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Round Knob IL Weather - Mostly Cloudy - 78°F
Mostly Cloudy
78°F
Updated 10:15 pm
Feels Like 84°F
Humidity 84%
Wind S 5 mph
Barometer  30.04 in
Dew Point 73°F
Round Knob IL Weather - Mostly Cloudy - 26°C
Mostly Cloudy
26°C
Updated 10:15 pm
Feels Like 29°C
Humidity 84%
Wind S 8 km/h
Barometer  101.7 kPa
Dew Point 23°C
Round Knob, IL Weather and Current Conditionsround knob il weather forecast

Round Knob, IL Weather Forecast

Round Knob Illinois WeatherRound Knob, Illinois Weather Weather Forecast
14 day API forecast for Round Knob, Illinois. Note. The 7-day weather forecast for Round Knob, IL is the most reliable and accurate forecast. This model should only be used as a likely scenario. It is difficult to predict weather more than 7 days in advance.
Round Knob, IL Weather Forecast Dated: 1015 PM Wed Sep 09 2026
Expect a very warm period with a mix of sun and clouds and frequent chances of rain over the coming period. moderate humidity and no major pressure swings will dominate. Isolated storms at times.

Wednesday, September 9, 2026

Mid-Morning
Round Knob Weather - 2026-09-09 - Morning - Sunny
82°F 28°C
Sunny
Mid-Afternoon
Round Knob Weather - 2026-09-09 - Afternoon - Partly Cloudy
96°F 36°C
Partly Cloudy
Early-Evening
Round Knob Weather - 2026-09-09 - Evening - Partly Cloudy
89°F 31°C
Partly Cloudy
Sizzling hot near 96°F 36°C with a heat index reaching 105°F 41°C, sunny in the morning, partly cloudy in the afternoon, and cloudy this evening, with lower humidity and barometric pressure falling. Winds easing from SW 13 mph 20 km/h to N 5 mph 9 km/h.

Thursday, September 10, 2026

Mid-Morning
Round Knob Weather - 2026-09-10 - Morning - Scattered Showers
75°F 24°C
Scattered Showers
Mid-Afternoon
Round Knob Weather - 2026-09-10 - Afternoon - Scattered Showers
90°F 32°C
Scattered Showers
Early-Evening
Round Knob Weather - 2026-09-10 - Evening - Heavy Rain Showers
71°F 22°C
Heavy Rain Showers
Hot and sweltering around 90°F 32°C (heat index 93°F 34°C), scattered downpours possible, with increasing humidity and steady pressure. Winds switching from the S to the NE at 8 mph 13 km/h.

Friday, September 11, 2026

Mid-Morning
Round Knob Weather - 2026-09-11 - Morning - Light Fog
69°F 20°C
Light Fog
Mid-Afternoon
Round Knob Weather - 2026-09-11 - Afternoon - Scattered Showers
82°F 28°C
Scattered Showers
Early-Evening
Round Knob Weather - 2026-09-11 - Evening - Overcast
76°F 24°C
Overcast
Very warm near 82°F 28°C, though humidity makes it feel like 85°F 29°C, locally heavy downpours at times, with lower humidity and steady pressure.

Saturday, September 12, 2026

Mid-Morning
Round Knob Weather - 2026-09-12 - Morning - Partly Cloudy
73°F 23°C
Partly Cloudy
Mid-Afternoon
Round Knob Weather - 2026-09-12 - Afternoon - Sunny
89°F 32°C
Sunny
Early-Evening
Round Knob Weather - 2026-09-12 - Evening - Sunny
84°F 29°C
Sunny
Warm and summery around 89°F 32°C (feels like 93°F 34°C), partly cloudy in the morning, becoming sunny through the afternoon and evening, with lower humidity and steady pressure.

Sunday, September 13, 2026

Mid-Morning
Round Knob Weather - 2026-09-13 - Morning - Sunny
79°F 26°C
Sunny
Mid-Afternoon
Round Knob Weather - 2026-09-13 - Afternoon - Overcast
93°F 34°C
Overcast
Early-Evening
Round Knob Weather - 2026-09-13 - Evening - Cloudy
86°F 30°C
Cloudy
Hot and sweltering around 93°F 34°C (heat index 97°F 36°C), sunny in the morning, overcast in the afternoon, and partly cloudy this evening, with lower humidity and steady pressure.

Monday, September 14, 2026

Mid-Morning
Round Knob Weather - 2026-09-14 - Morning - Sunny
82°F 28°C
Sunny
Mid-Afternoon
Round Knob Weather - 2026-09-14 - Afternoon - Sunny
98°F 37°C
Sunny
Early-Evening
Round Knob Weather - 2026-09-14 - Evening - Overcast
88°F 31°C
Overcast
Very hot with a high of 98°F 37°C, feeling closer to 101°F 38°C in the humidity, sunny in the morning, cloudy in the afternoon, and partly cloudy this evening, with lower humidity and steady pressure. Winds moving from the SW to the SSW at 8 mph 13 km/h.

Tuesday, September 15, 2026

Mid-Morning
Round Knob Weather - 2026-09-15 - Morning - Sunny
85°F 29°C
Sunny
Mid-Afternoon
Round Knob Weather - 2026-09-15 - Afternoon - Partly Cloudy
98°F 36°C
Partly Cloudy
Early-Evening
Round Knob Weather - 2026-09-15 - Evening - Sunny
85°F 29°C
Sunny
Sizzling hot near 98°F 36°C with a heat index reaching 102°F 39°C, sunny through the afternoon, turning partly cloudy this evening, with steady humidity and steady pressure. A stray shower or storm late in the day. Winds swinging from the SW to the WNW at 6 mph 10 km/h.

Wednesday, September 16, 2026

Mid-Morning
Round Knob Weather - 2026-09-16 - Morning - Light Showers
71°F 22°C
Light Showers
Mid-Afternoon
Round Knob Weather - 2026-09-16 - Afternoon - Sunny
87°F 31°C
Sunny
Early-Evening
Round Knob Weather - 2026-09-16 - Evening - Partly Cloudy
81°F 27°C
Partly Cloudy
Quite warm reaching 87°F 31°C, feeling like 91°F 33°C during peak afternoon, scattered morning showers before drying out later, with lower humidity and steady pressure. Winds blowing from the NNE at 4 mph 7 km/h.

Thursday, September 17, 2026

Mid-Morning
Round Knob Weather - 2026-09-17 - Morning - Fog
76°F 24°C
Fog
Mid-Afternoon
Round Knob Weather - 2026-09-17 - Afternoon - Overcast
90°F 32°C
Overcast
Early-Evening
Round Knob Weather - 2026-09-17 - Evening - Overcast
81°F 27°C
Overcast
Very hot with a high of 90°F 32°C, feeling closer to 96°F 35°C in the humidity, cloudy in the morning, becoming overcast through the afternoon and evening, with lower humidity and barometric pressure falling.

Friday, September 18, 2026

Mid-Morning
Round Knob Weather - 2026-09-18 - Morning - Overcast
64°F 18°C
Overcast
Mid-Afternoon
Round Knob Weather - 2026-09-18 - Afternoon - Partly Cloudy
72°F 22°C
Partly Cloudy
Early-Evening
Round Knob Weather - 2026-09-18 - Evening - Partly Cloudy
66°F 19°C
Partly Cloudy
Mild with a high of 72°F 22°C, cloudy in the morning, becoming partly cloudy through the afternoon and evening, with lower humidity and steady pressure. Winds turning from the NW to the ESE at 10 mph 16 km/h.

Saturday, September 19, 2026

Mid-Morning
Round Knob Weather - 2026-09-19 - Morning - Sunny
62°F 17°C
Sunny
Mid-Afternoon
Round Knob Weather - 2026-09-19 - Afternoon - Sunny
75°F 24°C
Sunny
Early-Evening
Round Knob Weather - 2026-09-19 - Evening - Sunny
68°F 20°C
Sunny
Pleasant near 75°F 24°C, sunny throughout the day, with lower humidity and steady pressure.

Sunday, September 20, 2026

Mid-Morning
Round Knob Weather - 2026-09-20 - Morning - Sunny
64°F 18°C
Sunny
Mid-Afternoon
Round Knob Weather - 2026-09-20 - Afternoon - Sunny
77°F 25°C
Sunny
Early-Evening
Round Knob Weather - 2026-09-20 - Evening - Sunny
69°F 21°C
Sunny
Comfortable with temperatures reaching 77°F 25°C, sunny throughout the day, with lower humidity and steady pressure.

Monday, September 21, 2026

Mid-Morning
Round Knob Weather - 2026-09-21 - Morning - Sunny
67°F 20°C
Sunny
Mid-Afternoon
Round Knob Weather - 2026-09-21 - Afternoon - Sunny
82°F 28°C
Sunny
Early-Evening
Round Knob Weather - 2026-09-21 - Evening - Sunny
75°F 24°C
Sunny
Quite warm around 82°F 28°C, sunny through the afternoon, turning cloudy this evening, with increasing humidity and steady pressure.

Tuesday, September 22, 2026

Mid-Morning
Round Knob Weather - 2026-09-22 - Morning - Cloudy
73°F 23°C
Cloudy
Mid-Afternoon
Round Knob Weather - 2026-09-22 - Afternoon - Sunny
85°F 30°C
Sunny
Early-Evening
Round Knob Weather - 2026-09-22 - Evening - Sunny
78°F 25°C
Sunny
Warm temperatures up to 85°F 30°C, partly cloudy in the morning, becoming sunny through the afternoon and evening, with steady humidity and steady pressure.

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Weather by the Numbers

Wed, 9th
Round Knob IL Weather - Wednesday, Sep 9, 2026 - Sunny
Hi: 99°F 37°C
Lo: 73°F 23°C
Sunrise 06:32 AM
Sunset 07:12 PM
Wind SW 13 mph21 km/h
Dew Point 79°F26°C
uv Index 6
Barometric Pressure 30.06 in1018 mb
POP 3% *
Humidity 58%
Thu, 10th
Round Knob IL Weather - Thursday, Sep 10, 2026 - Patchy Rain Nearby
Hi: 95°F 35°C
Lo: 70°F 21°C
Sunrise 06:33 AM
Sunset 07:10 PM
Wind WSW 11 mph17 km/h
Dew Point 65°F18°C
uv Index 5
Barometric Pressure 29.97 in1015 mb
POP 17% *
Humidity 40%
Fri, 11th
Round Knob IL Weather - Friday, Sep 11, 2026 - Patchy Rain Nearby
Hi: 82°F 28°C
Lo: 69°F 20°C
Sunrise 06:34 AM
Sunset 07:09 PM
Wind NNE 4 mph7 km/h
Dew Point 68°F20°C
uv Index 3
Barometric Pressure 30 in1016 mb
POP 26% *
Humidity 88%
Sat, 12th
Round Knob IL Weather - Saturday, Sep 12, 2026 - Partly Cloudy
Hi: 91°F 33°C
Lo: 69°F 21°C
Sunrise 06:34 AM
Sunset 07:07 PM
Wind SW 7 mph11 km/h
Dew Point 70°F21°C
uv Index 6
Barometric Pressure 29.94 in1014 mb
POP 5% *
Humidity 62%
Sun, 13th
Round Knob IL Weather - Sunday, Sep 13, 2026 - Overcast
Hi: 94°F 34°C
Lo: 72°F 22°C
Sunrise 06:35 AM
Sunset 07:06 PM
Wind WSW 3 mph5 km/h
Dew Point 67°F20°C
uv Index 7
Barometric Pressure 30 in1016 mb
POP 11% *
Humidity 47%
Mon, 14th
Round Knob IL Weather - Monday, Sep 14, 2026 - Sunny
Hi: 99°F 37°C
Lo: 75°F 24°C
Sunrise 06:36 AM
Sunset 07:04 PM
Wind SW 10 mph15 km/h
Dew Point 65°F18°C
uv Index 8
Barometric Pressure 30 in1016 mb
POP 1% *
Humidity 38%
Tue, 15th
Round Knob IL Weather - Tuesday, Sep 15, 2026 - Sunny
Hi: 98°F 37°C
Lo: 75°F 24°C
Sunrise 06:37 AM
Sunset 07:02 PM
Wind WSW 9 mph14 km/h
Dew Point 66°F19°C
uv Index 8
Barometric Pressure 30.06 in1018 mb
POP 3% *
Humidity 41%
Wed, 16th
Round Knob IL Weather - Wednesday, Sep 16, 2026 - Patchy Rain Nearby
Hi: 88°F 31°C
Lo: 67°F 20°C
Sunrise 06:38 AM
Sunset 07:01 PM
Wind NE 6 mph9 km/h
Dew Point 67°F20°C
uv Index 6
Barometric Pressure 30.18 in1022 mb
POP 6% *
Humidity 64%
Thu, 17th
Round Knob IL Weather - Thursday, Sep 17, 2026 - Partly Cloudy
Hi: 90°F 32°C
Lo: 70°F 21°C
Sunrise 06:39 AM
Sunset 06:59 PM
Wind SSW 9 mph14 km/h
Dew Point 70°F21°C
uv Index 8
Barometric Pressure 30 in1016 mb
POP 11% *
Humidity 60%
Fri, 18th
Round Knob IL Weather - Friday, Sep 18, 2026 - Partly Cloudy
Hi: 73°F 23°C
Lo: 60°F 16°C
Sunrise 06:39 AM
Sunset 06:58 PM
Wind NW 12 mph20 km/h
Dew Point 54°F12°C
uv Index 6
Barometric Pressure 30.03 in1017 mb
POP 5% *
Humidity 57%
Sat, 19th
Round Knob IL Weather - Saturday, Sep 19, 2026 - Sunny
Hi: 76°F 24°C
Lo: 55°F 13°C
Sunrise 06:40 AM
Sunset 06:56 PM
Wind NE 7 mph12 km/h
Dew Point 49°F10°C
uv Index 6
Barometric Pressure 30.18 in1022 mb
POP 1% *
Humidity 47%
Sun, 20th
Round Knob IL Weather - Sunday, Sep 20, 2026 - Sunny
Hi: 78°F 25°C
Lo: 56°F 13°C
Sunrise 06:41 AM
Sunset 06:55 PM
Wind ENE 7 mph11 km/h
Dew Point 49°F10°C
uv Index 6
Barometric Pressure 30.12 in1020 mb
POP 1% *
Humidity 43%
Mon, 21st
Round Knob IL Weather - Monday, Sep 21, 2026 - Sunny
Hi: 83°F 28°C
Lo: 59°F 15°C
Sunrise 06:42 AM
Sunset 06:53 PM
Wind E 5 mph8 km/h
Dew Point 55°F13°C
uv Index 7
Barometric Pressure 30.03 in1017 mb
POP 1% *
Humidity 46%
Tue, 22nd
Round Knob IL Weather - Tuesday, Sep 22, 2026 - Sunny
Hi: 86°F 30°C
Lo: 67°F 19°C
Sunrise 06:43 AM
Sunset 06:52 PM
Wind SSE 6 mph10 km/h
Dew Point 56°F13°C
uv Index 7
Barometric Pressure 30.03 in1017 mb
POP 1% *
Humidity 44%
* POP = Probability of Precipitation. Data for 12:00 PM.