Illinois Počasie Predpoveď
Illinois weather: 24°C, zamračené. Hodinovo forecast, 14-day outlook, UV, air quality and the best time do visit.
Illinois weather in august
One of the best months do visit Illinois.
august runs 10°C warmer than the annual average in Illinois.
Compare s september.
Počasie map for Illinois
Animated model layers. Pick a layer do load it.
Animated layers by Vietory. For pin-level detail and nearby places, see the interactive map below.
Podnebie in Illinois month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Mesiac | Avg high | Avg low | Dážďfall | Rating |
|---|---|---|---|---|
| január | 1° | -7° | 62 mm | ★★☆☆☆ |
| február | 8° | -3° | 20 mm | ★★★☆☆ |
| marec | 15° | 4° | 90 mm | ★★★☆☆ |
| apríl | 19° | 9° | 135 mm | ★★★☆☆ |
| máj | 24° | 13° | 100 mm | ★★★★☆ |
| jún | 28° | 19° | 117 mm | ★★★★☆ |
| júl | 29° | 21° | 129 mm | ★★★★☆ |
| august | 29° | 19° | 75 mm | ★★★★☆ |
| september | 28° | 17° | 33 mm | ★★★★★ |
| október | 20° | 10° | 37 mm | ★★★★☆ |
| november | 12° | 4° | 79 mm | ★★★☆☆ |
| december | 6° | -2° | 62 mm | ★★☆☆☆ |
Podnebie type: Kontinental. Zdroj: Open-Meteo archive (ERA5).
Najlepší čas na návštevu Illinois
Go in august, september and október. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: január, február and december - expect the least comfortable mix of heat, cold or rain.
What do pack, what do skip
- Lightweight, light-coloured clothing and a refillable water bottle
- neglasses, a brimmed hat and SPF 30+
- Layers - the daily swing is 26°C, so mornings feel nothing like afternoons
- A packable rain shell - 2 of the next 7 days carry a real chance of rain
- Avoid exposed ridgelines, small boats and rooftop viewpoints while gusts stay above 51 km/h.
- If your dates are flexible, avoid január, február and december - historically the least comfortable months here.
How Illinois compares s 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 |
Pozrite si predpoveď pre Illinois podľa časového obdobia
Illinois weather - more answers
Explore Illinois
Every topic we hold for this place, and the same topic for the places around it.
Počasie for related places
Frequently asked questions
Where is Illinois?
Illinois is a state in Spojené štáty. Its coordinates are 39.7817, -89.6501. It lies in Severná Amerika.
What is the weather like in Illinois práve teraz?
It is currently 24°C (75°F) s zamračené. Vlhkosť is 52% and wind is 10 km/h.
When is the best time do visit Illinois?
august, september and október offer the most comfortable conditions in Illinois, which has a continental climate. január, február 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 8:09 PM.
How many people live in Illinois?
Illinois has a population of approximately 12.6 million.
What is the nearest airport do 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 do 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. |
|---|---|
| Predpoveď and observations | Open-Meteo (ECMWF and national models). |
| Kvalita ovzdušia and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Podnebie averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Počasie 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 október 1, 2026 at 8:09 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
