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Union, IL Weather Forecast


Union, IL Weather Forecast Dated: 332 AM Sat Sep 05 2026
Expect a mild stretch with a mix of sun and clouds and occasional showers over the coming period. generally humid conditions and no major pressure swings will dominate. Isolated storms at times.
Saturday, September 5, 2026
Mid-Morning
78°F 26°C
Scattered Showers
Mid-Afternoon
74°F 23°C
Scattered Showers
Early-Evening
70°F 21°C
Partly Cloudy
Pleasant near 74°F 23°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure. Winds out of the NE at 9 mph 15 km/h. Gusts up to 20 mph 31 km/h.
Sunday, September 6, 2026
Mid-Morning
66°F 19°C
Sunny
Mid-Afternoon
73°F 23°C
Sunny
Early-Evening
66°F 19°C
Sunny
Comfortable with temperatures reaching 73°F 23°C, sunny throughout the day, with steady humidity and steady pressure. Winds blowing from the ENE at 12 mph 19 km/h.
Monday, September 7, 2026
Mid-Morning
65°F 19°C
Sunny
Mid-Afternoon
74°F 23°C
Overcast
Early-Evening
67°F 20°C
Overcast
Enjoyable around 74°F 23°C, sunny in the morning, becoming overcast through the afternoon and evening, with steady humidity and steady pressure. Winds moving from the ESE to the E at 9 mph 14 km/h.
Tuesday, September 8, 2026
Mid-Morning
67°F 19°C
Sunny
Mid-Afternoon
79°F 26°C
Partly Cloudy
Early-Evening
79°F 27°C
Partly Cloudy
Mild temperatures up to 79°F 26°C, sunny in the morning, becoming partly cloudy through the afternoon and evening, with lower humidity and barometric pressure falling. Winds swinging from the SSE to the S at 13 mph 21 km/h. Gusts up to 31 mph 49 km/h.
Wednesday, September 9, 2026
Mid-Morning
71°F 22°C
Scattered Showers
Mid-Afternoon
83°F 29°C
Partly Cloudy
Early-Evening
76°F 24°C
Overcast
Very warm with a high of 83°F 29°C, scattered downpours possible, with lower humidity and steady pressure. Winds shifting from the NW to the W at 11 mph 16 km/h. Gusts up to 24 mph 40 km/h.
Thursday, September 10, 2026
Mid-Morning
61°F 16°C
Overcast
Mid-Afternoon
71°F 22°C
Sunny
Early-Evening
66°F 19°C
Overcast
Pleasant near 71°F 22°C, overcast in the morning, cloudy in the afternoon, and overcast this evening, with steady humidity and steady pressure. Winds turning from the N to the ENE at 7 mph 11 km/h.
Friday, September 11, 2026
Mid-Morning
59°F 15°C
Overcast
Mid-Afternoon
66°F 19°C
Cloudy
Early-Evening
61°F 16°C
Overcast
Comfortable at 66°F 19°C, overcast throughout the day, with lower humidity and barometric pressure falling. Winds switching from the ESE to the ENE at 11 mph 17 km/h.
Saturday, September 12, 2026
Mid-Morning
61°F 16°C
Overcast
Mid-Afternoon
69°F 21°C
Sunny
Early-Evening
64°F 18°C
Sunny
Enjoyable around 69°F 21°C, overcast in the morning, becoming sunny through the afternoon and evening, with steady humidity and steady pressure. Winds blowing from the E at 14 mph 22 km/h.
Sunday, September 13, 2026
Mid-Morning
61°F 16°C
Sunny
Mid-Afternoon
74°F 24°C
Sunny
Early-Evening
70°F 21°C
Sunny
Mild temperatures up to 74°F 24°C, sunny throughout the day, with steady humidity and steady pressure. Winds SSE at 12 mph 19 km/h.
Monday, September 14, 2026
Mid-Morning
69°F 21°C
Overcast
Mid-Afternoon
83°F 28°C
Sunny
Early-Evening
81°F 27°C
Sunny
Very warm with a high of 83°F 28°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 SSW at 7 mph 11 km/h.
Tuesday, September 15, 2026
Mid-Morning
78°F 26°C
Sunny
Mid-Afternoon
88°F 31°C
Scattered Showers
Early-Evening
80°F 27°C
Sunny
Quite warm reaching 88°F 31°C, feeling like 92°F 34°C during peak afternoon, scattered downpours possible, with steady humidity and steady pressure. Winds turning from the ESE to the E at 8 mph 13 km/h.
Wednesday, September 16, 2026
Mid-Morning
78°F 26°C
Overcast
Mid-Afternoon
90°F 32°C
Cloudy
Early-Evening
83°F 28°C
Nearby Thunderstorms
Very hot with a high of 90°F 32°C, feeling closer to 93°F 34°C in the humidity, heavy thunderstorms conditions at times, with steady humidity and steady pressure.
Thursday, September 17, 2026
Mid-Morning
66°F 19°C
Fog
Mid-Afternoon
77°F 25°C
Scattered Showers
Early-Evening
74°F 23°C
Overcast
Enjoyable around 77°F 25°C, periods of heavy rain and gusty conditions, with lower humidity and barometric pressure falling.
Friday, September 18, 2026
Mid-Morning
64°F 18°C
Overcast
Mid-Afternoon
68°F 20°C
Overcast
Early-Evening
63°F 17°C
Overcast
Mild temperatures up to 68°F 20°C, overcast through the afternoon, turning cloudy this evening, with steady humidity and steady pressure. Winds ENE at 12 mph 19 km/h.
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