Current Conditions

Mount Vernon, Illinois

91°F33°C

Hot

Feels like98°F36°C

Wind

SSW 5 mph8 km/h

Humidity

50%

Cloud Cover

94%

As of Wednesday, August 12, 2026 at 3:34 PM CDT

Today's Outlook

Day

Overcast and hot, with a high of 91°F33°C — feels like 100°F38°C. Light wind from the WSW around 6 mph9 km/h. Heat risk in the afternoon.

Night

Overcast, with a low around 80°F27°C. Breezy from the SE at 6 to 7 mph10 to 11 km/h.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Hot	High 91°F33°CFeels 100°F38°C	Low 80°F27°C	Precip 0.11 in2.9 mm—	Cloud 92%	Wind SSE 6 mph10 km/h	Wednesday: Overcast and hot, with a high of 91°F33°C — feels like 100°F38°C. Light wind from the WSW around 6 mph9 km/h. Heat risk in the afternoon. Wednesday Night: Overcast, with a low around 80°F27°C. Breezy from the SE at 6 to 7 mph10 to 11 km/h.
Hot	High 93°F34°CFeels 101°F38°C	Low 77°F25°C	Precip 0.03 in0.8 mm—	Cloud 83%	Wind SSE 5 mph8 km/h	Thursday: Overcast and hot, with a high of 93°F34°C and morning low of 77°F25°C — feels like 100°F38°C. Light wind from the SW around 5 mph7 km/h. Heat risk in the afternoon. Thursday Night: Mostly cloudy, with a low around 77°F25°C. Breezy from the SE at 6 to 7 mph9 to 11 km/h.
Hot	High 96°F35°CFeels 104°F40°C	Low 79°F26°C	Precip 0.01 in0.2 mm—	Cloud 68%	Wind S 5 mph8 km/h	Friday: Overcast and hot, with a high of 96°F35°C and morning low of 79°F26°C — feels like 104°F40°C. Light wind from the SSW around 5 mph7 km/h. Heat risk in the afternoon. Friday Night: Mostly cloudy, with a low around 80°F27°C. Light wind from the SSE around 6 mph9 km/h.
Hot	High 97°F36°CFeels 103°F40°C	Low 81°F27°CFeels 84°F29°C	Precip 0.02 in0.5 mm—	Cloud 52%	Wind SSW 5 mph9 km/h	Saturday: Mostly cloudy and hot, with a high of 97°F36°C and morning low of 81°F27°C — feels like 104°F40°C. Light wind from the SW around 5 mph8 km/h. Heat risk in the afternoon. Saturday Night: Partly cloudy, with a low around 82°F28°C. Light wind from the S around 6 mph9 km/h.
Hot	High 101°F39°C	Low 81°F27°CFeels 84°F29°C	Precip 0.01 in0.3 mm—	Cloud 34%	Wind WSW 6 mph10 km/h	Sunday: Partly cloudy and hot, with a high of 101°F39°C and morning low of 81°F27°C. Breezy from the WSW at 7 mph11 km/h. Heat risk in the afternoon. Sunday Night: Partly cloudy, with a low around 82°F28°C. Light wind from the SW around 6 mph10 km/h.
Hot	High 93°F34°CFeels 100°F38°C	Low 79°F26°C	Precip 0.04 in1.1 mm—	Cloud 46%	Wind NNW 6 mph10 km/h	Monday: Partly cloudy and hot, with a high of 93°F34°C and morning low of 79°F26°C — feels like 100°F38°C. Light wind from the NNW around 6 mph10 km/h. Heat risk in the afternoon. Monday Night: Partly cloudy, with a low around 81°F27°C. Light wind from the N around 6 mph10 km/h.
Hot	High 93°F34°CFeels 96°F35°C	Low 74°F23°C	Precip 0.07 in1.8 mm—	Cloud 36%	Wind NE 4 mph7 km/h	Tuesday: Partly cloudy and hot, with a high of 93°F34°C and morning low of 74°F23°C. Light wind from the NE around 4 mph6 km/h. Heat risk in the afternoon. Tuesday Night: Partly cloudy, with a low around 75°F24°C. Light wind from the ENE around 5 mph8 km/h.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	WednesdayAug 12	91°F33°C Feels 100°F38°C	80°F27°C	0.11 in2.9 mm· —	92%	Hot	SSE 6 mph10 km/h
DayOvercast and hot, with a high of 91°F33°C — feels like 100°F38°C. Light wind from the WSW around 6 mph9 km/h. Heat risk in the afternoon. NightOvercast, with a low around 80°F27°C. Breezy from the SE at 6 to 7 mph10 to 11 km/h.
	ThursdayAug 13	93°F34°C Feels 101°F38°C	77°F25°C	0.03 in0.8 mm· —	83%	Hot	SSE 5 mph8 km/h
DayOvercast and hot, with a high of 93°F34°C and morning low of 77°F25°C — feels like 100°F38°C. Light wind from the SW around 5 mph7 km/h. Heat risk in the afternoon. NightMostly cloudy, with a low around 77°F25°C. Breezy from the SE at 6 to 7 mph9 to 11 km/h.
	FridayAug 14	96°F35°C Feels 104°F40°C	79°F26°C	0.01 in0.2 mm· —	68%	Hot	S 5 mph8 km/h
DayOvercast and hot, with a high of 96°F35°C and morning low of 79°F26°C — feels like 104°F40°C. Light wind from the SSW around 5 mph7 km/h. Heat risk in the afternoon. NightMostly cloudy, with a low around 80°F27°C. Light wind from the SSE around 6 mph9 km/h.
	SaturdayAug 15	97°F36°C Feels 103°F40°C	81°F27°C Feels 84°F29°C	0.02 in0.5 mm· —	52%	Hot	SSW 5 mph9 km/h
DayMostly cloudy and hot, with a high of 97°F36°C and morning low of 81°F27°C — feels like 104°F40°C. Light wind from the SW around 5 mph8 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 82°F28°C. Light wind from the S around 6 mph9 km/h.
	SundayAug 16	101°F39°C	81°F27°C Feels 84°F29°C	0.01 in0.3 mm· —	34%	Hot	WSW 6 mph10 km/h
DayPartly cloudy and hot, with a high of 101°F39°C and morning low of 81°F27°C. Breezy from the WSW at 7 mph11 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 82°F28°C. Light wind from the SW around 6 mph10 km/h.
	MondayAug 17	93°F34°C Feels 100°F38°C	79°F26°C	0.04 in1.1 mm· —	46%	Hot	NNW 6 mph10 km/h
DayPartly cloudy and hot, with a high of 93°F34°C and morning low of 79°F26°C — feels like 100°F38°C. Light wind from the NNW around 6 mph10 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 81°F27°C. Light wind from the N around 6 mph10 km/h.
	TuesdayAug 18	93°F34°C Feels 96°F35°C	74°F23°C	0.07 in1.8 mm· —	36%	Hot	NE 4 mph7 km/h
DayPartly cloudy and hot, with a high of 93°F34°C and morning low of 74°F23°C. Light wind from the NE around 4 mph6 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 75°F24°C. Light wind from the ENE around 5 mph8 km/h.
	WednesdayAug 19	99°F37°C	76°F25°C	0.02 in0.5 mm· —	40%	Hot	S 6 mph10 km/h
DayPartly cloudy and hot, with a high of 99°F37°C and morning low of 76°F25°C. Breezy from the SSW at 6 to 7 mph10 to 12 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 77°F25°C. Breezy from the SSE at 6 to 7 mph10 to 12 km/h.
	ThursdayAug 20	96°F36°C	78°F26°C	0.04 in0.9 mm· —	42%	Hot	SW 7 mph11 km/h
DayPartly cloudy and hot, with a high of 96°F36°C and morning low of 78°F26°C. Breezy from the WSW at 7 mph11 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 80°F27°C. Breezy from the SSW at 7 to 8 mph11 to 12 km/h.
	FridayAug 21	95°F35°C	75°F24°C	0.05 in1.3 mm· —	35%	Hot	NNE 6 mph9 km/h
DayPartly cloudy and hot, with a high of 95°F35°C and morning low of 75°F24°C. Light wind from the NNW around 6 mph9 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 77°F25°C. Light wind from the ENE around 6 mph10 km/h.
	SaturdayAug 22	94°F35°C	74°F23°C	0.02 in0.5 mm· —	33%	Clear	NNE 6 mph10 km/h
DayPartly cloudy and hot, with a high of 94°F35°C and morning low of 74°F23°C. Light wind from the NNW around 6 mph9 km/h. NightPartly cloudy, with a low around 76°F24°C. Light wind from the ENE around 6 mph10 km/h.
	SundayAug 23	94°F35°C	73°F23°C	0.04 in1 mm· —	32%	Clear	NNE 6 mph10 km/h
DayPartly cloudy and hot, with a high of 94°F35°C and morning low of 73°F23°C. Light wind from the NNW around 6 mph10 km/h. NightPartly cloudy, with a low around 75°F24°C. Light wind from the NE around 6 mph9 km/h.
	MondayAug 24	93°F34°C	73°F23°C	0.03 in0.8 mm· —	38%	Clear	NE 6 mph10 km/h
DayPartly cloudy and hot, with a high of 93°F34°C and morning low of 73°F23°C. Light wind from the NNW around 6 mph10 km/h. NightPartly cloudy, with a low around 75°F24°C. Light wind from the ENE around 6 mph10 km/h.
	TuesdayAug 25	93°F34°C	72°F22°C	0.02 in0.5 mm· —	34%	Clear	NE 6 mph9 km/h
DayPartly cloudy and hot, with a high of 93°F34°C and morning low of 72°F22°C. Light wind from the N around 6 mph9 km/h. NightPartly cloudy, with a low around 74°F23°C. Light wind from the ENE around 6 mph10 km/h.
	WednesdayAug 26	92°F33°C	71°F22°C	0.02 in0.5 mm· —	33%	Clear	ENE 6 mph9 km/h
DayPartly cloudy and hot, with a high of 92°F33°C and morning low of 71°F22°C. Light wind from the NNE around 6 mph9 km/h. NightPartly cloudy, with a low around 73°F23°C. Light wind from the ENE around 6 mph9 km/h.

Nearby Cities

Marion41 mi65 km Carbondale44 mi71 km O'Fallon58 mi93 km Belleville60 mi97 km Fairview Heights62 mi99 km Collinsville63 mi102 km

About This Forecast

This forecast is powered by WeatherMesh, the world's most advanced and accurate weather model powered by AI. WeatherMesh is built on proprietary data from WindBorne's Global Sounding Balloon constellation — the world's largest fleet of autonomous, long-duration weather balloons — collecting observations across 100% of Earth, including over oceans and remote regions where no other data exists.

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Coordinates: 38.3173°N, 88.9031°W·Elevation: 156m·Timezone: America/Chicago·Population: 15,087