Jamestown, Illinois 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Mostly Clear 78°F 26°C Heat Index: 78°F	Observed at: Jamestown, IL	Elevation: 486 ft | 148 m
	Last Updated: July 16, 10:15 PM Timezone: GMT -5/-4
	Sky Conditions: Mostly Clear	Temperature: 78°F | 26°C
	Pressure: 29.56 in | 1000.9 mb	Dewpoint: 74°F | 23°C
	Humidity: 90%	Wind: SW 3 mph | SW 5 kph
	Feels Like: 87°F | 31°C	Visibility: 29.2 mi | 46.9 km
	Lat/Long: 38.0497 | -89.5292	Sunrise: 5:48 AM   Sunset: 8:19 PM

7 Day Graphical Forecast

Valid: 10:29 PM 7/16/2026

Tonight Foggy 72 °F 30% Chance Precipitation Friday Overcast 89 |73 °F 14% Chance Precipitation Saturday Overcast 91 |74 °F 35% Chance Precipitation Sunday Light Showers 92 |73 °F 35% Chance Precipitation Monday Drizzle 94 |71 °F 8% Chance Precipitation Tuesday Overcast 102 |70 °F 6% Chance Precipitation Wednesday Overcast 74 |62 °F 3% Chance Precipitation

7 Hour Graphical Forecast

Valid: 10:29 PM 7/16/2026

10 PM Partly Cloudy 78 °F 5% Chance Precipitation

11 PM Clear 77 °F 4% Chance Precipitation

12 AM Clear 76 °F 3% Chance Precipitation

1 AM Clear 75 °F 3% Chance Precipitation

2 AM Clear 75 °F 3% Chance Precipitation

3 AM Clear 74 °F 3% Chance Precipitation

4 AM Clear 74 °F 6% 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: 10:29 PM 7/16/2026 Tonight Foggy with a low around 72°F [22°C]. SW wind to around 6 mph [9 kph], with gusts to near 11 mph [17 kph]. Chance of precipitation 30% with QPF of 0.00 in [0.0 mm]. Friday Overcast with a high near 89°F [32°C]. W wind to around 8 mph [13 kph], with gusts to near 15 mph [24 kph]. Dewpoint near 74°F [23°C] with humidity of 95%. Pressure around 29.56 in [1000.9 mb]. UV Index: 7.75. Chance of precipitation 14% with QPF of 0.00 in [0.0 mm]. Friday Night Overcast with a low around 73°F [23°C]. W wind to around 8 mph [13 kph], with gusts to near 15 mph [24 kph]. Chance of precipitation 14% with QPF of 0.00 in [0.0 mm]. Saturday Overcast with a high near 91°F [33°C]. WSW wind to around 12 mph [20 kph], with gusts to near 21 mph [34 kph]. Dewpoint near 74°F [23°C] with humidity of 85%. Pressure around 29.56 in [1000.9 mb]. UV Index: 7.85. Chance of precipitation 35% with QPF of 0.00 in [0.0 mm]. Saturday Night Overcast with a low around 74°F [23°C]. WSW wind to around 12 mph [20 kph], with gusts to near 21 mph [34 kph]. Chance of precipitation 35% with QPF of 0.00 in [0.0 mm]. Sunday Light Showers with a high near 92°F [33°C]. NW wind to around 8 mph [13 kph], with gusts to near 13 mph [22 kph]. Dewpoint near 74°F [23°C] with humidity of 96%. Pressure around 29.56 in [1000.9 mb]. UV Index: 7.85. Chance of precipitation 35% with QPF of 0.21 in [5.2 mm]. Sunday Night Light Showers with a low around 73°F [23°C]. NW wind to around 8 mph [13 kph], with gusts to near 13 mph [22 kph]. Chance of precipitation 35% with QPF of 0.21 in [5.2 mm]. Monday Drizzle with a high near 94°F [35°C]. SSE wind to around 7 mph [12 kph], with gusts to near 21 mph [33 kph]. Dewpoint near 74°F [23°C] with humidity of 98%. Pressure around 29.56 in [1000.9 mb]. UV Index: 7.8. Chance of precipitation 8% with QPF of 0.04 in [1.1 mm]. Monday Night Drizzle with a low around 71°F [22°C]. SSE wind to around 7 mph [12 kph], with gusts to near 21 mph [33 kph]. Chance of precipitation 8% with QPF of 0.04 in [1.1 mm]. Tuesday Overcast with a high near 102°F [39°C]. WNW wind to around 17 mph [27 kph], with gusts to near 28 mph [46 kph]. Dewpoint near 74°F [23°C] with humidity of 84%. Pressure around 29.56 in [1000.9 mb]. UV Index: 7.9. Chance of precipitation 6% with QPF of 0.00 in [0.0 mm]. Tuesday Night Overcast with a low around 70°F [21°C]. WNW wind to around 17 mph [27 kph], with gusts to near 28 mph [46 kph]. Chance of precipitation 6% with QPF of 0.00 in [0.0 mm]. Wednesday Overcast with a high near 74°F [23°C]. N wind to around 11 mph [18 kph], with gusts to near 26 mph [42 kph]. Dewpoint near 74°F [23°C] with humidity of 88%. Pressure around 29.56 in [1000.9 mb]. UV Index: 7.15. Chance of precipitation 3% with QPF of 0.00 in [0.0 mm]. Wednesday Night Overcast with a low around 62°F [16°C]. N wind to around 11 mph [18 kph], with gusts to near 26 mph [42 kph]. Chance of precipitation 3% with QPF of 0.00 in [0.0 mm].

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7 Day and Night - QPF Forecast for Jamestown, IL

Tonight: 0.0 mm | 0.00 in

Friday: 0.0 mm | 0.00 in

Friday Night: 0.0 mm | 0.00 in

Saturday: 0.0 mm | 0.00 in

Saturday Night: 0.0 mm | 0.00 in

Sunday: 5.2 mm | 0.21 in

Sunday Night: 5.2 mm | 0.21 in

Monday: 1.1 mm | 0.04 in

Monday Night: 1.1 mm | 0.04 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

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

Tonight: SW @ 9 kph | 6 mph

Friday: W @ 13 kph | 8 mph

Friday Night: W @ 13 kph | 8 mph

Saturday: WSW @ 20 kph | 12 mph

Saturday Night: WSW @ 20 kph | 12 mph

Sunday: NW @ 13 kph | 8 mph

Sunday Night: NW @ 13 kph | 8 mph

Monday: SSE @ 12 kph | 7 mph

Monday Night: SSE @ 12 kph | 7 mph

Tuesday: WNW @ 27 kph | 17 mph

Tuesday Night: WNW @ 27 kph | 17 mph

Wednesday: N @ 18 kph | 11 mph

Wednesday Night: N @ 18 kph | 11 mph

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

Tonight: 96 %

Friday: 95 %

Friday Night: 95 %

Saturday: 85 %

Saturday Night: 85 %

Sunday: 96 %

Sunday Night: 96 %

Monday: 98 %

Monday Night: 98 %

Tuesday: 84 %

Tuesday Night: 84 %

Wednesday: 88 %

Wednesday Night: 88 %

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

Tonight: 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

Sunday: 0.0 cm | 0.00 in

Sunday Night: 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

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