Harrisburg, Illinois 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Clear 66°F 19°C	Observed at: Harrisburg, IL	Elevation: 397 ft | 121 m
	Last Updated: July 29, 5:15 AM Timezone: GMT -5/-4
	Sky Conditions: Clear	Temperature: 66°F | 19°C
	Pressure: 29.46 in | 997.6 mb	Dewpoint: 64°F | 18°C
	Humidity: 92%	Wind: NNW 4 mph | NNW 6 kph
	Feels Like: 69°F | 21°C	Visibility: 25.1 mi | 40.4 km
	Lat/Long: 37.7383 | -88.5406	Sunrise: 5:55 AM   Sunset: 8:05 PM

7 Day Graphical Forecast

Valid: 5:29 AM 7/29/2026

Tonight Clear 65 °F 1% Chance Precipitation Thursday Overcast 85 |64 °F 0% Chance Precipitation Friday Light Showers 85 |65 °F 70% Chance Precipitation Saturday Light Showers 75 |67 °F 70% Chance Precipitation Sunday Overcast 81 |62 °F 38% Chance Precipitation Monday Clear 83 |63 °F 28% Chance Precipitation Tuesday Light Drizzle 87 |63 °F 22% Chance Precipitation

7 Hour Graphical Forecast

Valid: 5:29 AM 7/29/2026

5 AM Clear 66 °F 0% Chance Precipitation

6 AM Clear 65 °F 0% Chance Precipitation

7 AM Clear 66 °F 1% Chance Precipitation

8 AM Clear 68 °F 1% Chance Precipitation

9 AM Clear 71 °F 1% Chance Precipitation

10 AM Clear 74 °F 1% Chance Precipitation

11 AM Clear 77 °F 1% Chance Precipitation

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

7 Day & Night Weather Forecast for Harrisburg, IL - (Fahrenheit & Celsius) Valid: 5:29 AM 7/29/2026 Tonight Clear with a low around 65°F [19°C]. N wind to around 8 mph [13 kph], with gusts to near 19 mph [31 kph]. Chance of precipitation 1% with QPF of 0.00 in [0.0 mm]. Thursday Overcast with a high near 85°F [30°C]. E wind to around 6 mph [10 kph], with gusts to near 12 mph [19 kph]. Dewpoint near 64°F [18°C] with humidity of 86%. Pressure around 29.46 in [997.6 mb]. UV Index: 7.5. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Thursday Night Overcast with a low around 64°F [18°C]. E wind to around 6 mph [10 kph], with gusts to near 12 mph [19 kph]. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Friday Light Showers with a high near 85°F [29°C]. SSE wind to around 11 mph [17 kph], with gusts to near 26 mph [42 kph]. Dewpoint near 64°F [18°C] with humidity of 93%. Pressure around 29.46 in [997.6 mb]. UV Index: 6.35. Chance of precipitation 70% with QPF of 0.19 in [4.8 mm]. Friday Night Light Showers with a low around 65°F [18°C]. SSE wind to around 11 mph [17 kph], with gusts to near 26 mph [42 kph]. Chance of precipitation 70% with QPF of 0.19 in [4.8 mm]. Saturday Light Showers with a high near 75°F [24°C]. NNE wind to around 14 mph [23 kph], with gusts to near 29 mph [47 kph]. Dewpoint near 64°F [18°C] with humidity of 98%. Pressure around 29.46 in [997.6 mb]. UV Index: 1.4. Chance of precipitation 70% with QPF of 0.26 in [6.5 mm]. Saturday Night Light Showers with a low around 67°F [19°C]. NNE wind to around 14 mph [23 kph], with gusts to near 29 mph [47 kph]. Chance of precipitation 70% with QPF of 0.26 in [6.5 mm]. Sunday Overcast with a high near 81°F [27°C]. NNE wind to around 14 mph [22 kph], with gusts to near 27 mph [44 kph]. Dewpoint near 64°F [18°C] with humidity of 97%. Pressure around 29.46 in [997.6 mb]. UV Index: 7.45. Chance of precipitation 38% with QPF of 0.00 in [0.0 mm]. Sunday Night Overcast with a low around 62°F [17°C]. NNE wind to around 14 mph [22 kph], with gusts to near 27 mph [44 kph]. Chance of precipitation 38% with QPF of 0.00 in [0.0 mm]. Monday Clear with a high near 83°F [28°C]. NE wind to around 11 mph [17 kph], with gusts to near 15 mph [24 kph]. Dewpoint near 64°F [18°C] with humidity of 95%. Pressure around 29.46 in [997.6 mb]. UV Index: 7.5. Chance of precipitation 28% with QPF of 0.00 in [0.0 mm]. Monday Night Clear with a low around 63°F [17°C]. NE wind to around 11 mph [17 kph], with gusts to near 15 mph [24 kph]. Chance of precipitation 28% with QPF of 0.00 in [0.0 mm]. Tuesday Light Drizzle with a high near 87°F [31°C]. ENE wind to around 8 mph [13 kph], with gusts to near 13 mph [21 kph]. Dewpoint near 64°F [18°C] with humidity of 89%. Pressure around 29.46 in [997.6 mb]. UV Index: 7.45. Chance of precipitation 22% with QPF of 0.01 in [0.3 mm]. Tuesday Night Light Drizzle with a low around 63°F [17°C]. ENE wind to around 8 mph [13 kph], with gusts to near 13 mph [21 kph]. Chance of precipitation 22% with QPF of 0.01 in [0.3 mm].

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7 Day and Night - QPF Forecast for Harrisburg, IL

Tonight: 0.0 mm | 0.00 in

Thursday: 0.0 mm | 0.00 in

Thursday Night: 0.0 mm | 0.00 in

Friday: 4.8 mm | 0.19 in

Friday Night: 4.8 mm | 0.19 in

Saturday: 6.5 mm | 0.26 in

Saturday Night: 6.5 mm | 0.26 in

Sunday: 0.0 mm | 0.00 in

Sunday Night: 0.0 mm | 0.00 in

Monday: 0.0 mm | 0.00 in

Monday Night: 0.0 mm | 0.00 in

Tuesday: 0.3 mm | 0.01 in

Tuesday Night: 0.3 mm | 0.01 in

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

Tonight: N @ 13 kph | 8 mph

Thursday: E @ 10 kph | 6 mph

Thursday Night: E @ 10 kph | 6 mph

Friday: SSE @ 17 kph | 11 mph

Friday Night: SSE @ 17 kph | 11 mph

Saturday: NNE @ 23 kph | 14 mph

Saturday Night: NNE @ 23 kph | 14 mph

Sunday: NNE @ 22 kph | 14 mph

Sunday Night: NNE @ 22 kph | 14 mph

Monday: NE @ 17 kph | 11 mph

Monday Night: NE @ 17 kph | 11 mph

Tuesday: ENE @ 13 kph | 8 mph

Tuesday Night: ENE @ 13 kph | 8 mph

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

Tonight: 93 %

Thursday: 86 %

Thursday Night: 86 %

Friday: 93 %

Friday Night: 93 %

Saturday: 98 %

Saturday Night: 98 %

Sunday: 97 %

Sunday Night: 97 %

Monday: 95 %

Monday Night: 95 %

Tuesday: 89 %

Tuesday Night: 89 %

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

Tonight: 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

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

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