Illinois Météo Prévisions
Illinois weather: 15°C, ciel dégagé. Par heure forecast, 14-day outlook, UV, air quality and the best time à visit.
14-prévisions à Illinois
Maximales, minimales, précipitations et UV quotidiens.
| Jour | Conditions | Max / Min | Précip. | Vent | UV |
|---|---|---|---|---|---|
| jeu., oct 22 | 🌤️ Plutôt dégagé | 25° / 7° | 0% | 10 km/h | 4 |
| ven., oct 23 | ☁️ Couvert | 24° / 8° | 1% | 11 km/h | 4 |
| sam., oct 24 | ☁️ Couvert | 24° / 8° | 2% | 14 km/h | 4 |
| dim., oct 25 | ☁️ Couvert | 25° / 13° | 0% | 12 km/h | 4 |
| lun., oct 26 | ☁️ Couvert | 25° / 15° | 0% | 11 km/h | 4 |
| mar., oct 27 | ☁️ Couvert | 23° / 16° | 2% | 15 km/h | 3 |
| mer., oct 28 | ☁️ Couvert | 25° / 13° | 3% | 19 km/h | 4 |
| jeu., oct 29 | ☁️ Couvert | 26° / 15° | 6% | 22 km/h | 3 |
| ven., oct 30 | ☁️ Couvert | 22° / 16° | 10% | 18 km/h | 2 |
| sam., oct 31 | 🌦️ Averses légères | 18° / 15° | 31% · 10 mm | 30 km/h | 0 |
| dim., nov 1 | 🌦️ Bruine légère | 19° / 16° | 34% · 1 mm | 22 km/h | 1 |
| lun., nov 2 | 🌦️ Bruine légère | 16° / 12° | 22% · 1 mm | 17 km/h | 1 |
| mar., nov 3 | ☁️ Couvert | 17° / 10° | 23% | 21 km/h | 4 |
| mer., nov 4 | 🌦️ Bruine légère | 13° / 6° | 23% · 1 mm | 25 km/h | 2 |
The two-week trend
Cooling. The second half of the window averages 7°C cooler than the days immediately ahead.
The window averages 21°C against a octobre normal of 20°C – right on average.
The next 7 days look unusually dry – roughly 0% of a normal octobre week (0 mm against 9 mm).
What this means for Illinois
Today is warmer than average for octobre. The forecast high of 25°C is 4.3°C above the 20°C typical for this month.
Pluie 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 juin à août.
The gap between the warmest and coldest month averages 29°C.
What à pack, what à skip
- dim.glasses, a brimmed hat and SPF 30+
- Layers – the daily swing is 18°C, so mornings feel nothing like afternoons
- If your dates are flexible, avoid janvier, février and décembre – historically the least comfortable months here.
Voir les prévisions de Illinois par période
Illinois weather – more answers
Explore Illinois
Every topic we hold for this place, and the same topic for the places around it.
Météo for related places
Frequently asked questions
Where is Illinois?
Illinois is a state in États-Unis. Its coordinates are 39.7817, -89.6501. It lies in Amérique du Nord.
What is the weather like in Illinois maintenant?
It is currently 15°C (59°F) avec ciel dégagé. Humidité is 52% and wind is 7 km/h.
When is the best time à visit Illinois?
août, septembre and octobre offer the most comfortable conditions in Illinois, which has a continental climate. janvier, février and décembre are usually the hardest months for outdoor plans.
What time zone is Illinois in?
Illinois observes America/Chicago (UTC-05:00). The heure locale is 1:16 AM.
How many people live in Illinois?
Illinois has a population of approximately 12.6 million.
What is the nearest airport à 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 à 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. |
|---|---|
| Prévisions and observations | Open-Meteo (ECMWF and national models). |
| Qualité de l’air and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climat averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Météo 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 octobre 23, 2026 at 1:16 AM heure locale. Live blocks refresh every 15 minutes; climate averages monthly.
