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Jefferson Weather Warning NWS WEATHER ALERT FOR THE JEFFERSON, IL AREA - Issued: 409 PM CDT Mon Sep 21 2026 Jefferson Weather Warning

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Jefferson, IL Weather - Hour by Hour Forecast

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Jefferson, IL Weather - Hour by Hour Forecast

24 Hour Forecast

Current Conditions - Overcast. Temperature is 63°F17°C, dew point 52°F11°C, humidity 67%. Wind direction is ENE at 16 mph26 km/h with visibility of 10 mi16 km. Barometric pressure is 30.17 in1022 mb.
Tonight - Mostly cloudy. Lows in the mid 50s. Northeast winds 10 to 15 mph... Full Forecast
Tuesday - Mostly cloudy. Highs in the lower 60s. Northeast winds 10 to 15 mph... Full Forecast

Jefferson Hourly Weather

24 Hour Forecast Scroll
Mon, Sep 21
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Jefferson, IL Hourly Weather - Mostly Cloudy - 9:00 PM Jefferson, IL Hourly Weather - Mostly Cloudy - 10:00 PM Jefferson, IL Hourly Weather - Mostly Cloudy - 11:00 PM Jefferson, IL Hourly Weather - Mostly Cloudy - 12:00 AM Jefferson, IL Hourly Weather - Mostly Cloudy - 1:00 AM Jefferson, IL Hourly Weather - Mostly Cloudy - 2:00 AM Jefferson, IL Hourly Weather - Cloudy - 3:00 AM Jefferson, IL Hourly Weather - Cloudy - 4:00 AM Jefferson, IL Hourly Weather - Cloudy - 5:00 AM Jefferson, IL Hourly Weather - Mostly Cloudy - 6:00 AM Jefferson, IL Hourly Weather - Mostly Cloudy - 7:00 AM Jefferson, IL Hourly Weather - Mostly Cloudy - 8:00 AM Jefferson, IL Hourly Weather - Cloudy - 9:00 AM Jefferson, IL Hourly Weather - Cloudy - 10:00 AM Jefferson, IL Hourly Weather - Cloudy - 11:00 AM Jefferson, IL Hourly Weather - Cloudy - 12:00 PM Jefferson, IL Hourly Weather - Cloudy - 1:00 PM Jefferson, IL Hourly Weather - Cloudy - 2:00 PM Jefferson, IL Hourly Weather - Cloudy - 3:00 PM Jefferson, IL Hourly Weather - Cloudy - 4:00 PM Jefferson, IL Hourly Weather - Cloudy - 5:00 PM Jefferson, IL Hourly Weather - Cloudy - 6:00 PM Jefferson, IL Hourly Weather - Cloudy - 7:00 PM Jefferson, IL Hourly Weather - Cloudy - 8:00 PM
Mostly Cloudy Mostly Cloudy Mostly Cloudy Mostly Cloudy Mostly Cloudy Mostly Cloudy Cloudy Cloudy Cloudy Mostly Cloudy Mostly Cloudy Mostly Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy
60°F16°C 59°F15°C 58°F14°C 58°F14°C 57°F14°C 57°F14°C 56°F13°C 56°F13°C 56°F13°C 57°F14°C 57°F14°C 59°F15°C 61°F16°C 63°F17°C 63°F17°C 64°F18°C 64°F18°C 64°F18°C 63°F17°C 63°F17°C 62°F17°C 62°F17°C 61°F16°C 60°F16°C
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7% 7% 7% 7% 7% 2% 2% 2% 2% 2% 2% 3% 3% 3% 3% 3% 3% 3% 3% 3% 3% 3% 3% 5%
44°F7°C 45°F7°C 46°F8°C 47°F8°C 48°F9°C 48°F9°C 49°F9°C 49°F9°C 49°F9°C 50°F10°C 50°F10°C 51°F11°C 51°F11°C 52°F11°C 53°F12°C 53°F12°C 54°F12°C 54°F12°C 55°F13°C 55°F13°C 55°F13°C 55°F13°C 55°F13°C 55°F13°C
55% 60% 64% 67% 72% 72% 77% 77% 77% 77% 77% 75% 70% 67% 70% 67% 70% 70% 75% 75% 78% 78% 81% 84%
NE NE NE NE NE NE NE NE NE NE NE NE NE NE NE ENE ENE ENE ENE ENE ENE ENE ENE ENE
10 mph 10 mph 10 mph 9 mph 9 mph 9 mph 9 mph 9 mph 9 mph 9 mph 9 mph 9 mph 13 mph 13 mph 13 mph 13 mph 13 mph 13 mph 13 mph 13 mph 13 mph 13 mph 13 mph 13 mph
10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km
Hour (CDT)
Weather
Clouds
Temperature
Precip. Type
POP
Dewpoint
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POP = Probability of Precipitation. ** Indicates missing data/values from KORD model statistics.

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Prob Precip % = Probability of Precipitation.

Jefferson 36 Hour Forecast

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

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