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

- Cooler and less active weather is on deck for this week, but it won't be completely dry. There is a 40-60% chance for showers and thunderstorms this evening into tomorrow afternoon.

- Temperatures for the next week will be in the upper 70s to 80s for highs and 60s for lows. The CPC 6-10 and 8-14 day outlooks have been trending toward normal temperatures with their recent forecast.

DISCUSSION

Issued at 154 AM CDT Tue Aug 18 2026

Beautiful August weather is in store for the next week. Temperatures for the next week will be in the upper 70s to 80s for highs and 60s for lows. The CPC 6-10 and 8-14 day outlooks have been trending toward normal temperatures with their recent forecast.

A high pressure center has been drifting overhead but it will get pushed off to the east by incoming frontal boundaries later this evening. SPC has central IL in a marginal risk for severe weather today west of a Vandalia-Decatur-Paxton line. The HRRR and the RRFS are depicting a mostly dry solution, with limited activity if any. The NAMNest is a bit more bullish with more widespread shower/storm activity. If any storms can develop this evening, a damaging wind threat is possible.

Additional chances for rain exist through Friday, then a dry weekend is on deck. Wednesday and Thursday are not expected to have any severe weather at this time, with the majority of the rain that may occur those two days being south of I-74/Danville, providing a well deserved break from the heavy rain. With the multiple days with POPs in the forecast, most people will likely remain dry or see minimal rainfall amounts through Saturday morning.

AVIATION /06Z TAFS THROUGH 06Z WEDNESDAY/

Issued at 1157 PM CDT Mon Aug 17 2026

Light winds and clear skies will allow patchy light fog and sporadic MVFR visibilities early this morning. Mid level clouds increase on Tuesday as the next weather system passes to our southwest. 5-10 kt southwest winds will be common for Tuesday afternoon.

ILX WATCHES/WARNINGS/ADVISORIES

None.

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