Illinois Vreme Prognoză
Illinois weather: 14°C, mai mult senin. Din oră în oră forecast, 14-day outlook, UV, air quality and the best time și visit.
Illinois weather in septembrie
One of the best months și visit Illinois.
septembrie runs 9°C warmer than the annual average in Illinois.
Compare cu august.
Vreme map for Illinois
Animated model layers. Pick a layer și load it.
Animated layers by Vânty. For pin-level detail and nearby places, see the interactive map below.
Climă in Illinois month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Lună | Avg high | Avg low | Ploaiefall | Rating |
|---|---|---|---|---|
| ianuarie | 1° | -7° | 62 mm | ★★☆☆☆ |
| februarie | 8° | -3° | 20 mm | ★★★☆☆ |
| martie | 15° | 4° | 90 mm | ★★★☆☆ |
| aprilie | 19° | 9° | 135 mm | ★★★☆☆ |
| mai | 24° | 13° | 100 mm | ★★★★☆ |
| iunie | 28° | 19° | 117 mm | ★★★★☆ |
| iulie | 29° | 21° | 129 mm | ★★★★☆ |
| august | 29° | 19° | 75 mm | ★★★★☆ |
| septembrie | 28° | 17° | 33 mm | ★★★★★ |
| octombrie | 20° | 10° | 37 mm | ★★★★☆ |
| noiembrie | 12° | 4° | 79 mm | ★★★☆☆ |
| decembrie | 6° | -2° | 62 mm | ★★☆☆☆ |
Climă type: Continental. Sursă: Open-Meteo archive (ERA5).
Cea mai bună perioadă Illinois
Go in august, septembrie and octombrie. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: ianuarie, februarie and decembrie - expect the least comfortable mix of heat, cold or rain.
What și pack, what și skip
- dumglasses, 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 ianuarie, februarie and decembrie - historically the least comfortable months here.
How Illinois compares cu 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 |
Vezi prognoza pentru Illinois pe intervale
Illinois weather - more answers
Explore Illinois
Every topic we hold for this place, and the same topic for the places around it.
Vreme for related places
Frequently asked questions
Where is Illinois?
Illinois is a state in Statele Unite ale Americii. Its coordinates are 39.7817, -89.6501. It lies in America de Nord.
What is the weather like in Illinois acum?
It is currently 14°C (57°F) cu mai mult senin. Umiditate is 71% and wind is 7 km/h.
When is the best time și visit Illinois?
august, septembrie and octombrie offer the most comfortable conditions in Illinois, which has a continental climate. ianuarie, februarie and decembrie 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 3:38 AM.
How many people live in Illinois?
Illinois has a population of approximately 12.6 million.
What is the nearest airport și 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 și 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. |
|---|---|
| Prognoză and observations | Open-Meteo (ECMWF and national models). |
| Calitatea aerului and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climă averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Vreme 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 octombrie 26, 2026 at 3:38 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
