Mercer, IL 14 Day Weather - WeatherWorld.com
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Mercer, IL Weather Forecast


Mercer, IL Weather Forecast Dated: 311 PM Sat Sep 26 2026
Expect a cool pattern with a mix of sun and clouds and occasional showers over the coming period. generally humid conditions and a stable pattern will dominate.
Saturday, September 26, 2026
Mid-Morning
55°F 13°C
Overcast
Mid-Afternoon
64°F 18°C
Overcast
Early-Evening
62°F 16°C
Sunny
Refreshing around 64°F 18°C, overcast through the afternoon, turning partly cloudy this evening, with steady humidity and steady pressure. Winds out of the SE at 8 mph 12 km/h.
Sunday, September 27, 2026
Mid-Morning
58°F 15°C
Partly Cloudy
Mid-Afternoon
71°F 22°C
Sunny
Early-Evening
66°F 19°C
Sunny
Comfortable with temperatures reaching 71°F 22°C, partly cloudy in the morning, becoming sunny through the afternoon and evening, with steady humidity and steady pressure.
Monday, September 28, 2026
Mid-Morning
57°F 14°C
Sunny
Mid-Afternoon
71°F 22°C
Sunny
Early-Evening
67°F 19°C
Sunny
Enjoyable around 71°F 22°C, sunny throughout the day, with steady humidity and barometric pressure falling.
Tuesday, September 29, 2026
Mid-Morning
63°F 17°C
Overcast
Mid-Afternoon
69°F 20°C
Overcast
Early-Evening
66°F 19°C
Drizzle
Mild temperatures up to 69°F 20°C, drier conditions through late afternoon before showers move in, with steady humidity and steady pressure. Winds tapering down from SSE 11 mph 18 km/h to E 3 mph 4 km/h.
Wednesday, September 30, 2026
Mid-Morning
64°F 18°C
Light Showers
Mid-Afternoon
64°F 18°C
Light Showers
Early-Evening
65°F 19°C
Light Showers
Refreshing around 64°F 18°C, persistent showers off and on through the day, with steady humidity and steady pressure. Winds moving from the SW to the SE at 9 mph 14 km/h. Gusts up to 21 mph 34 km/h.
Thursday, October 1, 2026
Mid-Morning
67°F 19°C
Light Showers
Mid-Afternoon
68°F 20°C
Heavy Rain Showers
Early-Evening
67°F 19°C
Scattered Showers
Pleasant near 68°F 20°C, locally heavy downpours at times, with steady humidity and steady pressure. Winds swinging from the SSW to the SSE at 9 mph 14 km/h. Gusts up to 20 mph 32 km/h.
Friday, October 2, 2026
Mid-Morning
63°F 17°C
Light Showers
Mid-Afternoon
61°F 16°C
Scattered Showers
Early-Evening
60°F 16°C
Scattered Showers
Comfortable at 61°F 16°C, periods of heavy rain and gusty conditions, with steady humidity and barometric pressure rising. Winds blowing from the NE at 15 mph 23 km/h. Gusts up to 24 mph 38 km/h.
Saturday, October 3, 2026
Mid-Morning
62°F 16°C
Light Fog
Mid-Afternoon
72°F 22°C
Scattered Showers
Early-Evening
70°F 21°C
Overcast
Enjoyable around 72°F 22°C, scattered downpours possible, with steady humidity and steady pressure. Winds turning from the SSE to the W at 10 mph 16 km/h.
Sunday, October 4, 2026
Mid-Morning
48°F 9°C
Overcast
Mid-Afternoon
56°F 13°C
Sunny
Early-Evening
53°F 12°C
Sunny
Brisk around 56°F 13°C, overcast in the morning, sunny in the afternoon, and partly cloudy this evening, with steady humidity and steady pressure. Winds easing from NNW 16 mph 26 km/h to NNW 7 mph 12 km/h.
Monday, October 5, 2026
Mid-Morning
43°F 6°C
Overcast
Mid-Afternoon
49°F 9°C
Cloudy
Early-Evening
46°F 8°C
Sunny
Cool and brisk at 49°F 9°C, partly cloudy throughout the day, with steady humidity and steady pressure. Winds moving from the N to the NNW at 8 mph 13 km/h.
Tuesday, October 6, 2026
Mid-Morning
42°F 6°C
Partly Cloudy
Mid-Afternoon
47°F 9°C
Sunny
Early-Evening
43°F 6°C
Sunny
Chilly near 47°F 9°C, partly cloudy in the morning, becoming sunny through the afternoon and evening, with steady humidity and steady pressure. Winds NNW at 12 mph 19 km/h.
Wednesday, October 7, 2026
Mid-Morning
38°F 4°C
Sunny
Mid-Afternoon
46°F 8°C
Sunny
Early-Evening
43°F 6°C
Cloudy
Crisp with a high near 46°F 8°C, sunny in the morning, partly cloudy in the afternoon, and sunny this evening, with steady humidity and steady pressure. Winds shifting from the NNE to the N at 6 mph 9 km/h.
Thursday, October 8, 2026
Mid-Morning
40°F 4°C
Sunny
Mid-Afternoon
50°F 10°C
Sunny
Early-Evening
46°F 8°C
Sunny
Brisk around 50°F 10°C, sunny throughout the day, with steady humidity and barometric pressure falling. Winds turning from the SW to the SSW at 8 mph 13 km/h.
Friday, October 9, 2026
Mid-Morning
46°F 8°C
Overcast
Mid-Afternoon
58°F 14°C
Sunny
Early-Evening
54°F 12°C
Sunny
Mildly cool near 58°F 14°C, cloudy in the morning, sunny in the afternoon, and partly cloudy this evening, with increasing humidity and steady pressure. Winds switching from the SW to the NE at 4 mph 6 km/h.
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