US National Weather Service Chicago Illinois

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A warm and humid pattern will continue through Wednesday with peak heat indices of 100-105F expected. Periodic chances f...
08/31/2026

A warm and humid pattern will continue through Wednesday with peak heat indices of 100-105F expected. Periodic chances for showers and storms are expected through weeks end, but many dry hours are expected too. Make sure to keep tabs on the forecast this week particularly if you have outdoor plans.

Hot and humid conditions are expected for Tuesday and Wednesday, especially during the afternoon hours. Peak heat indice...
08/31/2026

Hot and humid conditions are expected for Tuesday and Wednesday, especially during the afternoon hours. Peak heat indices of 100-105F are expected both days with locally higher heat indices possible south of I-80. Make sure to stay hydrated and limit time outdoors if possible.

Isolated to widely scattered showers and thunderstorms will continue to develop through early evening. No severe weather...
08/31/2026

Isolated to widely scattered showers and thunderstorms will continue to develop through early evening. No severe weather is expected, but any thunderstorms will produce lightning strikes and locally heavy downpours. Remember when thunder roars go indoors.

The air over the next few days will feel heavy with dew points in the low to mid 70s. The highest heat index values are ...
08/31/2026

The air over the next few days will feel heavy with dew points in the low to mid 70s. The highest heat index values are expected Tuesday and Wednesday, especially in the red shaded area. Meanwhile, occasional showers and storms will move through northern Illinois.

A warm and humid pattern is settling into the region for this week. The highest heat index values (greater than 100F) wi...
08/31/2026

A warm and humid pattern is settling into the region for this week. The highest heat index values (greater than 100F) will be along and south of I-80, especially Tuesday and Wednesday. Occasional showers and storms will move through areas north of I-80, as well.

Scattered showers will be possible this evening then there will be a low chance of thunderstorms around daybreak Monday ...
08/30/2026

Scattered showers will be possible this evening then there will be a low chance of thunderstorms around daybreak Monday morning and mainly for areas north of Interstate 80. There will be another chance of thunderstorms Tuesday morning, again for areas north of Interstate 80 and if these storms materialize, they may be strong to locally severe. Hot and humid conditions are expected through midweek and then a cold front will be nearby with increasing thunderstorm chances for the end of the week.

[12:33 PM CDT Sunday 8/30/2026]Expect on and off periods of rain with occasional rumbles of thunder into the early to mi...
08/30/2026

[12:33 PM CDT Sunday 8/30/2026]

Expect on and off periods of rain with occasional rumbles of thunder into the early to mid evening. The highest shower coverage (and a relatively higher chance for lightning) will focus north of I-80 (darker green shading on inset map).

If you hear thunder, go indoors or into a hard metal topped vehicle.

Widely scattered showers and storms are expected to persist through the morning. Severe weather is not expected, but the...
08/30/2026

Widely scattered showers and storms are expected to persist through the morning. Severe weather is not expected, but the main hazards are from lightning strikes and downpours.

A warmer and more humid pattern commences today amidst occasional opportunities for showers and thunderstorms.
08/30/2026

A warmer and more humid pattern commences today amidst occasional opportunities for showers and thunderstorms.

There is a low chance for showers and possibly an isolated thunderstorm late tonight through early Monday morning. Hot ...
08/29/2026

There is a low chance for showers and possibly an isolated thunderstorm late tonight through early Monday morning. Hot and humid conditions will return Monday with low chances for showers and thunderstorms midweek.

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