Illinois Vejr Prognose
Illinois weather: 20°C, klart. Hver time forecast, 14-day outlook, UV, air quality and the best time og visit.
Will it rain in Illinois?
No - rain is unlikely in Illinois today.
Regn is very unlikely today - plans do not need a backup.
Over the next 7 days, about 0 mm of precipitation is forecast.
The next 7 days look unusually dry - roughly 0% of a normal oktober week (0 mm against 9 mm).
16-day forecast for Illinois
Maks. / Min.; Nedbør; UV
| Dag | Forhold | Maks. / Min. | Nedbør | Vind | UV |
|---|---|---|---|---|---|
| søn, okt 4 | ☀️ Klar himmel | 26° / 8° | 0% | 16 km/h | 5 |
| man, okt 5 | ☀️ Klar himmel | 24° / 10° | 0% | 10 km/h | 5 |
| tir, okt 6 | ☀️ Klar himmel | 25° / 10° | 1% | 18 km/h | 5 |
| ons, okt 7 | ☁️ Overskyet | 30° / 14° | 0% | 20 km/h | 5 |
| tor, okt 8 | ☁️ Overskyet | 24° / 13° | 4% | 16 km/h | 5 |
| fre, okt 9 | ☁️ Overskyet | 23° / 12° | 2% | 13 km/h | 4 |
| lør, okt 10 | ☁️ Overskyet | 28° / 13° | 3% | 20 km/h | 5 |
| søn, okt 11 | ☁️ Overskyet | 28° / 16° | 8% | 15 km/h | 4 |
| man, okt 12 | ☁️ Overskyet | 27° / 16° | 20% | 12 km/h | 5 |
| tir, okt 13 | 🌦️ Light showers | 30° / 16° | 14% · 2 mm | 23 km/h | 5 |
| ons, okt 14 | 🌦️ Light showers | 19° / 9° | 16% · 16 mm | 30 km/h | 3 |
| tor, okt 15 | ☁️ Overskyet | 11° / 5° | 13% | 27 km/h | 4 |
| fre, okt 16 | 🌦️ Let regn | 20° / 5° | 13% · 9 mm | 16 km/h | 4 |
| lør, okt 17 | 🌦️ Light drizzle | 15° / 7° | 11% · 1 mm | 23 km/h | 4 |
| søn, okt 18 | 🌦️ Light drizzle | 12° / 7° | 6% · 0 mm | 19 km/h | 3 |
| man, okt 19 | ☁️ Overskyet | 19° / 7° | 10% | 26 km/h | 4 |
What this means for Illinois
Today is warmer than average for oktober. The forecast high of 26°C is 6.1°C above the 20°C typical for this month.
Regn is very unlikely today - plans do not need a backup.
No weather-related travel disruption is expected today. Roads and airports should run normally.
Northern Hemisphere, so peak summer falls in juni og august.
The gap between the warmest and coldest month averages 29°C.
What og pack, what og skip
- Lightweight, light-coloured clothing and a refillable water bottle
- sønglasses, a brimmed hat and SPF 30+
- Layers - the daily swing is 22°C, so mornings feel nothing like afternoons
- If your dates are flexible, avoid januar, februar and december - historically the least comfortable months here.
Se prognosen for Illinois efter tidsinterval
Illinois weather - more answers
Explore Illinois
Every topic we hold for this place, and the same topic for the places around it.
Vejr for related places
Frequently asked questions
Where is Illinois?
Illinois is a state in USA. Its coordinates are 39.7817, -89.6501. It lies in Nordamerika.
What is the weather like in Illinois lige nu?
It is currently 20°C (68°F) med klart. Luftfugtighed is 39% and wind is 11 km/h.
When is the best time og visit Illinois?
august, september and oktober offer the most comfortable conditions in Illinois, which has a continental climate. januar, februar and december are usually the hardest months for outdoor plans.
What time zone is Illinois in?
Illinois observes America/Chicago (UTC-05:00). The local time is 8:53 PM.
How many people live in Illinois?
Illinois has a population of approximately 12.6 million.
What is the nearest airport og Illinois?
The closest airports are O'Hare International Airport (ORD), 284 km away and Nashville International Airport (BNA), 483 km away.
What are the top things og do in Illinois?
Popular options include Starved Rock State Park, Lake Michigan, Gateway Arch National Park and Indiana Dunes National Park.
What places are in Illinois?
Illinois covers 4 places in this atlas, including Chicago, Starved Rock State Park, Cook County and Lake Michigan.
Related articles
Data sources and methodology
| Place data | USPOTUS Atlas dataset (us-states) - coordinates, hierarchy and facts. |
|---|---|
| Prognose and observations | Open-Meteo (ECMWF and national models). |
| Luftkvalitet and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Klima averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Vejr Service. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated oktober 4, 2026 at 8:53 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
