textproduct: Central Illinois
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
KEY MESSAGES
- No major weather systems are expected to affect central and southeast Illinois through Thursday. The best chance of showers and isolated thunderstorms will be overnight Sunday night into early Monday. Temperatures will remain above normal, with highs in the low to mid 80s through the middle of next week, with mid to upper 80s late next week.
DISCUSSION
Issued at 215 PM CDT Fri May 29 2026
An Omega Block pattern continues across the country through the middle of next week, with upper level lows/trofs over the Western States and New England/East Coast and ridging over the Heartland including IL. Deeper moisture south and west of IL over MO into western KY and mid/western TN will keep best chances of convection to our south and west through Sunday. Isolated showers and thunderstorms appears to stay just sw and west of CWA tonight into Saturday evening. We have 20-30% chances of convection over west central CWA overnight Sat night into Sunday morning from Galesburg to SPI west, with higher pops just west of IL/MS river. Our best chances of convection is overnight Sunday night with likely pops in west central IL tapering to 20-30% pops in eastern/ne CWA. Pops then diminish during Monday to isolated chances.
Lows overnight in the lower 60s, with upper 50s in parts of east central IL. A bit cooler lows 55-60F Sat night with highs this in the low to mid 80s Saturday and Monday, warmest over the IL river valley. A bit cooler highs Sunday in the upper 70s/lower 80s. Upper level ridge to build stronger over IL as 500 mb heights rise to around 588 decameters Tue night/Wed and upper ridge remains over IL through middle of next week keep it warm and dry. Extended models show convection chances returning next Friday/Saturday.
The Climate Prediction Center (CPC) 8-14 Day Outlook for June 6-12th has 50-60% chance of above normal temperatures over central/se IL with precipitation trending near normal (33-40% below normal pcpn in northern IL).
AVIATION /00Z TAFS THROUGH 00Z SUNDAY/
Issued at 603 PM CDT Fri May 29 2026
VFR conditions will prevail the next 24 hours, with mainly high based ceilings. Light southeast winds this evening will trend more easterly overnight, before increasing to near 10 knots by mid morning.
ILX WATCHES/WARNINGS/ADVISORIES
None.
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