Weather World
Jefferson, IL 14 Day Weather - WeatherWorld.com
Quick Weather Clicks
Settings
Sun & Moon
Jefferson, IL Weather Forecast
Jefferson, IL Weather Forecast Dated: 1036 AM Sun Sep 20 2026
Expect a cool pattern with a mix of sun and clouds and mostly dry weather over the coming period. moderate humidity and no major pressure swings will dominate.
Sunday, September 20, 2026
Mid-Morning
63°F 17°C
Light Showers
Mid-Afternoon
62°F 17°C
Light Showers
Early-Evening
61°F 16°C
Scattered Showers
Refreshing around 62°F 17°C, periods of heavy rain and gusty conditions, with lower humidity and barometric pressure rising. Winds out of the NE at 14 mph 22 km/h. Gusts up to 27 mph 43 km/h.
Monday, September 21, 2026
Mid-Morning
59°F 15°C
Overcast
Mid-Afternoon
59°F 15°C
Scattered Showers
Early-Evening
62°F 17°C
Overcast
Mildly cool near 59°F 15°C, scattered downpours possible, with lower humidity and steady pressure. Winds blowing from the ENE at 11 mph 18 km/h.
Tuesday, September 22, 2026
Mid-Morning
58°F 14°C
Overcast
Mid-Afternoon
63°F 17°C
Overcast
Early-Evening
62°F 17°C
Partly Cloudy
Comfortable at 63°F 17°C, overcast through the afternoon, turning partly cloudy this evening, with steady humidity and steady pressure. Winds NE at 13 mph 21 km/h. Gusts up to 20 mph 32 km/h.
Wednesday, September 23, 2026
Mid-Morning
59°F 15°C
Scattered Showers
Mid-Afternoon
61°F 16°C
Overcast
Early-Evening
62°F 17°C
Partly Cloudy
Cool with a high near 61°F 16°C, periods of heavy rain and gusty conditions, with lower humidity and steady pressure. Winds swinging from the ENE to the NE at 9 mph 14 km/h.
Thursday, September 24, 2026
Mid-Morning
59°F 15°C
Partly Cloudy
Mid-Afternoon
66°F 19°C
Cloudy
Early-Evening
64°F 18°C
Overcast
Refreshing around 66°F 19°C, partly cloudy in the morning, cloudy in the afternoon, and overcast this evening, with steady humidity and steady pressure. Winds shifting from the E to the ENE at 6 mph 10 km/h.
Friday, September 25, 2026
Mid-Morning
63°F 17°C
Scattered Showers
Mid-Afternoon
66°F 19°C
Scattered Showers
Early-Evening
63°F 18°C
Scattered Showers
Mildly cool near 66°F 19°C, locally heavy downpours at times, with steady humidity and steady pressure. Winds NE at 8 mph 13 km/h.
Saturday, September 26, 2026
Mid-Morning
64°F 18°C
Sunny
Mid-Afternoon
69°F 21°C
Sunny
Early-Evening
64°F 18°C
Sunny
Comfortable with temperatures reaching 69°F 21°C, sunny throughout the day, with steady humidity and steady pressure.
Sunday, September 27, 2026
Mid-Morning
65°F 18°C
Sunny
Mid-Afternoon
73°F 23°C
Sunny
Early-Evening
69°F 21°C
Cloudy
Enjoyable around 73°F 23°C, sunny in the morning, cloudy in the afternoon, and partly cloudy this evening, with lower humidity and barometric pressure falling. Winds switching from the SE to the SSE at 9 mph 14 km/h.
Monday, September 28, 2026
Mid-Morning
64°F 18°C
Overcast
Mid-Afternoon
56°F 13°C
Heavy Rain Showers
Early-Evening
51°F 11°C
Scattered Showers
Brisk around 56°F 13°C, locally heavy downpours at times, with increasing humidity and steady pressure. Winds moving from the S to the W at 13 mph 22 km/h. Gusts up to 23 mph 38 km/h.
Tuesday, September 29, 2026
Mid-Morning
47°F 9°C
Sunny
Mid-Afternoon
56°F 14°C
Sunny
Early-Evening
54°F 13°C
Overcast
Cool and brisk at 56°F 14°C, sunny in the morning, cloudy in the afternoon, and overcast this evening, with lower humidity and steady pressure. Winds swinging from the W to the SSW at 6 mph 10 km/h.
Wednesday, September 30, 2026
Mid-Morning
58°F 14°C
Overcast
Mid-Afternoon
65°F 18°C
Partly Cloudy
Early-Evening
59°F 15°C
Sunny
Comfortable at 65°F 18°C, overcast in the morning, sunny in the afternoon, and cloudy this evening, with increasing humidity and steady pressure. Winds shifting from the S to the WNW at 12 mph 19 km/h. Gusts up to 22 mph 35 km/h.
Thursday, October 1, 2026
Mid-Morning
54°F 12°C
Sunny
Mid-Afternoon
65°F 18°C
Sunny
Early-Evening
60°F 16°C
Sunny
Cool with a high near 65°F 18°C, sunny throughout the day, with steady humidity and steady pressure. Winds turning from the WSW to the W at 10 mph 17 km/h. Gusts up to 21 mph 34 km/h.
Friday, October 2, 2026
Mid-Morning
54°F 12°C
Sunny
Mid-Afternoon
62°F 17°C
Sunny
Early-Evening
59°F 15°C
Sunny
Refreshing around 62°F 17°C, sunny throughout the day, with steady humidity and steady pressure. Winds WNW at 9 mph 15 km/h.
Saturday, October 3, 2026
Mid-Morning
56°F 13°C
Partly Cloudy
Mid-Afternoon
63°F 17°C
Overcast
Early-Evening
60°F 16°C
Overcast
Mildly cool near 63°F 17°C, cloudy in the morning, becoming overcast through the afternoon and evening, with steady humidity and steady pressure.
Jefferson, IL Weather Radar Map
Use the map search tool if you want to place a location marker on the radar map...