Petersburg, Illinois 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Overcast 78°F 26°C Heat Index: 78°F	Observed at: Petersburg, IL	Elevation: 557 ft | 170 m
	Last Updated: July 16, 10:30 PM Timezone: GMT -5/-4
	Sky Conditions: Overcast	Temperature: 78°F | 26°C
	Pressure: 29.44 in | 997 mb	Dewpoint: 73°F | 23°C
	Humidity: 86%	Wind: SW 4 mph | SW 6 kph
	Feels Like: 86°F | 30°C	Visibility: 31.4 mi | 50.5 km
	Lat/Long: 38.5922 | -89.9211	Sunrise: 5:48 AM   Sunset: 8:22 PM

7 Day Graphical Forecast

Valid: 10:35 PM 7/16/2026

Tonight Showers 76 °F 38% Chance Precipitation Friday Overcast 93 |74 °F 14% Chance Precipitation Saturday Overcast 96 |77 °F 32% Chance Precipitation Sunday Light Showers 90 |72 °F 32% Chance Precipitation Monday Light Drizzle 95 |70 °F 6% Chance Precipitation Tuesday Overcast 97 |67 °F 4% Chance Precipitation Wednesday Overcast 73 |60 °F 4% Chance Precipitation

7 Hour Graphical Forecast

Valid: 10:35 PM 7/16/2026

10 PM Overcast 79 °F 12% Chance Precipitation

11 PM Overcast 78 °F 6% Chance Precipitation

12 AM Partly Cloudy 77 °F 3% Chance Precipitation

1 AM Overcast 77 °F 3% Chance Precipitation

2 AM Mostly Clear 77 °F 3% Chance Precipitation

3 AM Clear 76 °F 3% Chance Precipitation

4 AM Clear 75 °F 6% Chance Precipitation

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

7 Day & Night Weather Forecast for Petersburg, IL - (Fahrenheit & Celsius) Valid: 10:35 PM 7/16/2026 Tonight Showers with a low around 76°F [25°C]. SW wind to around 7 mph [12 kph], with gusts to near 10 mph [16 kph]. Chance of precipitation 38% with QPF of 0.27 in [6.9 mm]. Friday Overcast with a high near 93°F [34°C]. W wind to around 10 mph [16 kph], with gusts to near 16 mph [25 kph]. Dewpoint near 73°F [23°C] with humidity of 93%. Pressure around 29.44 in [997 mb]. UV Index: 7.7. Chance of precipitation 14% with QPF of 0.00 in [0.0 mm]. Friday Night Overcast with a low around 74°F [23°C]. W wind to around 10 mph [16 kph], with gusts to near 16 mph [25 kph]. Chance of precipitation 14% with QPF of 0.00 in [0.0 mm]. Saturday Overcast with a high near 96°F [36°C]. W wind to around 14 mph [22 kph], with gusts to near 25 mph [40 kph]. Dewpoint near 73°F [23°C] with humidity of 75%. Pressure around 29.44 in [997 mb]. UV Index: 7.85. Chance of precipitation 32% with QPF of 0.00 in [0.0 mm]. Saturday Night Overcast with a low around 77°F [25°C]. W wind to around 14 mph [22 kph], with gusts to near 25 mph [40 kph]. Chance of precipitation 32% with QPF of 0.00 in [0.0 mm]. Sunday Light Showers with a high near 90°F [32°C]. N wind to around 10 mph [17 kph], with gusts to near 18 mph [29 kph]. Dewpoint near 73°F [23°C] with humidity of 95%. Pressure around 29.44 in [997 mb]. UV Index: 7.85. Chance of precipitation 32% with QPF of 0.38 in [9.6 mm]. Sunday Night Light Showers with a low around 72°F [22°C]. N wind to around 10 mph [17 kph], with gusts to near 18 mph [29 kph]. Chance of precipitation 32% with QPF of 0.38 in [9.6 mm]. Monday Light Drizzle with a high near 95°F [35°C]. SSE wind to around 10 mph [16 kph], with gusts to near 24 mph [39 kph]. Dewpoint near 73°F [23°C] with humidity of 97%. Pressure around 29.44 in [997 mb]. UV Index: 7.35. Chance of precipitation 6% with QPF of 0.02 in [0.4 mm]. Monday Night Light Drizzle with a low around 70°F [21°C]. SSE wind to around 10 mph [16 kph], with gusts to near 24 mph [39 kph]. Chance of precipitation 6% with QPF of 0.02 in [0.4 mm]. Tuesday Overcast with a high near 97°F [36°C]. WNW wind to around 21 mph [34 kph], with gusts to near 33 mph [54 kph]. Dewpoint near 73°F [23°C] with humidity of 84%. Pressure around 29.44 in [997 mb]. UV Index: 7.45. Chance of precipitation 4% with QPF of 0.00 in [0.0 mm]. Tuesday Night Overcast with a low around 67°F [20°C]. WNW wind to around 21 mph [34 kph], with gusts to near 33 mph [54 kph]. Chance of precipitation 4% with QPF of 0.00 in [0.0 mm]. Wednesday Overcast with a high near 73°F [23°C]. NNE wind to around 12 mph [19 kph], with gusts to near 28 mph [45 kph]. Dewpoint near 73°F [23°C] with humidity of 89%. Pressure around 29.44 in [997 mb]. UV Index: 7.3. Chance of precipitation 4% with QPF of 0.00 in [0.0 mm]. Wednesday Night Overcast with a low around 60°F [16°C]. NNE wind to around 12 mph [19 kph], with gusts to near 28 mph [45 kph]. Chance of precipitation 4% with QPF of 0.00 in [0.0 mm].

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7 Day and Night - QPF Forecast for Petersburg, IL

Tonight: 6.9 mm | 0.27 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: 9.6 mm | 0.38 in

Sunday Night: 9.6 mm | 0.38 in

Monday: 0.4 mm | 0.02 in

Monday Night: 0.4 mm | 0.02 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 Petersburg, IL

Tonight: SW @ 12 kph | 7 mph

Friday: W @ 16 kph | 10 mph

Friday Night: W @ 16 kph | 10 mph

Saturday: W @ 22 kph | 14 mph

Saturday Night: W @ 22 kph | 14 mph

Sunday: N @ 17 kph | 10 mph

Sunday Night: N @ 17 kph | 10 mph

Monday: SSE @ 16 kph | 10 mph

Monday Night: SSE @ 16 kph | 10 mph

Tuesday: WNW @ 34 kph | 21 mph

Tuesday Night: WNW @ 34 kph | 21 mph

Wednesday: NNE @ 19 kph | 12 mph

Wednesday Night: NNE @ 19 kph | 12 mph

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

Tonight: 95 %

Friday: 93 %

Friday Night: 93 %

Saturday: 75 %

Saturday Night: 75 %

Sunday: 95 %

Sunday Night: 95 %

Monday: 97 %

Monday Night: 97 %

Tuesday: 84 %

Tuesday Night: 84 %

Wednesday: 89 %

Wednesday Night: 89 %

7 Day and Night - Snowfall Totals Forecast for Petersburg, 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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