Effingham (IL)
May
Weather in Effingham, Illinois for May 2026
Your guide to Effingham weather in May - trends and predictions
In general, the average temperature in Effingham at the beginning of May is 17.1 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 18.9 °F by the end of May.
Effingham in May brings notable rainfall, with an average of 16 rainy days and a total precipitation of 159.8 mm.
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Temperatures
Rain 🌧️
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15
Dry days
16
Rainy days
0
Snow days
21°/12°
Temperatures
20 km/h
Avg max wind
81 %
Avg humidity
Effingham Weather May
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Temperatures trend during May in Effingham
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May weather in Effingham day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Moderate or heavy rain shower | 22° /16° | 10.6 mm | 5 | |
| May 2 | Moderate rain at times | 19° /14° | 1.7 mm | 4 | |
| May 3 | Moderate or heavy rain shower | 15° /10° | 24.9 mm | 4 | |
| May 4 |  Heavy rain at times | 9° /8° | 6.7 mm | 2 | |
| May 5 |  Patchy rain possible | 15° /8° | 0.6 mm | 4 | |
| May 6 |  Overcast | 19° /8° | 0 mm | 4 | |
| May 7 | Patchy rain possible | 21° /11° | 0.4 mm | 5 | |
| May 8 | Patchy rain possible | 20° /10° | 0.7 mm | 5 | |
| May 9 |  Cloudy | 21° /8° | 0 mm | 5 | |
| May 10 |  Sunny | 24° /7° | 0 mm | 6 | |
| May 11 | Cloudy | 25° /11° | 0 mm | 6 | |
| May 12 | Moderate or heavy rain shower | 21° /15° | 14.3 mm | 5 | |
| May 13 | Patchy rain possible | 24° /16° | 3.3 mm | 5 | |
| May 14 | Overcast | 27° /15° | 0.1 mm | 6 | |
| May 15 | Patchy rain possible | 28° /20° | 0.6 mm | 6 | |
| May 16 | Moderate or heavy rain shower | 28° /18° | 4.3 mm | 6 | |
| May 17 |  Partly cloudy | 20° /15° | 0 mm | 6 | |
| May 18 | Overcast | 21° /12° | 0 mm | 5 | |
| May 19 | Overcast | 25° /13° | 0 mm | 6 | |
| May 20 | Moderate or heavy rain shower | 25° /16° | 33.8 mm | 6 | |
| May 21 | Sunny | 20° /12° | 0 mm | 5 | |
| May 22 | Patchy rain possible | 15° /10° | 0.2 mm | 4 | |
| May 23 | Cloudy | 19° /7° | 0 mm | 4 | |
| May 24 | Overcast | 19° /11° | 0 mm | 4 | |
| May 25 | Overcast | 15° /12° | 0 mm | 4 | |
| May 26 | Moderate rain at times | 14° /8° | 11 mm | 3 | |
| May 27 |  Heavy rain | 16° /13° | 37 mm | 4 | |
| May 28 | Light rain shower | 19° /14° | 5.8 mm | 4 | |
| May 29 |  Fog | 18° /11° | 0 mm | 4 | |
| May 30 | Fog | 22° /13° | 0 mm | 5 | |
| May 31 | Overcast | 28° /15° | 3.9 mm | 6 | |
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Important Notice
Our weather forecast for Effingham 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 Effingham forecast closer to your planned date for the most up-to-date weather information.
Change Month
Effingham in May - FAQ
What are the expected maximum and minimum temperatures in Effingham during May?
Enjoy moderate daytime temperatures of up to 21° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Effingham during May?
Significant rainfall exceeding 159.8 mm is expected in Effingham during May, occurring over more than 16 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Effingham during May?
The average wind speed in Effingham during May is 20 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Effingham
Explore the daily rainfall trends and prepare for Effinghams May weather 💧
UV exposure in Effingham during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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