Illinois Weer Voorspelling
Illinois weather: 17°C, onbewolkt. Per uur forecast, 14-day outlook, UV, air quality and the best time en visit.
Illinois weather in april
A workable month, met trade-offs.
april runs close en the annual average in Illinois.
Weer map for Illinois
Animated model layers. Pick a layer en load it.
Animated layers by Windy. For pin-level detail and nearby places, see the interactive map below.
Klimaat in Illinois month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Maand | Gem. maximum | Gem. minimum | Neerslag | Beoordeling |
|---|---|---|---|---|
| januari | 1° | -7° | 62 mm | ★★☆☆☆ |
| februari | 8° | -3° | 20 mm | ★★★☆☆ |
| maart | 15° | 4° | 90 mm | ★★★☆☆ |
| april | 19° | 9° | 135 mm | ★★★☆☆ |
| mei | 24° | 13° | 100 mm | ★★★★☆ |
| juni | 28° | 19° | 117 mm | ★★★★☆ |
| juli | 29° | 21° | 129 mm | ★★★★☆ |
| augustus | 29° | 19° | 75 mm | ★★★★☆ |
| september | 28° | 17° | 33 mm | ★★★★★ |
| oktober | 20° | 10° | 37 mm | ★★★★☆ |
| november | 12° | 4° | 79 mm | ★★★☆☆ |
| december | 6° | -2° | 62 mm | ★★☆☆☆ |
Klimaat type: Continental. Bron: Open-Meteo archive (ERA5).
Beste reistijd Illinois
Go in augustus, september and oktober. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: januari, februari and december – expect the least comfortable mix of heat, cold or rain.
What en pack, what en skip
- Lightweight, light-coloured clothing and a refillable water bottle
- zoglasses, a brimmed hat and SPF 30+
- Layers – the daily swing is 23°C, so mornings feel nothing like afternoons
- If your dates are flexible, avoid januari, februari and december – historically the least comfortable months here.
How Illinois compares met nearby places
Annual averages, and the difference against Illinois.
| Place | Distance | Avg temp | vs here | Annual rain |
|---|---|---|---|---|
| Gateway Arch National Park | 137 km | 15°C | +1°C warmer | 1156 mm |
| St. Louis | 137 km | 15°C | +1°C warmer | 1156 mm |
| Missouri | 255 km | 15°C | +1°C warmer | 1006 mm |
| Indianapolis | 298 km | 13°C | 1°C cooler | 1135 mm |
| Indiana | 298 km | 13°C | 1°C cooler | 1135 mm |
Bekijk de voorspelling voor Illinois per periode
Illinois weather – more answers
Explore Illinois
Every topic we hold for this place, and the same topic for the places around it.
Weer for related places
Frequently asked questions
Where is Illinois?
Illinois is a state in Verenigde Staten. Its coordinates are 39.7817, -89.6501. It lies in Noord-Amerika.
What is the weather like in Illinois nu?
It is currently 17°C (62°F) met onbewolkt. Luchtvochtigheid is 45% and wind is 5 km/h.
When is the best time en visit Illinois?
augustus, september and oktober offer the most comfortable conditions in Illinois, which has a continental climate. januari, februari and december are usually the hardest months for outdoor plans.
What time zone is Illinois in?
Illinois observes America/Chicago (UTC-05:00). The lokale tijd is 11:08 PM.
How many people live in Illinois?
Illinois has a population of approximately 12.6 million.
What is the nearest airport en 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 en 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. |
|---|---|
| Voorspelling and observations | Open-Meteo (ECMWF and national models). |
| Luchtkwaliteit and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Klimaat averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Weer 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 5, 2026 at 11:08 PM lokale tijd. Live blocks refresh every 15 minutes; climate averages monthly.
