Alton, Illinois 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Clear 69°F 21°C	Observed at: Alton, IL	Elevation: 449 ft | 137 m
	Last Updated: July 29, 5:15 AM Timezone: GMT -5/-4
	Sky Conditions: Clear	Temperature: 69°F | 21°C
	Pressure: 29.4 in | 995.7 mb	Dewpoint: 61°F | 16°C
	Humidity: 76%	Wind: NE 5 mph | NE 8 kph
	Feels Like: 70°F | 21°C	Visibility: 41.4 mi | 66.6 km
	Lat/Long: 38.8906 | -90.1842	Sunrise: 5:59 AM   Sunset: 8:14 PM

7 Day Graphical Forecast

Valid: 5:22 AM 7/29/2026

Tonight Clear 67 °F 1% Chance Precipitation Thursday Overcast 89 |66 °F 0% Chance Precipitation Friday Light Showers 83 |69 °F 71% Chance Precipitation Saturday Light Showers 78 |67 °F 71% Chance Precipitation Sunday Light Drizzle 82 |61 °F 21% Chance Precipitation Monday Clear 83 |64 °F 18% Chance Precipitation Tuesday Clear 86 |63 °F 8% Chance Precipitation

7 Hour Graphical Forecast

Valid: 5:22 AM 7/29/2026

5 AM Clear 69 °F 0% Chance Precipitation

6 AM Clear 67 °F 1% Chance Precipitation

7 AM Clear 68 °F 1% Chance Precipitation

8 AM Clear 70 °F 1% Chance Precipitation

9 AM Clear 74 °F 1% Chance Precipitation

10 AM Clear 77 °F 1% Chance Precipitation

11 AM Clear 79 °F 0% Chance Precipitation

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

7 Day & Night Weather Forecast for Alton, IL - (Fahrenheit & Celsius) Valid: 5:22 AM 7/29/2026 Tonight Clear with a low around 67°F [20°C]. NE wind to around 8 mph [12 kph], with gusts to near 13 mph [21 kph]. Chance of precipitation 1% with QPF of 0.00 in [0.0 mm]. Thursday Overcast with a high near 89°F [32°C]. E wind to around 7 mph [11 kph], with gusts to near 15 mph [25 kph]. Dewpoint near 61°F [16°C] with humidity of 71%. Pressure around 29.40 in [995.7 mb]. UV Index: 7.1. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Thursday Night Overcast with a low around 66°F [19°C]. E wind to around 7 mph [11 kph], with gusts to near 15 mph [25 kph]. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Friday Light Showers with a high near 83°F [28°C]. SSE wind to around 17 mph [27 kph], with gusts to near 31 mph [50 kph]. Dewpoint near 61°F [16°C] with humidity of 93%. Pressure around 29.40 in [995.7 mb]. UV Index: 6.55. Chance of precipitation 71% with QPF of 0.21 in [5.3 mm]. Friday Night Light Showers with a low around 69°F [21°C]. SSE wind to around 17 mph [27 kph], with gusts to near 31 mph [50 kph]. Chance of precipitation 71% with QPF of 0.21 in [5.3 mm]. Saturday Light Showers with a high near 78°F [25°C]. NNE wind to around 17 mph [27 kph], with gusts to near 26 mph [42 kph]. Dewpoint near 61°F [16°C] with humidity of 98%. Pressure around 29.40 in [995.7 mb]. UV Index: 6.6. Chance of precipitation 71% with QPF of 0.30 in [7.6 mm]. Saturday Night Light Showers with a low around 67°F [20°C]. NNE wind to around 17 mph [27 kph], with gusts to near 26 mph [42 kph]. Chance of precipitation 71% with QPF of 0.30 in [7.6 mm]. Sunday Light Drizzle with a high near 82°F [28°C]. NNE wind to around 12 mph [20 kph], with gusts to near 22 mph [36 kph]. Dewpoint near 61°F [16°C] with humidity of 97%. Pressure around 29.40 in [995.7 mb]. UV Index: 7.45. Chance of precipitation 21% with QPF of 0.01 in [0.2 mm]. Sunday Night Light Drizzle with a low around 61°F [16°C]. NNE wind to around 12 mph [20 kph], with gusts to near 22 mph [36 kph]. Chance of precipitation 21% with QPF of 0.01 in [0.2 mm]. Monday Clear with a high near 83°F [28°C]. ENE wind to around 9 mph [14 kph], with gusts to near 9 mph [14 kph]. Dewpoint near 61°F [16°C] with humidity of 95%. Pressure around 29.40 in [995.7 mb]. UV Index: 7.5. Chance of precipitation 18% with QPF of 0.00 in [0.0 mm]. Monday Night Clear with a low around 64°F [18°C]. ENE wind to around 9 mph [14 kph], with gusts to near 9 mph [14 kph]. Chance of precipitation 18% with QPF of 0.00 in [0.0 mm]. Tuesday Clear with a high near 86°F [30°C]. E wind to around 11 mph [18 kph], with gusts to near 18 mph [29 kph]. Dewpoint near 61°F [16°C] with humidity of 91%. Pressure around 29.40 in [995.7 mb]. UV Index: 7.5. Chance of precipitation 8% with QPF of 0.00 in [0.0 mm]. Tuesday Night Clear with a low around 63°F [17°C]. E wind to around 11 mph [18 kph], with gusts to near 18 mph [29 kph]. Chance of precipitation 8% with QPF of 0.00 in [0.0 mm].

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7 Day and Night - QPF Forecast for Alton, IL

Tonight: 0.0 mm | 0.00 in

Thursday: 0.0 mm | 0.00 in

Thursday Night: 0.0 mm | 0.00 in

Friday: 5.3 mm | 0.21 in

Friday Night: 5.3 mm | 0.21 in

Saturday: 7.6 mm | 0.30 in

Saturday Night: 7.6 mm | 0.30 in

Sunday: 0.2 mm | 0.01 in

Sunday Night: 0.2 mm | 0.01 in

Monday: 0.0 mm | 0.00 in

Monday Night: 0.0 mm | 0.00 in

Tuesday: 0.0 mm | 0.00 in

Tuesday Night: 0.0 mm | 0.00 in

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

Tonight: NE @ 12 kph | 8 mph

Thursday: E @ 11 kph | 7 mph

Thursday Night: E @ 11 kph | 7 mph

Friday: SSE @ 27 kph | 17 mph

Friday Night: SSE @ 27 kph | 17 mph

Saturday: NNE @ 27 kph | 17 mph

Saturday Night: NNE @ 27 kph | 17 mph

Sunday: NNE @ 20 kph | 12 mph

Sunday Night: NNE @ 20 kph | 12 mph

Monday: ENE @ 14 kph | 9 mph

Monday Night: ENE @ 14 kph | 9 mph

Tuesday: E @ 18 kph | 11 mph

Tuesday Night: E @ 18 kph | 11 mph

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

Tonight: 91 %

Thursday: 71 %

Thursday Night: 71 %

Friday: 93 %

Friday Night: 93 %

Saturday: 98 %

Saturday Night: 98 %

Sunday: 97 %

Sunday Night: 97 %

Monday: 95 %

Monday Night: 95 %

Tuesday: 91 %

Tuesday Night: 91 %

7 Day and Night - Snowfall Totals Forecast for Alton, 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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