Illinois Podnebie and Average Počasie
Podnebie of Illinois: average temperatures, rainfall and seasons month by month.
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° | 20° | 58 mm | ★★★★☆ |
| september | 27° | 16° | 42 mm | ★★★★☆ |
| október | 20° | 10° | 37 mm | ★★★★☆ |
| november | 12° | 4° | 79 mm | ★★★☆☆ |
| december | 6° | -2° | 62 mm | ★★☆☆☆ |
Podnebie type: Kontinental. Zdroj: Open-Meteo archive (ERA5).
Recent extremes in Illinois
Vysokéest and lowest readings observed in the last 3 years of reanalysis data - not all-time records.
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 | 1153 mm |
| St. Louis | 137 km | 15°C | +1°C warmer | 1153 mm |
| Missouri | 255 km | 15°C | +1°C warmer | 1004 mm |
| Indianapolis | 298 km | 13°C | 1°C cooler | 1119 mm |
| Indiana | 298 km | 13°C | 1°C cooler | 1119 mm |
Podnebie by city in Illinois
1 cities mapped in this atlas
Podnebie by state park in Illinois
1 state and provincial parks mapped in this atlas
Podnebie by county in Illinois
1 counties mapped in this atlas
Podnebie by lake in Illinois
1 lakes mapped in this atlas
Najlepší čas na návštevu Illinois
Go in máj, 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 this means for Illinois
Today is much warmer than average for september. The forecast high of 36°C is 9.6°C above the 27°C typical for this month.
A 23% chance means most of the area stays dry; a passing shower is possible but short.
No weather-related travel disruption is expected today. Roads and airports should run normally.
Northern Hemisphere, so peak summer falls in jún do august.
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
- neglasses, a brimmed hat and SPF 30+
- Avoid long hikes after mid-morning; start at dawn or leave it for a cooler day.
- If your dates are flexible, avoid január, február and december - historically the least comfortable months here.
Zhrnutie
Illinois is a state in Spojené štáty. Illinois is a US state s hlavným mestom Springfield. Má približne 12.6 million. Hlavným mestom je Springfield.
Momentálne je 22°C (71°F) in Illinois s zamračené. Pocitová teplota je 20°C. Dnes sa teploty pohybujú od 22°C do 36°C. Pravdepodobnosť zrážok je 23%. Sightseeing conditions score 8.8/10 - výborné — vyrazte teraz.
Najlepší čas na návštevu Illinois is máj, august, september and október. Podnebie je continental. január, február and december tend do be the least comfortable months. júl is the warmest month s average highs near 29°C, while január is the coldest s 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.
Jednoducho povedané. Today is much warmer than average for september. The forecast high of 36°C is 9.6°C above the 27°C typical for this month. The best window do be outside is roughly 7 AM do 10 AM, when temperature, rain chance and wind line up best. fishing is the strongest bet in Illinois today at 9/10. 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
| Typ | State |
|---|---|
| Krajina | Spojené štáty |
| Kontinent | Severná Amerika |
| Súradnice | 39°46′54.1″N 89°39′0.4″W (39.7817, -89.6501) |
| Capital | Springfield |
| Obyvateľstvo | 12.600.000 |
| Area | 149.995 km² |
| Abbreviation | IL |
| Časové pásmo | America/Chicago |
| Miestny čas | 2:00 AM (UTC-05:00) |
| Best months | máj, august, september and október |
| Podnebie | Kontinental |
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.
Explore Illinois
Every topic we hold for this place, and the same topic for the places around it.
Podnebie 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 22°C (71°F) s zamračené. Vlhkosť is 54% and wind is 17 km/h.
When is the best time do visit Illinois?
máj, 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 2:00 AM.
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 september 15, 2026 at 2:00 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
