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St. Peter, IL Weather Forecast
St. Peter, IL Weather Forecast Dated: 1107 PM Sat Sep 19 2026
Expect a mild stretch with more clouds than sun and occasional showers over the coming period. moderate humidity and no major pressure swings will dominate.
Saturday, September 19, 2026
Mid-Morning
80°F 27°C
Sunny
Mid-Afternoon
96°F 36°C
Overcast
Early-Evening
89°F 31°C
Overcast
Very hot with temperatures reaching 96°F 36°C, sunny in the morning, becoming overcast through the afternoon and evening, with lower humidity and barometric pressure falling. Winds turning from the SW to the S at 4 mph 7 km/h.
Sunday, September 20, 2026
Mid-Morning
80°F 27°C
Overcast
Mid-Afternoon
95°F 35°C
Overcast
Early-Evening
81°F 27°C
Cloudy
Hot and sweltering around 95°F 35°C, overcast throughout the day, with increasing humidity and steady pressure. Winds switching from the WSW to the NE at 13 mph 21 km/h. Gusts up to 22 mph 36 km/h.
Monday, September 21, 2026
Mid-Morning
65°F 18°C
Light Showers
Mid-Afternoon
69°F 20°C
Scattered Showers
Early-Evening
69°F 20°C
Overcast
Enjoyable around 69°F 20°C, locally heavy downpours at times, with lower humidity and steady pressure. Winds NNE at 7 mph 12 km/h.
Tuesday, September 22, 2026
Mid-Morning
62°F 17°C
Overcast
Mid-Afternoon
69°F 21°C
Overcast
Early-Evening
64°F 18°C
Overcast
Mild temperatures up to 69°F 21°C, overcast through the afternoon, turning cloudy this evening, with steady humidity and steady pressure. Winds swinging from the NE to the NNE at 11 mph 17 km/h.
Wednesday, September 23, 2026
Mid-Morning
63°F 17°C
Partly Cloudy
Mid-Afternoon
74°F 24°C
Sunny
Early-Evening
66°F 19°C
Sunny
Mild with a high of 74°F 24°C, partly cloudy in the morning, becoming sunny through the afternoon and evening, with steady humidity and steady pressure. Winds shifting from the NNE to the NE at 12 mph 18 km/h. Gusts up to 21 mph 34 km/h.
Thursday, September 24, 2026
Mid-Morning
59°F 15°C
Fog
Mid-Afternoon
71°F 22°C
Partly Cloudy
Early-Evening
67°F 20°C
Partly Cloudy
Pleasant near 71°F 22°C, overcast in the morning, becoming partly cloudy through the afternoon and evening, with steady humidity and steady pressure. Winds turning from the NNE to the NE at 9 mph 14 km/h.
Friday, September 25, 2026
Mid-Morning
62°F 17°C
Light Fog
Mid-Afternoon
72°F 22°C
Overcast
Early-Evening
64°F 18°C
Overcast
Comfortable with temperatures reaching 72°F 22°C, cloudy in the morning, becoming overcast through the afternoon and evening, with lower humidity and steady pressure. Winds switching from the E to the NE at 12 mph 19 km/h. Gusts up to 22 mph 34 km/h.
Saturday, September 26, 2026
Mid-Morning
62°F 17°C
Scattered Showers
Mid-Afternoon
76°F 25°C
Overcast
Early-Evening
69°F 20°C
Overcast
Enjoyable around 76°F 25°C, scattered downpours possible, with steady humidity and steady pressure. Winds blowing from the ENE at 8 mph 13 km/h.
Sunday, September 27, 2026
Mid-Morning
55°F 13°C
Overcast
Mid-Afternoon
65°F 19°C
Cloudy
Early-Evening
70°F 22°C
Partly Cloudy
Refreshing around 65°F 19°C, overcast in the morning, cloudy in the afternoon, and overcast this evening, with lower humidity and steady pressure.
Monday, September 28, 2026
Mid-Morning
68°F 20°C
Cloudy
Mid-Afternoon
84°F 29°C
Sunny
Early-Evening
76°F 24°C
Overcast
Very warm with a high of 84°F 29°C, partly cloudy in the morning, cloudy in the afternoon, and overcast this evening, with lower humidity and steady pressure.
Tuesday, September 29, 2026
Mid-Morning
65°F 19°C
Overcast
Mid-Afternoon
62°F 17°C
Scattered Showers
Early-Evening
58°F 14°C
Light Showers
Comfortable at 62°F 17°C, scattered downpours possible, with increasing humidity and steady pressure.
Wednesday, September 30, 2026
Mid-Morning
60°F 16°C
Light Fog
Mid-Afternoon
66°F 19°C
Scattered Showers
Early-Evening
63°F 18°C
Scattered Showers
Cool with a high near 66°F 19°C, locally heavy downpours at times, with lower humidity and steady pressure. Winds swinging from the N to the NNE at 6 mph 9 km/h.
Thursday, October 1, 2026
Mid-Morning
59°F 15°C
Fog
Mid-Afternoon
71°F 21°C
Sunny
Early-Evening
65°F 18°C
Partly Cloudy
Enjoyable around 71°F 21°C, partly cloudy through the afternoon, turning overcast this evening, with lower humidity and steady pressure.
Friday, October 2, 2026
Mid-Morning
60°F 16°C
Light Fog
Mid-Afternoon
67°F 19°C
Scattered Showers
Early-Evening
63°F 17°C
Overcast
Mildly cool near 67°F 19°C, scattered downpours possible, with steady humidity and steady pressure.
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