Johnston City, Illinois 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Overcast 76°F 24°C Heat Index: 76°F	Observed at: Johnston City, IL	Elevation: 457 ft | 139 m
	Last Updated: July 23, 7:15 PM Timezone: GMT -5/-4
	Sky Conditions: Overcast	Temperature: 76°F | 24°C
	Pressure: 29.59 in | 1002.2 mb	Dewpoint: 55°F | 13°C
	Humidity: 48%	Wind: ENE 6 mph | ENE 10 kph
	Feels Like: 75°F | 24°C	Visibility: 84.8 mi | 136.5 km
	Lat/Long: 37.8206 | -88.9275	Sunrise: 5:51 AM   Sunset: 8:12 PM

7 Day Graphical Forecast

Valid: 10:21 AM 7/28/2026

Today Overcast 79 |60 °F 26 |16 °C 2% Chance Precipitation Friday Overcast 84 |63 °F 29 |17 °C 15% Chance Precipitation Saturday Heavy Rain 86 |68 °F 30 |20 °C 45% Chance Precipitation Sunday Overcast 99 |74 °F 37 |23 °C 10% Chance Precipitation Monday Overcast 100 |79 °F 38 |26 °C 4% Chance Precipitation Tuesday Overcast 105 |79 °F 41 |26 °C 13% Chance Precipitation Wednesday Overcast 89 |70 °F 32 |21 °C 13% Chance Precipitation

7 Hour Graphical Forecast

Valid: 10:21 AM 7/28/2026

10 AM Overcast 93 °F 2% Chance Precipitation

11 AM Overcast 93 °F 2% Chance Precipitation

12 PM Overcast 99 °F 2% Chance Precipitation

1 PM Clear 100 °F 2% Chance Precipitation

2 PM Mostly Clear 102 °F 2% Chance Precipitation

3 PM Partly Cloudy 104 °F 2% Chance Precipitation

4 PM Overcast 105 °F 2% Chance Precipitation

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

7 Day & Night Weather Forecast for Johnston City, IL - (Fahrenheit & Celsius) Valid: 10:21 AM 7/28/2026 Today Overcast with a high near 79°F [26°C]. NE wind to around 5 mph [9 kph], with gusts to near 14 mph [22 kph]. Dewpoint near 55°F [13°C] with humidity of 94%. Pressure around 29.59 in [1002.2 mb]. UV Index: 7.4. Chance of precipitation 2% with QPF of 0.00 in [0.0 mm]. Tonight Overcast with a low around 60°F [16°C]. NE wind to around 5 mph [9 kph], with gusts to near 14 mph [22 kph]. Chance of precipitation 2% with QPF of 0.00 in [0.0 mm]. Friday Overcast with a high near 84°F [29°C]. NE wind to around 5 mph [8 kph], with gusts to near 11 mph [18 kph]. Dewpoint near 55°F [13°C] with humidity of 74%. Pressure around 29.59 in [1002.2 mb]. UV Index: 6.05. Chance of precipitation 15% with QPF of 0.00 in [0.0 mm]. Friday Night Overcast with a low around 63°F [17°C]. NE wind to around 5 mph [8 kph], with gusts to near 11 mph [18 kph]. Chance of precipitation 15% with QPF of 0.00 in [0.0 mm]. Saturday Heavy Rain with a high near 86°F [30°C]. S wind to around 11 mph [18 kph], with gusts to near 26 mph [42 kph]. Dewpoint near 55°F [13°C] with humidity of 94%. Pressure around 29.59 in [1002.2 mb]. UV Index: 6.9. Chance of precipitation 45% with QPF of 2.74 in [69.5 mm]. Saturday Night Heavy Rain with a low around 68°F [20°C]. S wind to around 11 mph [18 kph], with gusts to near 26 mph [42 kph]. Chance of precipitation 45% with QPF of 2.74 in [69.5 mm]. Sunday Overcast with a high near 99°F [37°C]. SSW wind to around 8 mph [13 kph], with gusts to near 23 mph [37 kph]. Dewpoint near 55°F [13°C] with humidity of 97%. Pressure around 29.59 in [1002.2 mb]. UV Index: 7.65. Chance of precipitation 10% with QPF of 0.00 in [0.0 mm]. Sunday Night Overcast with a low around 74°F [23°C]. SSW wind to around 8 mph [13 kph], with gusts to near 23 mph [37 kph]. Chance of precipitation 10% with QPF of 0.00 in [0.0 mm]. Monday Overcast with a high near 100°F [38°C]. SSW wind to around 11 mph [18 kph], with gusts to near 32 mph [51 kph]. Dewpoint near 55°F [13°C] with humidity of 86%. Pressure around 29.59 in [1002.2 mb]. UV Index: 6.7. Chance of precipitation 4% with QPF of 0.00 in [0.0 mm]. Monday Night Overcast with a low around 79°F [26°C]. SSW wind to around 11 mph [18 kph], with gusts to near 32 mph [51 kph]. Chance of precipitation 4% with QPF of 0.00 in [0.0 mm]. Tuesday Overcast with a high near 105°F [41°C]. SW wind to around 15 mph [25 kph], with gusts to near 33 mph [53 kph]. Dewpoint near 55°F [13°C] with humidity of 76%. Pressure around 29.59 in [1002.2 mb]. UV Index: 7.85. Chance of precipitation 13% with QPF of 0.00 in [0.0 mm]. Tuesday Night Overcast with a low around 79°F [26°C]. SW wind to around 15 mph [25 kph], with gusts to near 33 mph [53 kph]. Chance of precipitation 13% with QPF of 0.00 in [0.0 mm]. Wednesday Overcast with a high near 89°F [32°C]. N wind to around 14 mph [22 kph], with gusts to near 12 mph [19 kph]. Dewpoint near 55°F [13°C] with humidity of 86%. Pressure around 29.59 in [1002.2 mb]. UV Index: 7.35. Chance of precipitation 13% with QPF of 0.00 in [0.0 mm]. Wednesday Night Overcast with a low around 70°F [21°C]. N wind to around 14 mph [22 kph], with gusts to near 12 mph [19 kph]. Chance of precipitation 13% with QPF of 0.00 in [0.0 mm].

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7 Day and Night - QPF Forecast for Johnston City, IL

Today: 0.0 mm | 0.00 in

Tonight: 0.0 mm | 0.00 in

Friday: 0.0 mm | 0.00 in

Friday Night: 0.0 mm | 0.00 in

Saturday: 69.5 mm | 2.74 in

Saturday Night: 69.5 mm | 2.74 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: 0.0 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 Johnston City, IL

Today: NE @ 9 kph | 5 mph

Tonight: NE @ 9 kph | 5 mph

Friday: NE @ 8 kph | 5 mph

Friday Night: NE @ 8 kph | 5 mph

Saturday: S @ 18 kph | 11 mph

Saturday Night: S @ 18 kph | 11 mph

Sunday: SSW @ 13 kph | 8 mph

Sunday Night: SSW @ 13 kph | 8 mph

Monday: SSW @ 18 kph | 11 mph

Monday Night: SSW @ 18 kph | 11 mph

Tuesday: SW @ 25 kph | 15 mph

Tuesday Night: SW @ 25 kph | 15 mph

Wednesday: N @ 22 kph | 14 mph

Wednesday Night: N @ 22 kph | 14 mph

7 Day and Night - Maximum Humidity Forecast for Johnston City, IL

Today: 94 %

Tonight: 94 %

Friday: 74 %

Friday Night: 74 %

Saturday: 94 %

Saturday Night: 94 %

Sunday: 97 %

Sunday Night: 97 %

Monday: 86 %

Monday Night: 86 %

Tuesday: 76 %

Tuesday Night: 76 %

Wednesday: 86 %

Wednesday Night: 86 %

7 Day and Night - Snowfall Totals Forecast for Johnston City, IL

Today: 0.0 cm | 0.00 in

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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