May Weather Forecast 15 Days, Weather in May Today
Current weather conditions and 15 day weather forecast for May, 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 May
| 26 September 2026 Saturday 15.1 ° C / 59.1°F  Overcast |
Feels Like : 12.8 ° C / 55°F Humidity : % 66 Pressure : 1021 mb Wind Speed : 10.4 kmph / 6.5 miles from E  Visibility : 10 km Precipitation (rainfall) : 0 mm Cloud (%) : 100 |
15 day weather forecast for May, IL, USA
Weather Forecast for next 15 Days for May 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 May, 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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 26 September 2026 Saturday | Overcast |
14.6 ° C (58.3°F) |
19.8 ° C (67.7°F) |
16.8 ° C (62.3°F) |
% 57 | 12% | 5.1 | Sunrise:06:48 AM Sunset: 06:48 PM |
Moonrise:06:38 PM Moonset: 06:48 AM Moon Phase ( Full Moon ) |
|
| 27 September 2026 Sunday |  Sunny |
15.2 ° C (59.3°F) |
24.1 ° C (75.3°F) |
18 ° C (64.4°F) |
% 52 | 17% | 5.8 | Sunrise:06:49 AM Sunset: 06:46 PM |
Moonrise:07:01 PM Moonset: 07:51 AM Moon Phase ( Waning Gibbous ) |
|
| 28 September 2026 Monday | Sunny |
11.4 ° C (52.5°F) |
25 ° C (77°F) |
18.1 ° C (64.5°F) |
% 53 | 3% | 5.9 | Sunrise:06:50 AM Sunset: 06:44 PM |
Moonrise:07:27 PM Moonset: 08:56 AM Moon Phase ( Waning Gibbous ) |
|
| 29 September 2026 Tuesday | Overcast |
14 ° C (57.2°F) |
27.1 ° C (80.8°F) |
20.5 ° C (69°F) |
% 50 | 7% | 6 | Sunrise:06:51 AM Sunset: 06:43 PM |
Moonrise:07:57 PM Moonset: 10:03 AM Moon Phase ( Waning Gibbous ) |
|
| 30 September 2026 Wednesday | Overcast |
18.5 ° C (65.4°F) |
27.5 ° C (81.6°F) |
23 ° C (73.5°F) |
% 50 | 57% | 6 | Sunrise:06:52 AM Sunset: 06:41 PM |
Moonrise:08:36 PM Moonset: 11:13 AM Moon Phase ( Waning Gibbous ) |
|
| 01 October 2026 Thursday | Overcast |
22.6 ° C (72.7°F) |
29 ° C (84.2°F) |
25 ° C (77.1°F) |
% 59 | 66% | 6 | Sunrise:06:53 AM Sunset: 06:39 PM |
Moonrise:09:23 PM Moonset: 12:21 PM Moon Phase ( Last Quarter ) |
|
| 02 October 2026 Friday |  Patchy rain nearby |
20.3 ° C (68.5°F) |
28.5 ° C (83.3°F) |
23.7 ° C (74.6°F) |
% 75 | 57% | 7 | Sunrise:06:54 AM Sunset: 06:38 PM |
Moonrise:10:21 PM Moonset: 01:26 PM Moon Phase ( Last Quarter ) |
|
| 03 October 2026 Saturday | Overcast |
18.7 ° C (65.7°F) |
28.3 ° C (82.9°F) |
23.2 ° C (73.7°F) |
% 76 | 56% | 6 | Sunrise:06:55 AM Sunset: 06:36 PM |
Moonrise:11:29 PM Moonset: 02:23 PM Moon Phase ( Last Quarter ) |
|
| 04 October 2026 Sunday | Sunny |
10.4 ° C (50.7°F) |
22.1 ° C (71.8°F) |
15.3 ° C (59.5°F) |
% 68 | 57% | 5 | Sunrise:06:56 AM Sunset: 06:35 PM |
Moonrise:Does not rise today Moonset: 03:11 PM Moon Phase ( Last Quarter ) |
|
| 05 October 2026 Monday | Overcast |
6.9 ° C (44.4°F) |
14.9 ° C (58.9°F) |
10.9 ° C (51.6°F) |
% 55 | 8% | 4 | Sunrise:06:56 AM Sunset: 06:33 PM |
Moonrise:12:44 AM Moonset: 03:50 PM Moon Phase ( Waning Crescent ) |
|
| 06 October 2026 Tuesday | Sunny |
4.2 ° C (39.6°F) |
12.7 ° C (54.9°F) |
8.1 ° C (46.5°F) |
% 49 | 3% | 4 | Sunrise:06:57 AM Sunset: 06:31 PM |
Moonrise:02:00 AM Moonset: 04:22 PM Moon Phase ( Waning Crescent ) |
|
| 07 October 2026 Wednesday | Sunny |
2.1 ° C (35.8°F) |
10.5 ° C (50.9°F) |
6.1 ° C (43°F) |
% 49 | 2% | 4 | Sunrise:06:58 AM Sunset: 06:30 PM |
Moonrise:03:16 AM Moonset: 04:51 PM Moon Phase ( Waning Crescent ) |
|
| 08 October 2026 Thursday | Sunny |
1.6 ° C (34.9°F) |
12.4 ° C (54.3°F) |
7 ° C (44.5°F) |
% 45 | 2% | 4 | Sunrise:06:59 AM Sunset: 06:28 PM |
Moonrise:04:31 AM Moonset: 05:17 PM Moon Phase ( Waning Crescent ) |
|
| 09 October 2026 Friday | Sunny |
4.8 ° C (40.6°F) |
17.7 ° C (63.8°F) |
11 ° C (51.8°F) |
% 38 | 3% | 4 | Sunrise:07:00 AM Sunset: 06:27 PM |
Moonrise:05:45 AM Moonset: 05:42 PM Moon Phase ( New Moon ) |
|
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