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 March 2026 Monday 11.1 ° C / 52°F  Light rain |
Feels Like : 8.1 ° C / 46.6°F Humidity : % 66 Pressure : 1015 mb Wind Speed : 28.4 kmph / 17.7 miles from NNW  Visibility : 16 km Precipitation (rainfall) : 0 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 March 2026 Sunday |  Patchy rain nearby |
9.3 ° C (48.7°F) |
32.2 ° C (90°F) |
22 ° C (71.6°F) |
% 58 | 82% | 1.5 | Sunrise:06:58 AM Sunset: 07:11 PM |
Moonrise:08:43 AM Moonset: 11:56 PM Moon Phase ( Waxing Crescent ) |
|
| 23 March 2026 Monday |  Partly Cloudy |
1.6 ° C (34.9°F) |
10.7 ° C (51.3°F) |
6.3 ° C (43.4°F) |
% 58 | 0% | 1.4 | Sunrise:06:56 AM Sunset: 07:12 PM |
Moonrise:09:27 AM Moonset: No moonset Moon Phase ( Waxing Crescent ) |
|
| 24 March 2026 Tuesday |  Overcast |
2.1 ° C (35.8°F) |
13.5 ° C (56.3°F) |
7.2 ° C (45°F) |
% 59 | 0% | 1.2 | Sunrise:06:54 AM Sunset: 07:13 PM |
Moonrise:10:19 AM Moonset: 01:10 AM Moon Phase ( Waxing Crescent ) |
|
| 25 March 2026 Wednesday |  Sunny |
3.7 ° C (38.7°F) |
21 ° C (69.8°F) |
11.9 ° C (53.4°F) |
% 69 | 0% | 1.5 | Sunrise:06:53 AM Sunset: 07:14 PM |
Moonrise:11:22 AM Moonset: 02:16 AM Moon Phase ( First Quarter ) |
|
| 26 March 2026 Thursday | Partly Cloudy |
12.4 ° C (54.2°F) |
27.5 ° C (81.4°F) |
19.9 ° C (67.7°F) |
% 75 | 0% | 1.7 | Sunrise:06:51 AM Sunset: 07:15 PM |
Moonrise:12:31 PM Moonset: 03:13 AM Moon Phase ( Waxing Gibbous ) |
|
| 27 March 2026 Friday |  Moderate rain |
3.6 ° C (38.4°F) |
9.3 ° C (48.8°F) |
9 ° C (48.2°F) |
% 80 | 80% | 0 | Sunrise:06:50 AM Sunset: 07:16 PM |
Moonrise:01:44 PM Moonset: 03:59 AM Moon Phase ( Waxing Gibbous ) |
|
| 28 March 2026 Saturday | Sunny |
0.4 ° C (32.8°F) |
12 ° C (53.5°F) |
5.8 ° C (42.4°F) |
% 53 | 0% | 3 | Sunrise:06:48 AM Sunset: 07:17 PM |
Moonrise:02:55 PM Moonset: 04:35 AM Moon Phase ( Waxing Gibbous ) |
|
| 29 March 2026 Sunday | Partly Cloudy |
2.4 ° C (36.3°F) |
14.1 ° C (57.4°F) |
8 ° C (46.5°F) |
% 54 | 0% | 3 | Sunrise:06:47 AM Sunset: 07:18 PM |
Moonrise:04:03 PM Moonset: 05:06 AM Moon Phase ( Waxing Gibbous ) |
|
| 30 March 2026 Monday | Partly Cloudy |
7.9 ° C (46.1°F) |
17.4 ° C (63.4°F) |
11.5 ° C (52.7°F) |
% 59 | 0% | 4 | Sunrise:06:45 AM Sunset: 07:19 PM |
Moonrise:05:09 PM Moonset: 05:32 AM Moon Phase ( Waxing Gibbous ) |
|
| 31 March 2026 Tuesday | Patchy rain nearby |
9.7 ° C (49.5°F) |
20 ° C (68°F) |
14.7 ° C (58.4°F) |
% 69 | 78% | 3 | Sunrise:06:44 AM Sunset: 07:20 PM |
Moonrise:06:13 PM Moonset: 05:55 AM Moon Phase ( Waxing Gibbous ) |
|
| 01 April 2026 Wednesday | Moderate rain |
11.8 ° C (53.3°F) |
19 ° C (66.1°F) |
15.7 ° C (60.2°F) |
% 77 | 85% | 4 | Sunrise:06:42 AM Sunset: 07:21 PM |
Moonrise:07:16 PM Moonset: 06:18 AM Moon Phase ( Waxing Gibbous ) |
|
| 02 April 2026 Thursday | Overcast |
7.6 ° C (45.6°F) |
12 ° C (53.6°F) |
9.9 ° C (49.9°F) |
% 65 | 0% | 2 | Sunrise:06:41 AM Sunset: 07:22 PM |
Moonrise:08:18 PM Moonset: 06:41 AM Moon Phase ( Full Moon ) |
|
| 03 April 2026 Friday | Patchy rain nearby |
5.5 ° C (41.8°F) |
12.4 ° C (54.3°F) |
8.8 ° C (47.8°F) |
% 78 | 87% | 2 | Sunrise:06:39 AM Sunset: 07:23 PM |
Moonrise:09:21 PM Moonset: 07:06 AM Moon Phase ( Waning Gibbous ) |
|
| 04 April 2026 Saturday | Patchy rain nearby |
13 ° C (55.3°F) |
15.8 ° C (60.5°F) |
14.5 ° C (58.1°F) |
% 89 | 84% | 3 | Sunrise:06:38 AM Sunset: 07:23 PM |
Moonrise:10:23 PM Moonset: 07:33 AM Moon Phase ( Waning Gibbous ) |
|
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