Illinois long range weather

This page presents a long range weather forecast for Illinois in May as well as other months. You can quickly get a brief overview of the weather to expect in May on a daily basis.

The Illinois extended forecast data provided is based on the average values of previous years.

See weather calendar ››

Select a month and click on a day for more information

Weather in April
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Weather in June >>

Illinois 30 days weather forecast

Check out our estimated 30 days weather forecast for Illinois, as mentioned above it based on the average weather in Illinois in the last few years and not on forecast models.

For a more accurate and detailed forecast, check out the 14 day weather for Illinois next to the desired date.

Our long range weather data for Illinois is updated daily in order to provide you with the most accurate weather data.

Sun	Mon	Tue	Wed	Thu	Fri	Sat
			1 19° /12°	2 15° /9°	3 13° /9°	4 10° /6°
5 13° /7°	6 12° /7°	7 15° /8°	8 13° /7°	9 15° /7°	10 15° /7°	11 15° /9°
12 15° /10°	13 17° /10°	14 17° /11°	15 16° /12°	16 18° /11°	17 15° /10°	18 19° /10°
19 20° /11°	20 17° /12°	21 17° /11°	22 20° /13°	23 21° /15°	24 20° /13°	25 23° /16°
26 20° /15°	27 19° /13°	28 18° /11°	29 19° /12°	30 21° /14°	31 22° /16°

Illinois long range weather forecast - FAQ

Do you provide 30 days weather forecast for Illinois?

You can see the next 30 weather forecast for Illinois at the top of the page, the next 14 days (from today) are more accurate, while the other is based on average of previous years.

Can I see the weather forecast for a particular date in Illinois?

Sure, you can select the date from the calendar above to view the forecast in Illinois on that date.

How accurate is the long-range weather forecast for Illinois?

Our long-range weather forecast for Illinois is provided by using statistics from previous years. Although we cannot predict the weather months in advance, we can see an average.

Can I see a long-range weather forecast for different countries?

Yes, we provide a 14 day weather forecast and a long-range weather forecast for different countries and cities. You can search for a location in the search box at the top of the page.

Cities in Illinois

For a more accurate weather forecast please select a city

Aurora Champaign Chicago Elgin Joliet Naperville Quincy Rockford Springfield Sterling

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More about the weather in Illinois