Jamestown, Illinois 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Overcast 83°F 28°C Heat Index: 92°F	Observed at: Jamestown, IL	Elevation: 486 ft | 148 m
	Last Updated: July 26, 11:45 PM Timezone: GMT -5/-4
	Sky Conditions: Overcast	Temperature: 83°F | 28°C
	Pressure: 29.39 in | 995.2 mb	Dewpoint: 77°F | 25°C
	Humidity: 82%	Wind: E 1 mph | E 2 kph
	Feels Like: 94°F | 34°C	Visibility: 34 mi | 54.8 km
	Lat/Long: 38.0497 | -89.5292	Sunrise: 5:56 AM   Sunset: 8:12 PM

7 Day Graphical Forecast

Valid: 5:52 PM 7/29/2026

Tonight Drizzle 75 °F 15% Chance Precipitation Monday Heavy Rain 98 |75 °F 17% Chance Precipitation Tuesday Overcast 90 |75 °F 4% Chance Precipitation Wednesday Overcast 86 |69 °F 4% Chance Precipitation Thursday Overcast 89 |64 °F 2% Chance Precipitation Friday Heavy Showers 76 |66 °F 42% Chance Precipitation Saturday Light Drizzle 77 |64 °F 42% Chance Precipitation

7 Hour Graphical Forecast

Valid: 5:52 PM 7/29/2026

5 PM Clear 85 °F 2% Chance Precipitation

6 PM Clear 83 °F 2% Chance Precipitation

7 PM Clear 80 °F 2% Chance Precipitation

8 PM Clear 75 °F 2% Chance Precipitation

9 PM Clear 73 °F 2% Chance Precipitation

10 PM Clear 72 °F 2% Chance Precipitation

11 PM Clear 71 °F 2% Chance Precipitation

7 Day Textual Forecast - with QPF, Max Wind, Humidity, Snowfall & UV Index

7 Day & Night Weather Forecast for Jamestown, IL - (Fahrenheit & Celsius) Valid: 5:52 PM 7/29/2026 Tonight Drizzle with a low around 75°F [24°C]. SW wind to around 12 mph [19 kph], with gusts to near 23 mph [36 kph]. Chance of precipitation 15% with QPF of 0.03 in [0.7 mm]. Monday Heavy Rain with a high near 98°F [37°C]. SW wind to around 27 mph [43 kph], with gusts to near 41 mph [65 kph]. Dewpoint near 77°F [25°C] with humidity of 94%. Pressure around 29.39 in [995.2 mb]. UV Index: 7.8. Chance of precipitation 17% with QPF of 4.39 in [111.6 mm]. Monday Night Heavy Rain with a low around 75°F [24°C]. SW wind to around 27 mph [43 kph], with gusts to near 41 mph [65 kph]. Chance of precipitation 17% with QPF of 4.39 in [111.6 mm]. Tuesday Overcast with a high near 90°F [32°C]. NNW wind to around 11 mph [18 kph], with gusts to near 20 mph [32 kph]. Dewpoint near 77°F [25°C] with humidity of 88%. Pressure around 29.39 in [995.2 mb]. UV Index: 7. Chance of precipitation 4% with QPF of 0.00 in [0.0 mm]. Tuesday Night Overcast with a low around 75°F [24°C]. NNW wind to around 11 mph [18 kph], with gusts to near 20 mph [32 kph]. Chance of precipitation 4% with QPF of 0.00 in [0.0 mm]. Wednesday Overcast with a high near 86°F [30°C]. ENE wind to around 7 mph [12 kph], with gusts to near 17 mph [28 kph]. Dewpoint near 77°F [25°C] with humidity of 92%. Pressure around 29.39 in [995.2 mb]. UV Index: 7.75. Chance of precipitation 4% with QPF of 0.00 in [0.0 mm]. Wednesday Night Overcast with a low around 69°F [20°C]. ENE wind to around 7 mph [12 kph], with gusts to near 17 mph [28 kph]. Chance of precipitation 4% with QPF of 0.00 in [0.0 mm]. Thursday Overcast with a high near 89°F [32°C]. SSE wind to around 8 mph [13 kph], with gusts to near 21 mph [33 kph]. Dewpoint near 77°F [25°C] with humidity of 89%. Pressure around 29.39 in [995.2 mb]. UV Index: 7.1. Chance of precipitation 2% with QPF of 0.00 in [0.0 mm]. Thursday Night Overcast with a low around 64°F [18°C]. SSE wind to around 8 mph [13 kph], with gusts to near 21 mph [33 kph]. Chance of precipitation 2% with QPF of 0.00 in [0.0 mm]. Friday Heavy Showers with a high near 76°F [25°C]. SE wind to around 18 mph [30 kph], with gusts to near 40 mph [64 kph]. Dewpoint near 77°F [25°C] with humidity of 98%. Pressure around 29.39 in [995.2 mb]. UV Index: 1.65. Chance of precipitation 42% with QPF of 1.45 in [36.7 mm]. Friday Night Heavy Showers with a low around 66°F [19°C]. SE wind to around 18 mph [30 kph], with gusts to near 40 mph [64 kph]. Chance of precipitation 42% with QPF of 1.45 in [36.7 mm]. Saturday Light Drizzle with a high near 77°F [25°C]. NE wind to around 15 mph [24 kph], with gusts to near 26 mph [41 kph]. Dewpoint near 77°F [25°C] with humidity of 98%. Pressure around 29.39 in [995.2 mb]. UV Index: 4.7. Chance of precipitation 42% with QPF of 0.02 in [0.5 mm]. Saturday Night Light Drizzle with a low around 64°F [18°C]. NE wind to around 15 mph [24 kph], with gusts to near 26 mph [41 kph]. Chance of precipitation 42% with QPF of 0.02 in [0.5 mm].

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7 Day and Night - QPF Forecast for Jamestown, IL

Tonight: 0.7 mm | 0.03 in

Monday: 111.6 mm | 4.39 in

Monday Night: 111.6 mm | 4.39 in

Tuesday: 0.0 mm | 0.00 in

Tuesday Night: 0.0 mm | 0.00 in

Wednesday: 0.0 mm | 0.00 in

Wednesday Night: 0.0 mm | 0.00 in

Thursday: 0.0 mm | 0.00 in

Thursday Night: 0.0 mm | 0.00 in

Friday: 36.7 mm | 1.45 in

Friday Night: 36.7 mm | 1.45 in

Saturday: 0.5 mm | 0.02 in

Saturday Night: 0.5 mm | 0.02 in

7 Day and Night - Maximum Wind Speed Forecast for Jamestown, IL

Tonight: SW @ 19 kph | 12 mph

Monday: SW @ 43 kph | 27 mph

Monday Night: SW @ 43 kph | 27 mph

Tuesday: NNW @ 18 kph | 11 mph

Tuesday Night: NNW @ 18 kph | 11 mph

Wednesday: ENE @ 12 kph | 7 mph

Wednesday Night: ENE @ 12 kph | 7 mph

Thursday: SSE @ 13 kph | 8 mph

Thursday Night: SSE @ 13 kph | 8 mph

Friday: SE @ 30 kph | 18 mph

Friday Night: SE @ 30 kph | 18 mph

Saturday: NE @ 24 kph | 15 mph

Saturday Night: NE @ 24 kph | 15 mph

7 Day and Night - Maximum Humidity Forecast for Jamestown, IL

Tonight: 96 %

Monday: 94 %

Monday Night: 94 %

Tuesday: 88 %

Tuesday Night: 88 %

Wednesday: 92 %

Wednesday Night: 92 %

Thursday: 89 %

Thursday Night: 89 %

Friday: 98 %

Friday Night: 98 %

Saturday: 98 %

Saturday Night: 98 %

7 Day and Night - Snowfall Totals Forecast for Jamestown, IL

Tonight: 0.0 cm | 0.00 in

Monday: 0.0 cm | 0.00 in

Monday Night: 0.0 cm | 0.00 in

Tuesday: 0.0 cm | 0.00 in

Tuesday Night: 0.0 cm | 0.00 in

Wednesday: 0.0 cm | 0.00 in

Wednesday Night: 0.0 cm | 0.00 in

Thursday: 0.0 cm | 0.00 in

Thursday Night: 0.0 cm | 0.00 in

Friday: 0.0 cm | 0.00 in

Friday Night: 0.0 cm | 0.00 in

Saturday: 0.0 cm | 0.00 in

Saturday Night: 0.0 cm | 0.00 in

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