Weather Alert
Waterloo Weather Warning NWS WEATHER ALERT FOR THE WATERLOO, IL AREA - Issued: 1229 PM CDT Sat Sep 5 2026 Waterloo Weather Warning

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Waterloo, IL Weather - Hour by Hour Forecast

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Waterloo, IL Weather - Hour by Hour Forecast

24 Hour Forecast

Current Conditions - Clear. Temperature is 100°F38°C, dew point 68°F20°C, humidity 35%. Wind direction is NNW at 9 mph14 km/h with visibility of 10 mi16 km. Barometric pressure is 29.9 in1013 mb.
Today - Sunny, hot. Near steady temperature in the upper 90s. Northwest winds around 5 mph. Heat index values up to 108... Full Forecast
Tonight - Partly cloudy in the evening, then clearing. Humid with lows in the lower 70s. Northeast winds around 5 mph. Heat index values up .. Full Forecast

Waterloo Hourly Weather

24 Hour Forecast Scroll
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Waterloo, IL Hourly Weather - Mostly Clear - 2:00 PM Waterloo, IL Hourly Weather - Mostly Clear - 3:00 PM Waterloo, IL Hourly Weather - Mostly Clear - 4:00 PM Waterloo, IL Hourly Weather - Mostly Clear - 5:00 PM Waterloo, IL Hourly Weather - Partly Cloudy - 6:00 PM Waterloo, IL Hourly Weather - Partly Cloudy - 7:00 PM Waterloo, IL Hourly Weather - Partly Cloudy - 8:00 PM Waterloo, IL Hourly Weather - Clear - 9:00 PM Waterloo, IL Hourly Weather - Clear - 10:00 PM Waterloo, IL Hourly Weather - Clear - 11:00 PM Waterloo, IL Hourly Weather - Mostly Clear - 12:00 AM Waterloo, IL Hourly Weather - Mostly Clear - 1:00 AM Waterloo, IL Hourly Weather - Mostly Clear - 2:00 AM Waterloo, IL Hourly Weather - Mostly Clear - 3:00 AM Waterloo, IL Hourly Weather - Mostly Clear - 4:00 AM Waterloo, IL Hourly Weather - Mostly Clear - 5:00 AM Waterloo, IL Hourly Weather - Mostly Cloudy - 6:00 AM Waterloo, IL Hourly Weather - Mostly Cloudy - 7:00 AM Waterloo, IL Hourly Weather - Mostly Cloudy - 8:00 AM Waterloo, IL Hourly Weather - Clear - 9:00 AM Waterloo, IL Hourly Weather - Clear - 10:00 AM Waterloo, IL Hourly Weather - Clear - 11:00 AM Waterloo, IL Hourly Weather - Clear - 12:00 PM Waterloo, IL Hourly Weather - Clear - 1:00 PM
Mostly Clear Mostly Clear Mostly Clear Mostly Clear Partly Cloudy Partly Cloudy Partly Cloudy Clear Clear Clear Mostly Clear Mostly Clear Mostly Clear Mostly Clear Mostly Clear Mostly Clear Mostly Cloudy Mostly Cloudy Mostly Cloudy Clear Clear Clear Clear Clear
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4% 4% 4% 4% 4% 4% 11% 11% 11% 11% 11% 11% 0% 0% 0% 0% 0% 0% 2% 2% 2% 2% 2% 2%
69°F21°C 69°F21°C 69°F21°C 69°F21°C 70°F21°C 70°F21°C 70°F21°C 71°F22°C 71°F22°C 71°F22°C 71°F22°C 71°F22°C 71°F22°C 70°F21°C 70°F21°C 70°F21°C 71°F22°C 71°F22°C 70°F21°C 70°F21°C 69°F21°C 68°F20°C 66°F19°C 65°F18°C
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NW NNW NNW N N N SSW SE NE NE NE ENE NE NE NE NE NE NE NE NE ENE ENE NE NE
5 mph 7 mph 7 mph 7 mph 5 mph 5 mph 5 mph 3 mph 3 mph 3 mph 3 mph 3 mph 3 mph 4 mph 4 mph 4 mph 4 mph 4 mph 4 mph 9 mph 9 mph 9 mph 11 mph 11 mph
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Hour (CDT)
Weather
Clouds
Temperature
Precip. Type
POP
Dewpoint
Humidity
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Wind Speed
Visibility
POP = Probability of Precipitation. ** Indicates missing data/values from KCPS model statistics.

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Prob Precip % = Probability of Precipitation.

Waterloo 36 Hour Forecast

POP = Probability of Precipitation. ** Indicates missing data/values from model statistics.

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