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Lyndon, IL Weather Forecast
Lyndon, IL Weather Forecast Dated: 510 PM Wed Sep 09 2026
Expect a mild stretch with more clouds than sun and frequent chances of rain over the coming period. generally humid conditions and no major pressure swings will dominate. Isolated storms at times.
Wednesday, September 9, 2026
Mid-Morning
72°F 22°C
Heavy Rain
Mid-Afternoon
80°F 27°C
Heavy Rain
Early-Evening
74°F 23°C
Scattered Showers
Warm and summery around 80°F 27°C (feels like 86°F 30°C), periods of heavy rain and gusty conditions, with lower humidity and steady pressure. Thunderstorms possible in the afternoon and evening. Winds turning from the SSW to the NW at 6 mph 10 km/h.
Thursday, September 10, 2026
Mid-Morning
67°F 19°C
Overcast
Mid-Afternoon
78°F 25°C
Sunny
Early-Evening
73°F 22°C
Sunny
Comfortable with temperatures reaching 78°F 25°C, overcast in the morning, becoming sunny through the afternoon and evening, with steady humidity and steady pressure.
Friday, September 11, 2026
Mid-Morning
66°F 19°C
Sunny
Mid-Afternoon
78°F 26°C
Sunny
Early-Evening
72°F 23°C
Sunny
Enjoyable around 78°F 26°C, sunny throughout the day, with steady humidity and barometric pressure falling. Winds switching from the SSE to the SE at 7 mph 11 km/h.
Saturday, September 12, 2026
Mid-Morning
69°F 21°C
Sunny
Mid-Afternoon
83°F 28°C
Scattered Showers
Early-Evening
72°F 22°C
Light Showers
Warm and summery around 83°F 28°C (feels like 86°F 30°C), periods of heavy rain and gusty conditions, with steady humidity and steady pressure. Winds moving from the SSW to the NNW at 8 mph 13 km/h.
Sunday, September 13, 2026
Mid-Morning
64°F 18°C
Overcast
Mid-Afternoon
77°F 25°C
Overcast
Early-Evening
74°F 23°C
Scattered Showers
Mild with a high of 77°F 25°C, scattered downpours possible, with steady humidity and steady pressure. Winds swinging from the NE to the E at 8 mph 13 km/h.
Monday, September 14, 2026
Mid-Morning
69°F 21°C
Light Showers
Mid-Afternoon
83°F 28°C
Overcast
Early-Evening
78°F 26°C
Nearby Thunderstorms
Very warm near 83°F 28°C, though humidity makes it feel like 90°F 32°C, locally heavy downpours at times, with steady humidity and steady pressure. A stray shower or storm late in the day. Winds shifting from the SE to the W at 5 mph 8 km/h.
Tuesday, September 15, 2026
Mid-Morning
59°F 15°C
Cloudy
Mid-Afternoon
66°F 19°C
Overcast
Early-Evening
65°F 18°C
Overcast
Comfortable at 66°F 19°C, overcast throughout the day, with steady humidity and steady pressure. Winds turning from the NNW to the NNE at 6 mph 10 km/h.
Wednesday, September 16, 2026
Mid-Morning
62°F 17°C
Sunny
Mid-Afternoon
69°F 20°C
Overcast
Early-Evening
65°F 18°C
Overcast
Enjoyable around 69°F 20°C, cloudy in the morning, overcast in the afternoon, and cloudy this evening, with steady humidity and steady pressure. Winds out of the E at 6 mph 10 km/h.
Thursday, September 17, 2026
Mid-Morning
59°F 15°C
Scattered Showers
Mid-Afternoon
66°F 19°C
Overcast
Early-Evening
66°F 20°C
Overcast
Refreshing around 66°F 19°C, locally heavy downpours at times, with steady humidity and steady pressure.
Friday, September 18, 2026
Mid-Morning
65°F 19°C
Light Fog
Mid-Afternoon
77°F 25°C
Sunny
Early-Evening
74°F 23°C
Partly Cloudy
Mild with a high of 77°F 25°C, sunny in the morning, partly cloudy in the afternoon, and cloudy this evening, with steady humidity and barometric pressure falling. Winds moving from the SE to the SSE at 8 mph 12 km/h.
Saturday, September 19, 2026
Mid-Morning
75°F 24°C
Scattered Showers
Mid-Afternoon
87°F 30°C
Sunny
Early-Evening
77°F 25°C
Partly Cloudy
Quite warm reaching 87°F 30°C, feeling like 92°F 33°C during peak afternoon, scattered downpours possible, with steady humidity and steady pressure. Winds swinging from the W to the NNW at 7 mph 11 km/h.
Sunday, September 20, 2026
Mid-Morning
68°F 20°C
Light Fog
Mid-Afternoon
76°F 25°C
Scattered Showers
Early-Evening
73°F 23°C
Scattered Showers
Comfortable with temperatures reaching 76°F 25°C, locally heavy downpours at times, with steady humidity and steady pressure.
Monday, September 21, 2026
Mid-Morning
69°F 21°C
Light Fog
Mid-Afternoon
77°F 25°C
Scattered Showers
Early-Evening
69°F 21°C
Scattered Showers
Enjoyable around 77°F 25°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure. Winds out of the ENE at 7 mph 12 km/h.
Tuesday, September 22, 2026
Mid-Morning
67°F 19°C
Fog
Mid-Afternoon
75°F 24°C
Scattered Showers
Early-Evening
72°F 22°C
Light Showers
Mild temperatures up to 75°F 24°C, scattered downpours possible, with lower humidity and steady pressure. Winds turning from the ESE to the W at 8 mph 12 km/h.
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