Illiopolis Weather Forecast 15 Days, Weather in Illiopolis Today
Current weather conditions and 15 day weather forecast for Illiopolis, Illinois, USA including weather daily high/low temperature, warnings, chance of precipitation, pressure, humidity/wind chill, rain risk, wind speed, cloud, pressure, and UV index.
Current weather conditions at Illiopolis
| 13 May 2026 Wednesday 18.3 ° C / 64.9°F  Overcast |
Feels Like : 18.3 ° C / 64.9°F Humidity : % 54 Pressure : 1013 mb Wind Speed : 19.1 kmph / 11.9 miles from NW  Visibility : 16 km Precipitation (rainfall) : 0 mm Cloud (%) : 100 |
15 day weather forecast for Illiopolis, IL, USA
Weather Forecast for next 15 Days for Illiopolis including weather warnings, temperature, rain, wind speed, cloud, snow, wind speed and wind direction, pressure and UV index.Here is weather for the next 15 days in Illiopolis, Illinois state, US. To see the daily forecast, scroll to the table below.
| Date | Weather forecast | Low temperature | High temperature | Avg. temperature | Humidity | Chance of rain | UV Index | Sun Position | Moon Position | |
|---|---|---|---|---|---|---|---|---|---|---|
| 13 May 2026 Wednesday |  Patchy rain nearby |
10.3 ° C (50.5°F) |
21 ° C (69.8°F) |
16.3 ° C (61.4°F) |
% 52 | 78% | 7.5 | Sunrise:05:43 AM Sunset: 08:03 PM |
Moonrise:03:33 AM Moonset: 04:36 PM Moon Phase ( Waning Crescent ) |
|
| 14 May 2026 Thursday |  Sunny |
7.7 ° C (45.8°F) |
19.6 ° C (67.3°F) |
13.6 ° C (56.4°F) |
% 60 | 0% | 8.1 | Sunrise:05:42 AM Sunset: 08:03 PM |
Moonrise:03:58 AM Moonset: 05:52 PM Moon Phase ( Waning Crescent ) |
|
| 15 May 2026 Friday |  Moderate rain |
12.1 ° C (53.8°F) |
27 ° C (80.6°F) |
18.8 ° C (65.9°F) |
% 69 | 87% | 0.3 | Sunrise:05:42 AM Sunset: 08:04 PM |
Moonrise:04:27 AM Moonset: 07:11 PM Moon Phase ( Waning Crescent ) |
|
| 16 May 2026 Saturday |  Heavy rain |
17.7 ° C (63.9°F) |
26.3 ° C (79.3°F) |
21.6 ° C (70.9°F) |
% 84 | 84% | 5 | Sunrise:05:41 AM Sunset: 08:05 PM |
Moonrise:05:04 AM Moonset: 08:31 PM Moon Phase ( New Moon ) |
|
| 17 May 2026 Sunday | Sunny |
18.1 ° C (64.6°F) |
28.2 ° C (82.8°F) |
22 ° C (71.5°F) |
% 76 | 0% | 6 | Sunrise:05:40 AM Sunset: 08:06 PM |
Moonrise:05:50 AM Moonset: 09:50 PM Moon Phase ( Waxing Crescent ) |
|
| 18 May 2026 Monday | Moderate rain |
20.1 ° C (68.1°F) |
26.4 ° C (79.6°F) |
22.4 ° C (72.3°F) |
% 82 | 88% | 5 | Sunrise:05:39 AM Sunset: 08:07 PM |
Moonrise:06:47 AM Moonset: 10:59 PM Moon Phase ( Waxing Crescent ) |
|
| 19 May 2026 Tuesday | Moderate rain |
18.6 ° C (65.5°F) |
21.7 ° C (71.1°F) |
20.5 ° C (68.9°F) |
% 92 | 88% | 5 | Sunrise:05:38 AM Sunset: 08:08 PM |
Moonrise:07:56 AM Moonset: 11:55 PM Moon Phase ( Waxing Crescent ) |
|
| 20 May 2026 Wednesday |  Partly Cloudy |
12.6 ° C (54.7°F) |
23.5 ° C (74.2°F) |
18.2 ° C (64.8°F) |
% 73 | 0% | 5 | Sunrise:05:37 AM Sunset: 08:09 PM |
Moonrise:09:12 AM Moonset: No moonset Moon Phase ( Waxing Crescent ) |
|
| 21 May 2026 Thursday | Sunny |
15.9 ° C (60.7°F) |
26.5 ° C (79.7°F) |
20.6 ° C (69.1°F) |
% 71 | 0% | 6 | Sunrise:05:37 AM Sunset: 08:10 PM |
Moonrise:10:28 AM Moonset: 12:39 AM Moon Phase ( Waxing Crescent ) |
|
| 22 May 2026 Friday | Patchy rain nearby |
13.8 ° C (56.8°F) |
24.6 ° C (76.2°F) |
19.1 ° C (66.3°F) |
% 81 | 72% | 4 | Sunrise:05:36 AM Sunset: 08:11 PM |
Moonrise:11:42 AM Moonset: 01:13 AM Moon Phase ( Waxing Crescent ) |
|
| 23 May 2026 Saturday | Partly Cloudy |
9.8 ° C (49.7°F) |
16.7 ° C (62°F) |
13.4 ° C (56.2°F) |
% 62 | 0% | 4 | Sunrise:05:35 AM Sunset: 08:11 PM |
Moonrise:12:51 PM Moonset: 01:41 AM Moon Phase ( First Quarter ) |
|
| 24 May 2026 Sunday | Sunny |
6.9 ° C (44.4°F) |
18.8 ° C (65.9°F) |
12.8 ° C (55°F) |
% 61 | 0% | 4 | Sunrise:05:34 AM Sunset: 08:12 PM |
Moonrise:01:57 PM Moonset: 02:05 AM Moon Phase ( Waxing Gibbous ) |
|
| 25 May 2026 Monday | Sunny |
10.3 ° C (50.6°F) |
22.4 ° C (72.3°F) |
16 ° C (60.8°F) |
% 68 | 0% | 5 | Sunrise:05:34 AM Sunset: 08:13 PM |
Moonrise:03:01 PM Moonset: 02:26 AM Moon Phase ( Waxing Gibbous ) |
|
| 26 May 2026 Tuesday | Partly Cloudy |
14 ° C (57.2°F) |
23.8 ° C (74.9°F) |
18.5 ° C (65.3°F) |
% 75 | 0% | 5 | Sunrise:05:33 AM Sunset: 08:14 PM |
Moonrise:04:03 PM Moonset: 02:48 AM Moon Phase ( Waxing Gibbous ) |
|
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