St. Peter Weather Forecast 15 Days, Weather in St. Peter Today
Current weather conditions and 15 day weather forecast for St. Peter, 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. Peter
| 21 June 2026 Sunday 20.6 ° C / 69.1°F  Partly cloudy |
Feels Like : 20.6 ° C / 69.1°F Humidity : % 75 Pressure : 1014 mb Wind Speed : 14 kmph / 8.7 miles from ESE  Visibility : 16 km Precipitation (rainfall) : 0 mm Cloud (%) : 50 |
15 day weather forecast for St. Peter, IL, USA
Weather Forecast for next 15 Days for St. Peter 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. Peter, 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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 21 June 2026 Sunday |  Heavy rain |
18.6 ° C (65.5°F) |
30.6 ° C (87.1°F) |
23.6 ° C (74.5°F) |
% 73 | 71% | 6.2 | Sunrise:05:30 AM Sunset: 08:24 PM |
Moonrise:12:44 PM Moonset: 12:25 AM Moon Phase ( First Quarter ) |
|
| 22 June 2026 Monday |  Patchy rain nearby |
16.9 ° C (62.4°F) |
21 ° C (69.9°F) |
19.2 ° C (66.6°F) |
% 89 | 57% | 5.8 | Sunrise:05:30 AM Sunset: 08:24 PM |
Moonrise:01:52 PM Moonset: 12:49 AM Moon Phase ( First Quarter ) |
|
| 23 June 2026 Tuesday | Partly Cloudy |
14.9 ° C (58.9°F) |
25.2 ° C (77.4°F) |
20.5 ° C (68.9°F) |
% 72 | 10% | 9.3 | Sunrise:05:30 AM Sunset: 08:24 PM |
Moonrise:02:58 PM Moonset: 01:14 AM Moon Phase ( Waxing Gibbous ) |
|
| 24 June 2026 Wednesday | Patchy rain nearby |
17.2 ° C (62.9°F) |
26.1 ° C (79°F) |
21.5 ° C (70.7°F) |
% 73 | 57% | 8.7 | Sunrise:05:31 AM Sunset: 08:24 PM |
Moonrise:04:05 PM Moonset: 01:40 AM Moon Phase ( Waxing Gibbous ) |
|
| 25 June 2026 Thursday | Patchy rain nearby |
18.4 ° C (65.2°F) |
26.4 ° C (79.5°F) |
21.5 ° C (70.6°F) |
% 84 | 77% | 0.4 | Sunrise:05:31 AM Sunset: 08:24 PM |
Moonrise:05:11 PM Moonset: 02:09 AM Moon Phase ( Waxing Gibbous ) |
|
| 26 June 2026 Friday | Patchy rain nearby |
18.3 ° C (64.9°F) |
27.3 ° C (81.1°F) |
22.4 ° C (72.3°F) |
% 81 | 51% | 5 | Sunrise:05:31 AM Sunset: 08:24 PM |
Moonrise:06:16 PM Moonset: 02:44 AM Moon Phase ( Waxing Gibbous ) |
|
| 27 June 2026 Saturday |  Moderate rain |
18.4 ° C (65.2°F) |
23.4 ° C (74.1°F) |
21.4 ° C (70.5°F) |
% 93 | 91% | 5 | Sunrise:05:32 AM Sunset: 08:24 PM |
Moonrise:07:16 PM Moonset: 03:24 AM Moon Phase ( Full Moon ) |
|
| 28 June 2026 Sunday |  Mist |
16 ° C (60.9°F) |
26.2 ° C (79.1°F) |
21 ° C (69.8°F) |
% 83 | 24% | 5 | Sunrise:05:32 AM Sunset: 08:24 PM |
Moonrise:08:09 PM Moonset: 04:12 AM Moon Phase ( Full Moon ) |
|
| 29 June 2026 Monday | Patchy rain nearby |
19 ° C (66.3°F) |
27.8 ° C (82.1°F) |
23.2 ° C (73.8°F) |
% 85 | 38% | 5 | Sunrise:05:33 AM Sunset: 08:24 PM |
Moonrise:08:55 PM Moonset: 05:06 AM Moon Phase ( Full Moon ) |
|
| 30 June 2026 Tuesday | Partly Cloudy |
21.2 ° C (70.1°F) |
31 ° C (87.7°F) |
25.6 ° C (78.1°F) |
% 83 | 16% | 7 | Sunrise:05:33 AM Sunset: 08:24 PM |
Moonrise:09:33 PM Moonset: 06:05 AM Moon Phase ( Full Moon ) |
|
| 01 July 2026 Wednesday |  Thundery outbreaks in nearby |
23.3 ° C (73.9°F) |
32.4 ° C (90.4°F) |
27.5 ° C (81.5°F) |
% 81 | 13% | 6 | Sunrise:05:33 AM Sunset: 08:24 PM |
Moonrise:10:05 PM Moonset: 07:06 AM Moon Phase ( Waning Gibbous ) |
|
| 02 July 2026 Thursday | Patchy rain nearby |
23.2 ° C (73.8°F) |
31.9 ° C (89.4°F) |
27.6 ° C (81.7°F) |
% 81 | 36% | 6 | Sunrise:05:34 AM Sunset: 08:24 PM |
Moonrise:10:32 PM Moonset: 08:07 AM Moon Phase ( Waning Gibbous ) |
|
| 03 July 2026 Friday | Patchy rain nearby |
23.8 ° C (74.9°F) |
33.5 ° C (92.4°F) |
28.3 ° C (82.9°F) |
% 77 | 41% | 6 | Sunrise:05:34 AM Sunset: 08:24 PM |
Moonrise:10:55 PM Moonset: 09:08 AM Moon Phase ( Waning Gibbous ) |
|
| 04 July 2026 Saturday | Patchy rain nearby |
22.9 ° C (73.2°F) |
31.9 ° C (89.4°F) |
27.1 ° C (80.7°F) |
% 82 | 64% | 6 | Sunrise:05:35 AM Sunset: 08:24 PM |
Moonrise:11:17 PM Moonset: 10:08 AM Moon Phase ( Waning Gibbous ) |
|
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