Newcastle, IL 14 Day Weather - WeatherWorld.com
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Newcastle, IL Weather Forecast


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
67°F 20°C
Sunny
Mid-Afternoon
85°F 30°C
Sunny
Early-Evening
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
80°F 27°C
Sunny
Mid-Afternoon
97°F 36°C
Partly Cloudy
Early-Evening
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
80°F 27°C
Partly Cloudy
Mid-Afternoon
95°F 35°C
Sunny
Early-Evening
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
83°F 28°C
Sunny
Mid-Afternoon
100°F 38°C
Partly Cloudy
Early-Evening
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
83°F 28°C
Sunny
Mid-Afternoon
98°F 37°C
Partly Cloudy
Early-Evening
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
79°F 26°C
Sunny
Mid-Afternoon
96°F 35°C
Sunny
Early-Evening
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
78°F 26°C
Sunny
Mid-Afternoon
95°F 35°C
Sunny
Early-Evening
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
79°F 26°C
Sunny
Mid-Afternoon
90°F 32°C
Scattered Showers
Early-Evening
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
76°F 24°C
Overcast
Mid-Afternoon
85°F 30°C
Overcast
Early-Evening
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
73°F 23°C
Fog
Mid-Afternoon
86°F 30°C
Sunny
Early-Evening
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
71°F 22°C
Light Fog
Mid-Afternoon
83°F 28°C
Overcast
Early-Evening
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
71°F 22°C
Overcast
Mid-Afternoon
83°F 29°C
Overcast
Early-Evening
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
71°F 21°C
Sunny
Mid-Afternoon
85°F 30°C
Partly Cloudy
Early-Evening
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
67°F 20°C
Overcast
Mid-Afternoon
76°F 24°C
Overcast
Early-Evening
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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