Illinois Tempo Previsão
Illinois weather: 27°C, predominantemente limpo. Por hora forecast, 14-day outlook, UV, air quality and the best time a visit.
Illinois weather in dezembro
One of the harder months here – go in com a plan.
dezembro runs 11°C cooler than the annual average in Illinois.
Tempo map for Illinois
Animated model layers. Pick a layer a load it.
Animated layers by Ventoy. 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.
| Mês | Máxima média | Mínima média | Precipitação | Avaliação |
|---|---|---|---|---|
| janeiro | 1° | -7° | 62 mm | ★★☆☆☆ |
| fevereiro | 8° | -3° | 20 mm | ★★★☆☆ |
| março | 15° | 4° | 90 mm | ★★★☆☆ |
| abril | 19° | 9° | 135 mm | ★★★☆☆ |
| mai | 24° | 13° | 100 mm | ★★★★☆ |
| junho | 28° | 19° | 117 mm | ★★★★☆ |
| julho | 29° | 21° | 129 mm | ★★★★☆ |
| agosto | 29° | 19° | 75 mm | ★★★★☆ |
| setembro | 28° | 17° | 33 mm | ★★★★★ |
| outubro | 20° | 10° | 37 mm | ★★★★☆ |
| novembro | 12° | 4° | 79 mm | ★★★☆☆ |
| dezembro | 6° | -2° | 62 mm | ★★☆☆☆ |
Clima type: Continenteal. Fonte: Open-Meteo archive (ERA5).
Melhor época para visitar Illinois
Go in agosto, setembro and outubro. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: janeiro, fevereiro and dezembro – expect the least comfortable mix of heat, cold or rain.
What a pack, what a skip
- Lightweight, light-coloured clothing and a refillable water bottle
- dom.glasses, a brimmed hat and SPF 30+
- Layers – the daily swing is 28°C, so mornings feel nothing like afternoons
- A packable rain shell – 2 of the next 7 days carry a real chance of rain
- If your dates are flexible, avoid janeiro, fevereiro and dezembro – historically the least comfortable months here.
How Illinois compares com 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 a previsão de Illinois por período
Illinois weather – more answers
Explore Illinois
Every topic we hold for this place, and the same topic for the places around it.
Tempo 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 do Norte.
What is the weather like in Illinois agora?
It is currently 27°C (80°F) com predominantemente limpo. Humidade is 40% and wind is 10 km/h.
When is the best time a visit Illinois?
agosto, setembro and outubro offer the most comfortable conditions in Illinois, which has a continental climate. janeiro, fevereiro and dezembro 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 3:07 PM.
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. |
|---|---|
| Previsão and observations | Open-Meteo (ECMWF and national models). |
| Qualidade do ar 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 Tempo 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 setembro 30, 2026 at 3:07 PM hora local. Live blocks refresh every 15 minutes; climate averages monthly.
