Illinois Iklim and Average Cuaca
Iklim of Illinois: average temperatures, rainfall and seasons month by month.
Iklim in Illinois month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Bulan | Avg high | Avg low | Hujanfall | Rating |
|---|---|---|---|---|
| Januari | 1° | -7° | 62 mm | ★★☆☆☆ |
| Februari | 8° | -3° | 20 mm | ★★★☆☆ |
| Maret | 15° | 4° | 90 mm | ★★★☆☆ |
| April | 19° | 9° | 135 mm | ★★★☆☆ |
| Mei | 24° | 13° | 100 mm | ★★★★☆ |
| Juni | 28° | 19° | 117 mm | ★★★★☆ |
| Juli | 29° | 21° | 129 mm | ★★★★☆ |
| Agustus | 29° | 19° | 75 mm | ★★★★☆ |
| September | 28° | 17° | 33 mm | ★★★★★ |
| Oktober | 20° | 10° | 37 mm | ★★★★☆ |
| November | 12° | 4° | 79 mm | ★★★☆☆ |
| Desember | 6° | -2° | 62 mm | ★★☆☆☆ |
Iklim type: Benuaal. Sumber: Open-Meteo archive (ERA5).
Recent extremes in Illinois
Tinggiest and lowest readings observed in the last 3 years of reanalysis data - not all-time records.
How Illinois compares dengan 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 |
Iklim by city in Illinois
1 cities mapped in this atlas
Iklim by state park in Illinois
1 state and provincial parks mapped in this atlas
Iklim by county in Illinois
1 counties mapped in this atlas
Iklim by lake in Illinois
1 lakes mapped in this atlas
Waktu terbaik untuk berkunjung Illinois
Go in Agustus, September and Oktober. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: Januari, Februari and Desember - expect the least comfortable mix of heat, cold or rain.
What this means for Illinois
Today is warmer than average for Oktober. The forecast high of 26°C is 6.1°C above the 20°C typical for this month.
Hujan is very unlikely today - plans do not need a backup.
No weather-related travel disruption is expected today. Roads and airports should run normally.
Northern Hemisphere, so peak summer falls in Juni hingga Agustus.
The gap between the warmest and coldest month averages 29°C.
What hingga pack, what hingga skip
- Lightweight, light-coloured clothing and a refillable water bottle
- Minglasses, 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 Desember - historically the least comfortable months here.
Ringkasan
Illinois is a state in Amerika Serikat. Illinois is a US state dengan ibu kota Springfield. Berpenduduk sekitar 12.6 million. Ibu kotanya adalah Springfield.
Saat ini suhu 25°C (78°F) in Illinois dengan langit cerah. Terasa seperti 22°C. Hari ini suhu berkisar 8°C hingga 26°C. Peluang hujan adalah 0%. Sightseeing conditions score 9.5/10 - sangat baik — berangkat sekarang.
Waktu terbaik mengunjungi Illinois is Agustus, September and Oktober. Iklimnya continental. Januari, Februari and Desember tend hingga be the least comfortable months. Juli is the warmest month dengan average highs near 29°C, while Januari is the coldest dengan lows near -7°C.
The closest major airport is O'Hare International Airport (ORD), about 284 km away. Nearby highlights include Starved Rock State Park, Lake Michigan, Gateway Arch National Park and Indiana Dunes National Park.
Singkatnya. Today is warmer than average for Oktober. The forecast high of 26°C is 6.1°C above the 20°C typical for this month. The best window hingga be outside is roughly 11 AM hingga 2 PM, when temperature, rain chance and wind line up best. stargazing is the strongest bet in Illinois today at 10/10. No weather-related travel disruption is expected today. Roads and airports should run normally.
Compiled from this page's own data: atlas facts plus live Open-Meteo readings.
Quick facts about Illinois
| Jenis | State |
|---|---|
| Negara | Amerika Serikat |
| Benua | Amerika Utara |
| Koordinat | 39°46′54.1″N 89°39′0.4″W (39.7817, -89.6501) |
| Capital | Springfield |
| Populasi | 12.600.000 |
| Area | 149.995 km² |
| Abbreviation | IL |
| Zona waktu | America/Chicago |
| Waktu lokal | 4:59 PM (UTC-05:00) |
| Best months | Agustus, September and Oktober |
| Iklim | Benuaal |
Cuaca map for Illinois
Animated model layers. Pick a layer hingga load it.
Animated layers by Anginy. For pin-level detail and nearby places, see the interactive map below.
Explore Illinois
Every topic we hold for this place, and the same topic for the places around it.
Iklim for related places
Frequently asked questions
Where is Illinois?
Illinois is a state in Amerika Serikat. Its coordinates are 39.7817, -89.6501. It lies in Amerika Utara.
What is the weather like in Illinois sekarang?
It is currently 25°C (78°F) dengan langit cerah. Kelembapan is 29% and wind is 14 km/h.
When is the best time hingga visit Illinois?
Agustus, September and Oktober offer the most comfortable conditions in Illinois, which has a continental climate. Januari, Februari and Desember 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 4:59 PM.
How many people live in Illinois?
Illinois has a population of approximately 12.6 million.
What is the nearest airport hingga 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 hingga 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. |
|---|---|
| Prakiraan and observations | Open-Meteo (ECMWF and national models). |
| Kualitas udara and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Iklim averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Cuaca 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 4, 2026 at 4:59 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
