St. Johns Weather Forecast 15 Days, Weather in St. Johns Today
Current weather conditions and 15 day weather forecast for St. Johns, 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 St. Johns
| 23 December 2025 Tuesday 10.6 ° C / 51.1°F  Overcast |
Feels Like : 8.6 ° C / 47.6°F Humidity : % 83 Pressure : 1019 mb Wind Speed : 15.1 kmph / 9.4 miles from S  Visibility : 16 km Precipitation (rainfall) : 0.01 mm Cloud (%) : 100 |
15 day weather forecast for St. Johns, IL, USA
Weather Forecast for next 15 Days for St. Johns 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 St. Johns, 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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 22 December 2025 Monday |  Partly Cloudy |
-0.7 ° C (30.7°F) |
11.4 ° C (52.5°F) |
4.8 ° C (40.6°F) |
% 62 | 0% | 0.4 | Sunrise:07:10 AM Sunset: 04:42 PM |
Moonrise:09:23 AM Moonset: 07:07 PM Moon Phase ( Waxing Crescent ) |
|
| 23 December 2025 Tuesday | Overcast |
7.7 ° C (45.9°F) |
13.4 ° C (56.1°F) |
11 ° C (51.7°F) |
% 95 | 0% | 0.4 | Sunrise:07:11 AM Sunset: 04:42 PM |
Moonrise:09:55 AM Moonset: 08:12 PM Moon Phase ( Waxing Crescent ) |
|
| 24 December 2025 Wednesday |  Mist |
9.8 ° C (49.6°F) |
16 ° C (60.8°F) |
12.5 ° C (54.5°F) |
% 97 | 0% | 0.2 | Sunrise:07:11 AM Sunset: 04:43 PM |
Moonrise:10:23 AM Moonset: 09:17 PM Moon Phase ( Waxing Crescent ) |
|
| 25 December 2025 Thursday |  Fog |
11.1 ° C (52°F) |
14.8 ° C (58.6°F) |
14.6 ° C (58.3°F) |
% 96 | 0% | 0.3 | Sunrise:07:12 AM Sunset: 04:43 PM |
Moonrise:10:48 AM Moonset: 10:22 PM Moon Phase ( Waxing Crescent ) |
|
| 26 December 2025 Friday | Partly Cloudy |
14 ° C (57.2°F) |
21.7 ° C (71.1°F) |
17.6 ° C (63.7°F) |
% 80 | 0% | 0.5 | Sunrise:07:12 AM Sunset: 04:44 PM |
Moonrise:11:12 AM Moonset: 11:28 PM Moon Phase ( Waxing Crescent ) |
|
| 27 December 2025 Saturday |  Sunny |
13.5 ° C (56.3°F) |
22.7 ° C (72.9°F) |
15.7 ° C (60.3°F) |
% 82 | 0% | 0 | Sunrise:07:12 AM Sunset: 04:45 PM |
Moonrise:11:36 AM Moonset: No moonset Moon Phase ( First Quarter ) |
|
| 28 December 2025 Sunday | Partly Cloudy |
1.3 ° C (34.4°F) |
6.6 ° C (43.8°F) |
5.8 ° C (42.4°F) |
% 50 | 0% | 3 | Sunrise:07:13 AM Sunset: 04:45 PM |
Moonrise:12:02 PM Moonset: 12:35 AM Moon Phase ( Waxing Gibbous ) |
|
| 29 December 2025 Monday | Sunny |
-3.3 ° C (26°F) |
2.1 ° C (35.9°F) |
-0.7 ° C (30.7°F) |
% 35 | 0% | 2 | Sunrise:07:13 AM Sunset: 04:46 PM |
Moonrise:12:31 PM Moonset: 01:46 AM Moon Phase ( Waxing Gibbous ) |
|
| 30 December 2025 Tuesday |  Light freezing rain |
-6.2 ° C (20.8°F) |
1.8 ° C (35.3°F) |
-2.5 ° C (27.5°F) |
% 38 | 61% | 1 | Sunrise:07:13 AM Sunset: 04:47 PM |
Moonrise:01:07 PM Moonset: 03:01 AM Moon Phase ( Waxing Gibbous ) |
|
| 31 December 2025 Wednesday | Partly Cloudy |
0.6 ° C (33.2°F) |
11.4 ° C (52.5°F) |
5.3 ° C (41.6°F) |
% 76 | 0% | 3 | Sunrise:07:13 AM Sunset: 04:48 PM |
Moonrise:01:51 PM Moonset: 04:19 AM Moon Phase ( Waxing Gibbous ) |
|
| 01 January 2026 Thursday | Sunny |
4.8 ° C (40.6°F) |
16.6 ° C (61.8°F) |
9.7 ° C (49.4°F) |
% 67 | 0% | 3 | Sunrise:07:14 AM Sunset: 04:48 PM |
Moonrise:02:47 PM Moonset: 05:36 AM Moon Phase ( Waxing Gibbous ) |
|
| 02 January 2026 Friday |  Cloudy |
10.1 ° C (50.3°F) |
18.6 ° C (65.5°F) |
14 ° C (57.3°F) |
% 82 | 0% | 3 | Sunrise:07:14 AM Sunset: 04:49 PM |
Moonrise:03:55 PM Moonset: 06:46 AM Moon Phase ( Waxing Gibbous ) |
|
| 03 January 2026 Saturday | Partly Cloudy |
-1.1 ° C (30°F) |
4 ° C (39.2°F) |
3.5 ° C (38.4°F) |
% 56 | 0% | 2 | Sunrise:07:14 AM Sunset: 04:50 PM |
Moonrise:05:10 PM Moonset: 07:45 AM Moon Phase ( Full Moon ) |
|
| 04 January 2026 Sunday | Sunny |
-4.3 ° C (24.2°F) |
3.7 ° C (38.6°F) |
-1.3 ° C (29.7°F) |
% 45 | 0% | 2 | Sunrise:07:14 AM Sunset: 04:51 PM |
Moonrise:06:26 PM Moonset: 08:32 AM Moon Phase ( Waning Gibbous ) |
|
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