Vandalia, Illinois 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Clear 88°F 31°C Heat Index: 101°F	Observed at: Vandalia, IL	Elevation: 561 ft | 171 m
	Last Updated: July 27, 7:15 PM Timezone: GMT -5/-4
	Sky Conditions: Clear	Temperature: 88°F | 31°C
	Pressure: 29.2 in | 988.8 mb	Dewpoint: 78°F | 26°C
	Humidity: 71%	Wind: SSW 7 mph | SSW 11 kph
	Feels Like: 98°F | 37°C	Visibility: 45.9 mi | 73.8 km
	Lat/Long: 38.9606 | -89.0936	Sunrise: 5:53 AM   Sunset: 8:12 PM

7 Day Graphical Forecast

Valid: 5:37 AM 7/29/2026

Today Overcast 91 |72 °F 33 |22 °C 16% Chance Precipitation Tuesday Overcast 92 |73 °F 33 |23 °C 5% Chance Precipitation Wednesday Overcast 82 |63 °F 28 |17 °C 1% Chance Precipitation Thursday Overcast 84 |63 °F 29 |17 °C 1% Chance Precipitation Friday Light Showers 73 |66 °F 23 |19 °C 45% Chance Precipitation Saturday Drizzle 78 |64 °F 25 |18 °C 52% Chance Precipitation Sunday Partly Cloudy 83 |63 °F 28 |17 °C 27% Chance Precipitation

7 Hour Graphical Forecast

Valid: 5:37 AM 7/29/2026

5 AM Clear 64 °F 1% Chance Precipitation

6 AM Clear 63 °F 1% Chance Precipitation

7 AM Clear 64 °F 0% Chance Precipitation

8 AM Clear 68 °F 0% Chance Precipitation

9 AM Clear 71 °F 0% Chance Precipitation

10 AM Clear 76 °F 0% 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 Vandalia, IL - (Fahrenheit & Celsius) Valid: 5:37 AM 7/29/2026 Today Overcast with a high near 91°F [33°C]. SSW wind to around 14 mph [22 kph], with gusts to near 26 mph [42 kph]. Dewpoint near 78°F [26°C] with humidity of 96%. Pressure around 29.20 in [988.8 mb]. UV Index: 7.3. Chance of precipitation 16% with QPF of 0.00 in [0.0 mm]. Tonight Overcast with a low around 72°F [22°C]. SSW wind to around 14 mph [22 kph], with gusts to near 26 mph [42 kph]. Chance of precipitation 16% with QPF of 0.00 in [0.0 mm]. Tuesday Overcast with a high near 92°F [33°C]. N wind to around 12 mph [19 kph], with gusts to near 24 mph [38 kph]. Dewpoint near 78°F [26°C] with humidity of 89%. Pressure around 29.20 in [988.8 mb]. UV Index: 7.6. Chance of precipitation 5% with QPF of 0.00 in [0.0 mm]. Tuesday Night Overcast with a low around 73°F [23°C]. N wind to around 12 mph [19 kph], with gusts to near 24 mph [38 kph]. Chance of precipitation 5% with QPF of 0.00 in [0.0 mm]. Wednesday Overcast with a high near 82°F [28°C]. NE wind to around 11 mph [17 kph], with gusts to near 16 mph [26 kph]. Dewpoint near 78°F [26°C] with humidity of 87%. Pressure around 29.20 in [988.8 mb]. UV Index: 7.6. Chance of precipitation 1% with QPF of 0.00 in [0.0 mm]. Wednesday Night Overcast with a low around 63°F [17°C]. NE wind to around 11 mph [17 kph], with gusts to near 16 mph [26 kph]. Chance of precipitation 1% with QPF of 0.00 in [0.0 mm]. Thursday Overcast with a high near 84°F [29°C]. SSE wind to around 8 mph [12 kph], with gusts to near 7 mph [11 kph]. Dewpoint near 78°F [26°C] with humidity of 89%. Pressure around 29.20 in [988.8 mb]. UV Index: 7.55. Chance of precipitation 1% with QPF of 0.00 in [0.0 mm]. Thursday Night Overcast with a low around 63°F [17°C]. SSE wind to around 8 mph [12 kph], with gusts to near 7 mph [11 kph]. Chance of precipitation 1% with QPF of 0.00 in [0.0 mm]. Friday Light Showers with a high near 73°F [23°C]. ESE wind to around 15 mph [23 kph], with gusts to near 31 mph [50 kph]. Dewpoint near 78°F [26°C] with humidity of 97%. Pressure around 29.20 in [988.8 mb]. UV Index: 1.6. Chance of precipitation 45% with QPF of 0.45 in [11.5 mm]. Friday Night Light Showers with a low around 66°F [19°C]. ESE wind to around 15 mph [23 kph], with gusts to near 31 mph [50 kph]. Chance of precipitation 45% with QPF of 0.45 in [11.5 mm]. Saturday Drizzle with a high near 78°F [25°C]. NE wind to around 13 mph [21 kph], with gusts to near 29 mph [47 kph]. Dewpoint near 78°F [26°C] with humidity of 98%. Pressure around 29.20 in [988.8 mb]. UV Index: 6.05. Chance of precipitation 52% with QPF of 0.11 in [2.7 mm]. Saturday Night Drizzle with a low around 64°F [18°C]. NE wind to around 13 mph [21 kph], with gusts to near 29 mph [47 kph]. Chance of precipitation 52% with QPF of 0.11 in [2.7 mm]. Sunday Partly Cloudy with a high near 83°F [28°C]. NNE wind to around 12 mph [19 kph], with gusts to near 27 mph [43 kph]. Dewpoint near 78°F [26°C] with humidity of 96%. Pressure around 29.20 in [988.8 mb]. UV Index: 7.35. Chance of precipitation 27% with QPF of 0.00 in [0.0 mm]. Sunday Night Partly Cloudy with a low around 63°F [17°C]. NNE wind to around 12 mph [19 kph], with gusts to near 27 mph [43 kph]. Chance of precipitation 27% with QPF of 0.00 in [0.0 mm].

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7 Day and Night - QPF Forecast for Vandalia, IL

Today: 0.0 mm | 0.00 in

Tonight: 0.0 mm | 0.00 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: 11.5 mm | 0.45 in

Friday Night: 11.5 mm | 0.45 in

Saturday: 2.7 mm | 0.11 in

Saturday Night: 2.7 mm | 0.11 in

Sunday: 0.0 mm | 0.00 in

Sunday Night: 0.0 mm | 0.00 in

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

Today: SSW @ 22 kph | 14 mph

Tonight: SSW @ 22 kph | 14 mph

Tuesday: N @ 19 kph | 12 mph

Tuesday Night: N @ 19 kph | 12 mph

Wednesday: NE @ 17 kph | 11 mph

Wednesday Night: NE @ 17 kph | 11 mph

Thursday: SSE @ 12 kph | 8 mph

Thursday Night: SSE @ 12 kph | 8 mph

Friday: ESE @ 23 kph | 15 mph

Friday Night: ESE @ 23 kph | 15 mph

Saturday: NE @ 21 kph | 13 mph

Saturday Night: NE @ 21 kph | 13 mph

Sunday: NNE @ 19 kph | 12 mph

Sunday Night: NNE @ 19 kph | 12 mph

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

Today: 96 %

Tonight: 96 %

Tuesday: 89 %

Tuesday Night: 89 %

Wednesday: 87 %

Wednesday Night: 87 %

Thursday: 89 %

Thursday Night: 89 %

Friday: 97 %

Friday Night: 97 %

Saturday: 98 %

Saturday Night: 98 %

Sunday: 96 %

Sunday Night: 96 %

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

Today: 0.0 cm | 0.00 in

Tonight: 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

Sunday: 0.0 cm | 0.00 in

Sunday Night: 0.0 cm | 0.00 in

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