22 km/h
Avg max wind
Average humidity
73 %
Avg humidity

McLean County Weather May

Move between months or click on a day
April
June
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Heavy rain at times
19°
2
Patchy rain possible
18°
3
Patchy rain possible
16°
4
Moderate rain at times
11°
5
Patchy rain possible
15°
6
Overcast
19°
7
Overcast
23°
8
Overcast
19°
9
Sunny
21°
10
Sunny
26°
11
Sunny
26°
12
Patchy rain possible
24°
13
Patchy rain possible
25°
14
Overcast
27°
15
Moderate or heavy rain shower
30°
16
Moderate or heavy rain shower
29°
17
Overcast
21°
18
Overcast
22°
19
Overcast
21°
20
Moderate or heavy rain shower
22°
21
Patchy rain possible
15°
22
Moderate rain at times
15°
23
Overcast
20°
24
Overcast
19°
25
Overcast
13°
26
Overcast
16°
27
Overcast
17°
28
Mist
20°
29
Mist
20°
30
Light rain shower
23°
31
Thundery outbreaks possible
26°

Temperatures trend during May in McLean County

See the weather trend as well as the moving average line

May weather in McLean County day by day

Click on a date for more information
April June
Date Weather Temperatures Rain UV More
May 1 Heavy rain at times
Heavy rain at times
 19° /15° 10.2 mm 3
May 2 Patchy rain possible
Patchy rain possible
 18° /11° 0.6 mm 2
May 3 Patchy rain possible
Patchy rain possible
 16° /9° 2.4 mm 5
May 4 Moderate rain at times
Moderate rain at times
 11° /7° 1.2 mm 1
May 5 Patchy rain possible
Patchy rain possible
 15° /7° 0.9 mm 4
May 6 Overcast
Overcast
 19° /9° 0 mm 3
May 7 Overcast
Overcast
 23° /11° 0 mm 3
May 8 Overcast
Overcast
 19° /7° 0 mm 2
May 9 Sunny
Sunny
 21° /5° 0 mm 10
May 10 Sunny
Sunny
 26° /9° 0 mm 10
May 11 Sunny
Sunny
 26° /8° 0 mm 10
May 12 Patchy rain possible
Patchy rain possible
 24° /13° 0.7 mm 7
May 13 Patchy rain possible
Patchy rain possible
 25° /16° 1.8 mm 3
May 14 Overcast
Overcast
 27° /16° 0 mm 6
May 15 Moderate or heavy rain shower
Moderate or heavy rain shower
 30° /19° 2.4 mm 8
May 16 Moderate or heavy rain shower
Moderate or heavy rain shower
 29° /16° 5.2 mm 10
May 17 Overcast
Overcast
 21° /11° 0 mm 10
May 18 Overcast
Overcast
 22° /9° 0 mm 10
May 19 Overcast
Overcast
 21° /9° 0 mm 2
May 20 Moderate or heavy rain shower
Moderate or heavy rain shower
 22° /14° 16.7 mm 2
May 21 Patchy rain possible
Patchy rain possible
 15° /10° 2.4 mm 4
May 22 Moderate rain at times
Moderate rain at times
 15° /8° 1.6 mm 3
May 23 Overcast
Overcast
 20° /9° 0 mm 8
May 24 Overcast
Overcast
 19° /10° 0 mm 6
May 25 Overcast
Overcast
 13° /9° 0 mm 5
May 26 Overcast
Overcast
 16° /6° 0 mm 2
May 27 Overcast
Overcast
 17° /12° 0 mm 2
May 28 Mist
Mist
 20° /14° 0 mm 2
May 29 Mist
Mist
 20° /11° 0 mm 4
May 30 Light rain shower
Light rain shower
 23° /13° 8.7 mm 10
May 31 Thundery outbreaks possible
Thundery outbreaks possible
 26° /15° 0 mm 11
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Important Notice
Our weather forecast for McLean County in May is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the McLean County forecast closer to your planned date for the most up-to-date weather information.
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McLean County in May - FAQ

What are the expected maximum and minimum temperatures in McLean County during May?

Enjoy moderate daytime temperatures of up to 21° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in McLean County during May?

Moderate rainfall is anticipated in McLean County during May, with a total of 54.8 mm spread over approximately 13 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in McLean County during May?

The average wind speed in McLean County during May is 22 km/h, suggesting breezy to windy conditions, depending on your activities.

May rainfall patterns in McLean County

Explore the daily rainfall trends and prepare for McLean Countys May weather 💧
Typically, McLean County has 13 rainy days in May with a total of 54.8 mm of rainfall.

UV exposure in McLean County during May

Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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Bloomington
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Location coordinates Where is McLean County?

Get accurate weather forecasts for McLean County, located at latitude 40.484 and longitude -88.994. Stay updated with localized weather information tailored for McLean County.

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