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Newcastle IL Weather - Clear - 88°F
Clear
88°F
Updated 5:15 pm
Feels Like 84°F
Humidity 38%
Wind E 3 mph
Barometer  30.09 in
Dew Point 60°F
Newcastle IL Weather - Clear - 31°C
Clear
31°C
Updated 5:15 pm
Feels Like 29°C
Humidity 38%
Wind E 5 km/h
Barometer  101.8 kPa
Dew Point 15°C
Newcastle, IL Weather and Current Conditionsnewcastle il weather forecast

Newcastle, IL Weather Forecast

Newcastle Illinois WeatherNewcastle, Illinois Weather Weather Forecast
14 day API Newcastle, IL weather forecast. Note. Our 7-day weather forecast for Newcastle, Illinois is our most reliable and accurate forecast. This model should only be used as a likely scenario. Forecasting more than 7 days is difficult.
Newcastle, IL Weather Forecast Dated: 515 PM Mon Sep 14 2026
Expect a hot stretch with a mix of sun and clouds and occasional showers over the coming period. moderate humidity and no major pressure swings will dominate.

Monday, September 14, 2026

Mid-Morning
Newcastle Weather - 2026-09-14 - Morning - Sunny
67°F 20°C
Sunny
Mid-Afternoon
Newcastle Weather - 2026-09-14 - Afternoon - Sunny
85°F 30°C
Sunny
Early-Evening
Newcastle Weather - 2026-09-14 - Evening - Sunny
79°F 26°C
Sunny
Warm and summery near 85°F 30°C, sunny throughout the day, with steady humidity and barometric pressure falling. Winds turning from the ENE to the ESE at 7 mph 12 km/h.

Tuesday, September 15, 2026

Mid-Morning
Newcastle Weather - 2026-09-15 - Morning - Sunny
80°F 27°C
Sunny
Mid-Afternoon
Newcastle Weather - 2026-09-15 - Afternoon - Partly Cloudy
97°F 36°C
Partly Cloudy
Early-Evening
Newcastle Weather - 2026-09-15 - Evening - Partly Cloudy
88°F 31°C
Partly Cloudy
Hot and sweltering around 97°F 36°C (heat index 100°F 38°C), sunny in the morning, becoming cloudy through the afternoon and evening, with steady humidity and steady pressure. Winds blowing from the SSW at 10 mph 15 km/h.

Wednesday, September 16, 2026

Mid-Morning
Newcastle Weather - 2026-09-16 - Morning - Partly Cloudy
80°F 27°C
Partly Cloudy
Mid-Afternoon
Newcastle Weather - 2026-09-16 - Afternoon - Sunny
95°F 35°C
Sunny
Early-Evening
Newcastle Weather - 2026-09-16 - Evening - Scattered Showers
87°F 31°C
Scattered Showers
Sizzling hot with 95°F 35°C, locally heavy downpours at times, with steady humidity and steady pressure. Winds moving from the SSW to the E at 4 mph 7 km/h.

Thursday, September 17, 2026

Mid-Morning
Newcastle Weather - 2026-09-17 - Morning - Sunny
83°F 28°C
Sunny
Mid-Afternoon
Newcastle Weather - 2026-09-17 - Afternoon - Partly Cloudy
100°F 38°C
Partly Cloudy
Early-Evening
Newcastle Weather - 2026-09-17 - Evening - Cloudy
90°F 32°C
Cloudy
Dangerously hot with a high of 100°F 38°C, sunny in the morning, cloudy in the afternoon, and overcast this evening, with steady humidity and steady pressure.

Friday, September 18, 2026

Mid-Morning
Newcastle Weather - 2026-09-18 - Morning - Sunny
83°F 28°C
Sunny
Mid-Afternoon
Newcastle Weather - 2026-09-18 - Afternoon - Partly Cloudy
98°F 37°C
Partly Cloudy
Early-Evening
Newcastle Weather - 2026-09-18 - Evening - Scattered Showers
88°F 31°C
Scattered Showers
Very hot with a high of 98°F 37°C, scattered downpours possible, with steady humidity and barometric pressure falling.

Saturday, September 19, 2026

Mid-Morning
Newcastle Weather - 2026-09-19 - Morning - Sunny
79°F 26°C
Sunny
Mid-Afternoon
Newcastle Weather - 2026-09-19 - Afternoon - Sunny
96°F 35°C
Sunny
Early-Evening
Newcastle Weather - 2026-09-19 - Evening - Sunny
88°F 31°C
Sunny
Very hot with temperatures reaching 96°F 35°C, cloudy in the morning, sunny in the afternoon, and partly cloudy this evening, with lower humidity and barometric pressure falling. Winds out of the SSW at 9 mph 14 km/h.

Sunday, September 20, 2026

Mid-Morning
Newcastle Weather - 2026-09-20 - Morning - Sunny
78°F 26°C
Sunny
Mid-Afternoon
Newcastle Weather - 2026-09-20 - Afternoon - Sunny
95°F 35°C
Sunny
Early-Evening
Newcastle Weather - 2026-09-20 - Evening - Sunny
86°F 30°C
Sunny
Hot and sweltering around 95°F 35°C, cloudy in the morning, sunny in the afternoon, and partly cloudy this evening, with lower humidity and steady pressure. Winds shifting from the SW to the ESE at 5 mph 7 km/h.

Monday, September 21, 2026

Mid-Morning
Newcastle Weather - 2026-09-21 - Morning - Sunny
79°F 26°C
Sunny
Mid-Afternoon
Newcastle Weather - 2026-09-21 - Afternoon - Scattered Showers
90°F 32°C
Scattered Showers
Early-Evening
Newcastle Weather - 2026-09-21 - Evening - Light Showers
78°F 26°C
Light Showers
Sizzling hot with 90°F 32°C, scattered downpours possible, with increasing humidity and steady pressure.

Tuesday, September 22, 2026

Mid-Morning
Newcastle Weather - 2026-09-22 - Morning - Overcast
76°F 24°C
Overcast
Mid-Afternoon
Newcastle Weather - 2026-09-22 - Afternoon - Overcast
85°F 30°C
Overcast
Early-Evening
Newcastle Weather - 2026-09-22 - Evening - Light Showers
79°F 26°C
Light Showers
Very warm near 85°F 30°C, though humidity makes it feel like 90°F 32°C, dry most of the day, with showers developing late, with steady humidity and steady pressure.

Wednesday, September 23, 2026

Mid-Morning
Newcastle Weather - 2026-09-23 - Morning - Fog
73°F 23°C
Fog
Mid-Afternoon
Newcastle Weather - 2026-09-23 - Afternoon - Sunny
86°F 30°C
Sunny
Early-Evening
Newcastle Weather - 2026-09-23 - Evening - Sunny
77°F 25°C
Sunny
Very warm with a high of 86°F 30°C, partly cloudy in the morning, becoming sunny through the afternoon and evening, with lower humidity and steady pressure.

Thursday, September 24, 2026

Mid-Morning
Newcastle Weather - 2026-09-24 - Morning - Light Fog
71°F 22°C
Light Fog
Mid-Afternoon
Newcastle Weather - 2026-09-24 - Afternoon - Overcast
83°F 28°C
Overcast
Early-Evening
Newcastle Weather - 2026-09-24 - Evening - Partly Cloudy
77°F 25°C
Partly Cloudy
Warm and summery near 83°F 28°C, overcast in the morning, becoming cloudy through the afternoon and evening, with lower humidity and steady pressure. Winds turning from the NNE to the NE at 6 mph 9 km/h.

Friday, September 25, 2026

Mid-Morning
Newcastle Weather - 2026-09-25 - Morning - Overcast
71°F 22°C
Overcast
Mid-Afternoon
Newcastle Weather - 2026-09-25 - Afternoon - Overcast
83°F 29°C
Overcast
Early-Evening
Newcastle Weather - 2026-09-25 - Evening - Overcast
76°F 25°C
Overcast
Balmy with temperatures reaching 83°F 29°C, overcast through the afternoon, turning partly cloudy this evening, with lower humidity and steady pressure.

Saturday, September 26, 2026

Mid-Morning
Newcastle Weather - 2026-09-26 - Morning - Sunny
71°F 21°C
Sunny
Mid-Afternoon
Newcastle Weather - 2026-09-26 - Afternoon - Partly Cloudy
85°F 30°C
Partly Cloudy
Early-Evening
Newcastle Weather - 2026-09-26 - Evening - Overcast
77°F 25°C
Overcast
Quite warm around 85°F 30°C, partly cloudy in the morning, cloudy in the afternoon, and partly cloudy this evening, with steady humidity and barometric pressure falling.

Sunday, September 27, 2026

Mid-Morning
Newcastle Weather - 2026-09-27 - Morning - Overcast
67°F 20°C
Overcast
Mid-Afternoon
Newcastle Weather - 2026-09-27 - Afternoon - Overcast
76°F 24°C
Overcast
Early-Evening
Newcastle Weather - 2026-09-27 - Evening - Sunny
74°F 24°C
Sunny
Mild temperatures up to 76°F 24°C, overcast in the morning, partly cloudy in the afternoon, and overcast this evening, with steady humidity and steady pressure.

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Weather by the Numbers

Mon, 14th
Newcastle IL Weather - Monday, Sep 14, 2026 - Sunny
Hi: 85°F 30°C
Lo: 63°F 17°C
Sunrise 06:35 AM
Sunset 07:04 PM
Wind E 9 mph15 km/h
Dew Point 53°F12°C
uv Index 7
Barometric Pressure 30.15 in1021 mb
POP 1% *
Humidity 41%
Tue, 15th
Newcastle IL Weather - Tuesday, Sep 15, 2026 - Overcast
Hi: 97°F 36°C
Lo: 72°F 22°C
Sunrise 06:36 AM
Sunset 07:02 PM
Wind SW 11 mph17 km/h
Dew Point 66°F19°C
uv Index 7
Barometric Pressure 30.09 in1019 mb
POP 10% *
Humidity 42%
Wed, 16th
Newcastle IL Weather - Wednesday, Sep 16, 2026 - Overcast
Hi: 95°F 35°C
Lo: 74°F 23°C
Sunrise 06:37 AM
Sunset 07:00 PM
Wind SW 3 mph5 km/h
Dew Point 64°F18°C
uv Index 7
Barometric Pressure 30.24 in1024 mb
POP 11% *
Humidity 49%
Thu, 17th
Newcastle IL Weather - Thursday, Sep 17, 2026 - Sunny
Hi: 100°F 38°C
Lo: 78°F 25°C
Sunrise 06:38 AM
Sunset 06:59 PM
Wind WSW 6 mph10 km/h
Dew Point 58°F15°C
uv Index 9
Barometric Pressure 30.18 in1022 mb
POP 1% *
Humidity 28%
Fri, 18th
Newcastle IL Weather - Friday, Sep 18, 2026 - Sunny
Hi: 99°F 37°C
Lo: 77°F 25°C
Sunrise 06:39 AM
Sunset 06:57 PM
Wind SE 3 mph5 km/h
Dew Point 62°F17°C
uv Index 9
Barometric Pressure 30.09 in1019 mb
POP 1% *
Humidity 33%
Sat, 19th
Newcastle IL Weather - Saturday, Sep 19, 2026 - Patchy Rain Nearby
Hi: 96°F 36°C
Lo: 69°F 20°C
Sunrise 06:40 AM
Sunset 06:56 PM
Wind SW 8 mph13 km/h
Dew Point 64°F18°C
uv Index 7
Barometric Pressure 29.94 in1014 mb
POP 2% *
Humidity 42%
Sun, 20th
Newcastle IL Weather - Sunday, Sep 20, 2026 - Patchy Rain Nearby
Hi: 96°F 35°C
Lo: 72°F 22°C
Sunrise 06:40 AM
Sunset 06:54 PM
Wind SW 7 mph12 km/h
Dew Point 56°F14°C
uv Index 7
Barometric Pressure 29.88 in1012 mb
POP 2% *
Humidity 33%
Mon, 21st
Newcastle IL Weather - Monday, Sep 21, 2026 - Patchy Rain Nearby
Hi: 91°F 33°C
Lo: 72°F 22°C
Sunrise 06:41 AM
Sunset 06:53 PM
Wind SW 6 mph9 km/h
Dew Point 64°F18°C
uv Index 6
Barometric Pressure 29.91 in1013 mb
POP 10% *
Humidity 48%
Tue, 22nd
Newcastle IL Weather - Tuesday, Sep 22, 2026 - Overcast
Hi: 88°F 31°C
Lo: 72°F 22°C
Sunrise 06:42 AM
Sunset 06:51 PM
Wind W 1 mph2 km/h
Dew Point 67°F19°C
uv Index 6
Barometric Pressure 30.03 in1017 mb
POP 13% *
Humidity 56%
Wed, 23rd
Newcastle IL Weather - Wednesday, Sep 23, 2026 - Sunny
Hi: 86°F 30°C
Lo: 68°F 20°C
Sunrise 06:43 AM
Sunset 06:49 PM
Wind NNE 7 mph11 km/h
Dew Point 60°F15°C
uv Index 7
Barometric Pressure 30.12 in1020 mb
POP 2% *
Humidity 49%
Thu, 24th
Newcastle IL Weather - Thursday, Sep 24, 2026 - Overcast
Hi: 83°F 29°C
Lo: 65°F 19°C
Sunrise 06:44 AM
Sunset 06:48 PM
Wind NE 7 mph12 km/h
Dew Point 59°F15°C
uv Index 6
Barometric Pressure 30.15 in1021 mb
POP 12% *
Humidity 51%
Fri, 25th
Newcastle IL Weather - Friday, Sep 25, 2026 - Cloudy
Hi: 84°F 29°C
Lo: 65°F 18°C
Sunrise 06:45 AM
Sunset 06:46 PM
Wind ENE 6 mph10 km/h
Dew Point 60°F15°C
uv Index 6
Barometric Pressure 30.12 in1020 mb
POP 11% *
Humidity 50%
Sat, 26th
Newcastle IL Weather - Saturday, Sep 26, 2026 - Partly Cloudy
Hi: 86°F 30°C
Lo: 63°F 17°C
Sunrise 06:46 AM
Sunset 06:45 PM
Wind E 5 mph8 km/h
Dew Point 55°F13°C
uv Index 7
Barometric Pressure 30.06 in1018 mb
POP 3% *
Humidity 39%
Sun, 27th
Newcastle IL Weather - Sunday, Sep 27, 2026 - Overcast
Hi: 78°F 26°C
Lo: 64°F 18°C
Sunrise 06:46 AM
Sunset 06:43 PM
Wind ENE 4 mph6 km/h
Dew Point 48°F9°C
uv Index 5
Barometric Pressure 30.03 in1017 mb
POP 11% *
Humidity 46%
* POP = Probability of Precipitation. Data for 12:00 PM.