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Grantfork, IL Weather Forecast

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Clear

96°F

Updated	3:23 pm
Feels Like	102°F
Humidity	41%
Wind	SW 10 mph
Barometer	29.99 in
Dew Point	69°F

Clear

36°C

Updated	3:23 pm
Feels Like	39°C
Humidity	41%
Wind	SW 16 km/h
Barometer	101.6 kPa
Dew Point	21°C

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Cloud Cover	0%
uv UV Index	9
Sunrise	6:29 AM
Sunset	7:28 PM
Moonrise	10:11 PM
Moonset	12:29 PM

Civil Twilight
5:59 AM to 6:26 AM
7:27 PM to 7:54 PM
Grantfork IL Weather - Waning Gibbous Moon

Waning Gibbous Moon

Grantfork Weather Forecast

THIS AFTERNOON	TONIGHT	THURSDAY	THURSDAY NIGHT	FRIDAY	FRIDAY NIGHT	SATURDAY	SATURDAY NIGHT	SUNDAY	SUNDAY NIGHT	LABOR DAY	MONDAY NIGHT

Sunny	Mostly Clear	Sunny	Mostly Clear	Sunny	Mostly Clear	Chance of T-Storm	Clearing	Chance of T-Storm	Mostly Clear	Mostly Clear	Partly Cloudy
Hi: 99°FHi: 37°C	Lo: 79°FLo: 26°C	Hi: 99°FHi: 37°C	Lo: 79°FLo: 26°C	Hi: 99°FHi: 37°C	Lo: 79°FLo: 26°C	Hi: 99°FHi: 37°C	Lo: 75°FLo: 24°C	Hi: 95°FHi: 35°C	Hi: 91°FHi: 33°C Lo: 71°FLo: 22°C	Hi: 91°FHi: 33°C Lo: 71°FLo: 22°C	Hi: 95°FHi: 35°C Lo: 71°FLo: 22°C
						POP: 20%		POP: 20%

POP = Probability of Precipitation.

Weather Outlook Updated: 127 PM CDT Wed Sep 02 2026 Grantfork, IL Weather - WeatherWorld.com

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Issued: 215 PM CDT Wed Sep 2 2026

Key Messages

The ongoing late summer heat is expected to continue through at least Saturday.
Slightly "cooler" temperatures are forecast Sunday into Labor Day before another period of near-record breaking heat returns for midweek.

Aviation

/18Z TAFS THROUGH 00Z FRIDAY/... Issued at 155 PM CDT Wed Sep 2 2026

Dry/VFR conditions are forecast with west/southwest winds backing this evening to the south and then veering to the west/southwest Thursday morning.

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/WARNINGS/ADVISO...

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Weather 101: Term of the Day

Unit Control Position

The WSR-88D radar operator uses this to control the entire radar system. One of the main things that the radar operator will do at the UCP is change volume scan strategies of the antenna. These volume scan strategies tell the radar how many elevation angles will be used during a single volume scan (a volume scan is the completion of a sequence of elevation angles), and the amount of time it will take to complete that sequence of elevation cuts, each one being a single rotation of the antenna's 1 degree beam at selected elevation angles. The WSR-88D uses 3 scan strategies. They are the following: 14 elevation angles in 5 minutes (this is used during severe weather situations), 9 elevation angles in 6 minutes (this is used when there is precipitation within 248 nautical miles of the radar), and 5 elevation angles in 10 minutes (this is used when there is no precipitation within 248 nautical miles). The radar operator at the UCP can also adjust the radar products and help the users out with their communication problems.