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Waterloo, IL Weather Forecast


Waterloo, IL Weather Forecast Dated: 948 PM Wed Sep 02 2026 (Waterloo Time)
Expect a hot stretch with plenty of sunshine and mostly dry weather over the coming period. comfortable humidity and no major pressure swings will dominate. Isolated storms at times.
Wednesday, September 2, 2026
Mid-Morning
86°F 30°C
Sunny
Mid-Afternoon
102°F 39°C
Sunny
Early-Evening
89°F 32°C
Sunny
Scorching heat reaching 102°F 39°C, feeling like 113°F 45°C, sunny throughout the day, with steady humidity and steady pressure. Winds turning from the SW to the SSW at 7 mph 11 km/h.
Thursday, September 3, 2026
Mid-Morning
86°F 30°C
Sunny
Mid-Afternoon
99°F 37°C
Partly Cloudy
Early-Evening
94°F 35°C
Partly Cloudy
Hot and sweltering around 99°F 37°C, sunny in the morning, partly cloudy in the afternoon, and cloudy this evening, with steady humidity and barometric pressure falling. Winds switching from the W to the SSW at 9 mph 14 km/h.
Friday, September 4, 2026
Mid-Morning
86°F 30°C
Sunny
Mid-Afternoon
101°F 38°C
Partly Cloudy
Early-Evening
93°F 34°C
Sunny
Dangerously hot temperatures around 101°F 38°C, sunny in the morning, partly cloudy in the afternoon, and sunny this evening, with steady humidity and steady pressure. Winds moving from the W to the WSW at 6 mph 10 km/h.
Saturday, September 5, 2026
Mid-Morning
88°F 31°C
Sunny
Mid-Afternoon
103°F 40°C
Overcast
Early-Evening
94°F 34°C
Overcast
Dangerously hot with a high of 103°F 40°C, sunny in the morning, becoming overcast through the afternoon and evening, with lower humidity and steady pressure.
Sunday, September 6, 2026
Mid-Morning
84°F 29°C
Sunny
Mid-Afternoon
100°F 38°C
Sunny
Early-Evening
89°F 31°C
Sunny
Sweltering temperatures near 100°F 38°C with a heat index of 104°F 40°C, sunny through the afternoon, turning cloudy this evening, with lower humidity and steady pressure. Winds picking up from NE at 6 mph 10 km/h to ENE at 14 mph 22 km/h. Gusts up to 26 mph 42 km/h.
Monday, September 7, 2026
Mid-Morning
76°F 24°C
Sunny
Mid-Afternoon
97°F 36°C
Sunny
Early-Evening
91°F 33°C
Sunny
Very hot with temperatures reaching 97°F 36°C, sunny throughout the day, with lower humidity and steady pressure. Winds blowing from the ESE at 6 mph 10 km/h.
Tuesday, September 8, 2026
Mid-Morning
82°F 28°C
Overcast
Mid-Afternoon
102°F 39°C
Sunny
Early-Evening
96°F 36°C
Sunny
Dangerously hot temperatures around 102°F 39°C, overcast in the morning, sunny in the afternoon, and cloudy this evening, with lower humidity and steady pressure. Winds turning from the S to the SW at 7 mph 11 km/h.
Wednesday, September 9, 2026
Mid-Morning
91°F 33°C
Overcast
Mid-Afternoon
102°F 39°C
Sunny
Early-Evening
91°F 33°C
Sunny
Dangerously hot with a high of 102°F 39°C, cloudy in the morning, sunny in the afternoon, and cloudy this evening, with steady humidity and steady pressure. Winds out of the SW at 10 mph 16 km/h.
Thursday, September 10, 2026
Mid-Morning
85°F 30°C
Sunny
Mid-Afternoon
103°F 39°C
Sunny
Early-Evening
94°F 34°C
Sunny
Scorching hot near 103°F 39°C, cloudy in the morning, sunny in the afternoon, and overcast this evening, with lower humidity and barometric pressure falling.
Friday, September 11, 2026
Mid-Morning
87°F 31°C
Sunny
Mid-Afternoon
99°F 37°C
Scattered Showers
Early-Evening
93°F 34°C
Sunny
Very hot with a high of 99°F 37°C, periods of heavy rain and gusty conditions, with lower humidity and steady pressure. Winds moving from the SSW to the S at 9 mph 14 km/h.
Saturday, September 12, 2026
Mid-Morning
86°F 30°C
Sunny
Mid-Afternoon
100°F 38°C
Sunny
Early-Evening
92°F 33°C
Overcast
Dangerously hot temperatures around 100°F 38°C, sunny in the morning, cloudy in the afternoon, and sunny this evening, with steady humidity and steady pressure. Winds SW at 17 mph 28 km/h. Gusts up to 25 mph 41 km/h.
Sunday, September 13, 2026
Mid-Morning
89°F 32°C
Sunny
Mid-Afternoon
103°F 40°C
Sunny
Early-Evening
96°F 36°C
Sunny
Dangerously hot with a high of 103°F 40°C, sunny through the afternoon, turning partly cloudy this evening, with steady humidity and steady pressure. Winds shifting from the SW to the WSW at 5 mph 8 km/h.
Monday, September 14, 2026
Mid-Morning
79°F 26°C
Light Showers
Mid-Afternoon
96°F 35°C
Partly Cloudy
Early-Evening
87°F 31°C
Partly Cloudy
Sizzling hot with 96°F 35°C, early showers breaking for a drier afternoon, with lower humidity and steady pressure. Winds turning from the WSW to the SSW at 9 mph 14 km/h.
Tuesday, September 15, 2026
Mid-Morning
78°F 26°C
Sunny
Mid-Afternoon
100°F 38°C
Sunny
Early-Evening
93°F 34°C
Sunny
Sweltering heat reaching 100°F 38°C, partly cloudy in the morning, becoming sunny through the afternoon and evening, with lower humidity and barometric pressure falling.
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