Illinois Podnebje and Average Vreme
Podnebje of Illinois: average temperatures, rainfall and seasons month by month.
Podnebje in Illinois month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Mesec | Avg high | Avg low | Dežfall | Rating |
|---|---|---|---|---|
| januar | 1° | -7° | 62 mm | ★★☆☆☆ |
| februar | 8° | -3° | 20 mm | ★★★☆☆ |
| marec | 15° | 4° | 90 mm | ★★★☆☆ |
| april | 19° | 9° | 135 mm | ★★★☆☆ |
| maj | 24° | 13° | 100 mm | ★★★★☆ |
| junij | 28° | 19° | 117 mm | ★★★★☆ |
| julij | 29° | 21° | 129 mm | ★★★★☆ |
| avgust | 29° | 19° | 75 mm | ★★★★☆ |
| september | 28° | 17° | 33 mm | ★★★★★ |
| oktober | 20° | 10° | 37 mm | ★★★★☆ |
| november | 12° | 4° | 79 mm | ★★★☆☆ |
| december | 6° | -2° | 62 mm | ★★☆☆☆ |
Podnebje type: Celinaal. Vir: Open-Meteo archive (ERA5).
Recent extremes in Illinois
Visokoest and lowest readings observed in the last 3 years of reanalysis data - not all-time records.
How Illinois compares z 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 |
Podnebje by city in Illinois
1 cities mapped in this atlas
Podnebje by state park in Illinois
1 state and provincial parks mapped in this atlas
Podnebje by county in Illinois
1 counties mapped in this atlas
Podnebje by lake in Illinois
1 lakes mapped in this atlas
Najboljši čas za obisk Illinois
Go in avgust, september and oktober. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: januar, februar and december - expect the least comfortable mix of heat, cold or rain.
What this means for Illinois
Today is slightly warmer than average for oktober. The forecast high of 24°C is 3.5°C above the 20°C typical for this month.
Dež 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 junij do avgust.
The gap between the warmest and coldest month averages 29°C.
What do pack, what do skip
- Lightweight, light-coloured clothing and a refillable water bottle
- nedglasses, a brimmed hat and SPF 30+
- Layers - the daily swing is 22°C, so mornings feel nothing like afternoons
- If your dates are flexible, avoid januar, februar and december - historically the least comfortable months here.
Povzetek
Illinois is a state in Združene države Amerike. Illinois is a US state s prestolnico Springfield. Ima približno 12.6 million. Glavno mesto je Springfield.
Trenutno je 23°C (73°F) in Illinois z jasno nebo. Občutek je 21°C. Danes so temperature od 7°C do 24°C. Verjetnost padavin je 0%. Sightseeing conditions score 9.9/10 - odlično — odpravite se zdaj.
Najboljši čas za obisk Illinois is avgust, september and oktober. Podnebje je continental. januar, februar and december tend do be the least comfortable months. julij is the warmest month z average highs near 29°C, while januar is the coldest z 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.
Preprosto povedano. Today is slightly warmer than average for oktober. The forecast high of 24°C is 3.5°C above the 20°C typical for this month. The best window do be outside is roughly 10 AM do 1 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
| Vrsta | State |
|---|---|
| Država | Združene države Amerike |
| Celina | Severna Amerika |
| Koordinate | 39°46′54.1″N 89°39′0.4″W (39.7817, -89.6501) |
| Capital | Springfield |
| Prebivalstvo | 12.600.000 |
| Area | 149.995 km² |
| Abbreviation | IL |
| Časovni pas | America/Chicago |
| Lokalni čas | 6:49 PM (UTC-05:00) |
| Best months | avgust, september and oktober |
| Podnebje | Celinaal |
Vreme map for Illinois
Animated model layers. Pick a layer do load it.
Animated layers by Vetery. 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.
Podnebje for related places
Frequently asked questions
Where is Illinois?
Illinois is a state in Združene države Amerike. Its coordinates are 39.7817, -89.6501. It lies in Severna Amerika.
What is the weather like in Illinois zdaj?
It is currently 23°C (73°F) z jasno nebo. Vlažnost is 30% and wind is 4 km/h.
When is the best time do visit Illinois?
avgust, september and oktober offer the most comfortable conditions in Illinois, which has a continental climate. januar, februar 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 6:49 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. |
|---|---|
| Napoved and observations | Open-Meteo (ECMWF and national models). |
| Kakovost zraka and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Podnebje 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 oktober 5, 2026 at 6:49 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
