Illinois Tiempo Pronóstico
Illinois weather: 18°C, despejado. Por hora forecast, 14-day outlook, UV, air quality and the best time a visit.
Illinois weather in diciembre
One of the harder months here – go in con a plan.
diciembre runs 11°C cooler than the annual average in Illinois.
Tiempo map for Illinois
Animated model layers. Pick a layer a load it.
Animated layers by Vientoy. For pin-level detail and nearby places, see the interactive map below.
Clima in Illinois month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Mes | Máx. media | Mín. media | Precipitaciones | Valoración |
|---|---|---|---|---|
| enero | 1° | -7° | 62 mm | ★★☆☆☆ |
| febrero | 8° | -3° | 20 mm | ★★★☆☆ |
| marzo | 15° | 4° | 90 mm | ★★★☆☆ |
| abril | 19° | 9° | 135 mm | ★★★☆☆ |
| may | 24° | 13° | 100 mm | ★★★★☆ |
| junio | 28° | 19° | 117 mm | ★★★★☆ |
| julio | 29° | 21° | 129 mm | ★★★★☆ |
| agosto | 29° | 19° | 75 mm | ★★★★☆ |
| septiembre | 28° | 17° | 33 mm | ★★★★★ |
| octubre | 20° | 10° | 37 mm | ★★★★☆ |
| noviembre | 12° | 4° | 79 mm | ★★★☆☆ |
| diciembre | 6° | -2° | 62 mm | ★★☆☆☆ |
Clima type: Continenteal. Fuente: Open-Meteo archive (ERA5).
Mejor época para visitar Illinois
Go in agosto, septiembre and octubre. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: enero, febrero and diciembre – expect the least comfortable mix of heat, cold or rain.
What a pack, what a skip
- dom.glasses, a brimmed hat and SPF 30+
- Layers – the daily swing is 19°C, so mornings feel nothing like afternoons
- If your dates are flexible, avoid enero, febrero and diciembre – historically the least comfortable months here.
How Illinois compares con 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 |
Ver el pronóstico de Illinois por periodo
Illinois weather – more answers
Explore Illinois
Every topic we hold for this place, and the same topic for the places around it.
Tiempo for related places
Frequently asked questions
Where is Illinois?
Illinois is a state in Estados Unidos. Its coordinates are 39.7817, -89.6501. It lies in América del Norte.
What is the weather like in Illinois ahora mismo?
It is currently 18°C (64°F) con despejado. Humedad is 39% and wind is 8 km/h.
When is the best time a visit Illinois?
agosto, septiembre and octubre offer the most comfortable conditions in Illinois, which has a continental climate. enero, febrero and diciembre are usually the hardest months for outdoor plans.
What time zone is Illinois in?
Illinois observes America/Chicago (UTC-05:00). The hora local is 7:06 AM.
How many people live in Illinois?
Illinois has a population of approximately 12.6 million.
What is the nearest airport a 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 a 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. |
|---|---|
| Pronóstico and observations | Open-Meteo (ECMWF and national models). |
| Calidad del aire and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Clima averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Tiempo 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 octubre 25, 2026 at 7:06 AM hora local. Live blocks refresh every 15 minutes; climate averages monthly.
