Illinois Clima and Average Meteo
Clima of Illinois: average temperatures, rainfall and seasons month by month.
Clima in Illinois month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Mese | Massima media | Minima media | Precipitazioni | Valutazione |
|---|---|---|---|---|
| gennaio | 1° | -7° | 62 mm | ★★☆☆☆ |
| febbraio | 8° | -3° | 20 mm | ★★★☆☆ |
| marzo | 15° | 4° | 90 mm | ★★★☆☆ |
| aprile | 19° | 9° | 135 mm | ★★★☆☆ |
| mag | 24° | 13° | 100 mm | ★★★★☆ |
| giugno | 28° | 19° | 117 mm | ★★★★☆ |
| luglio | 29° | 21° | 129 mm | ★★★★☆ |
| agosto | 29° | 19° | 75 mm | ★★★★☆ |
| settembre | 28° | 17° | 33 mm | ★★★★★ |
| ottobre | 20° | 10° | 37 mm | ★★★★☆ |
| novembre | 12° | 4° | 79 mm | ★★★☆☆ |
| dicembre | 6° | -2° | 62 mm | ★★☆☆☆ |
Clima type: Continenteal. Fonte: Open-Meteo archive (ERA5).
Recent extremes in Illinois
Altoest and lowest readings observed in the last 3 years of reanalysis data – not all-time records.
How Illinois compares con 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 |
Clima by city in Illinois
1 cities mapped in this atlas
Clima by state park in Illinois
1 state and provincial parks mapped in this atlas
Clima by county in Illinois
1 counties mapped in this atlas
Clima by lake in Illinois
1 lakes mapped in this atlas
Periodo migliore per visitare Illinois
Go in agosto, settembre and ottobre. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: gennaio, febbraio and dicembre – expect the least comfortable mix of heat, cold or rain.
What this means for Illinois
Today is slightly warmer than average for ottobre. The forecast high of 24°C is 3.2°C above the 20°C typical for this month.
Pioggia 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 giugno a agosto.
The gap between the warmest and coldest month averages 29°C.
What a pack, what a skip
- domglasses, 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 gennaio, febbraio and dicembre – historically the least comfortable months here.
Riepilogo
Illinois is a state in Stati Uniti. Illinois is a US state con capitale Springfield. Ha una popolazione di circa 12.6 million. La capitale è Springfield.
Attualmente ci sono 9°C (49°F) in Illinois con sereno. La temperatura percepita è di 8°C. Oggi le temperature vanno da 7°C a 24°C. La probabilità di precipitazioni è del 1%. Le condizioni per le visite turistiche sono valutate 8.8/10 – eccellente — vai ora.
Il periodo migliore per visitare Illinois is agosto, settembre and ottobre. Il clima è continental. gennaio, febbraio and dicembre tendono a essere i mesi meno confortevoli. luglio è il mese più caldo, con massime medie intorno a 29°C, mentre gennaio è il mese più freddo, con minime intorno a -7°C.
L'aeroporto principale più vicino è O'Hare International Airport (ORD), about 284 km away. Tra i luoghi di interesse nelle vicinanze ci sono Starved Rock State Park, Lake Michigan, Gateway Arch National Park and Indiana Dunes National Park.
In parole semplici. Today is slightly warmer than average for ottobre. The forecast high of 24°C is 3.2°C above the 20°C typical for this month. The best window a be outside is roughly 11 AM a 2 PM, when temperature, rain chance and wind line up best. stargazing is the strongest bet in Illinois today at 9.9/10. 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
| Tipo | State |
|---|---|
| Paese | Stati Uniti |
| Continente | America del Nord |
| Coordinate | 39°46′54.1″N 89°39′0.4″W (39.7817, -89.6501) |
| Capital | Springfield |
| Popolazione | 12.600.000 |
| Area | 149.995 km² |
| Abbreviation | IL |
| Fuso orario | America/Chicago |
| Ora locale | 2:45 AM (UTC-05:00) |
| Mesi migliori | agosto, settembre and ottobre |
| Clima | Continenteal |
Meteo map for Illinois
Animated model layers. Pick a layer a load it.
Animated layers by Ventoy. 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.
Clima for related places
Frequently asked questions
Where is Illinois?
Illinois is a state in Stati Uniti. Its coordinates are 39.7817, -89.6501. It lies in America del Nord.
What is the weather like in Illinois ora?
It is currently 9°C (49°F) con sereno. Umidità is 78% and wind is 5 km/h.
When is the best time a visit Illinois?
agosto, settembre and ottobre offer the most comfortable conditions in Illinois, which has a continental climate. gennaio, febbraio and dicembre are usually the hardest months for outdoor plans.
What time zone is Illinois in?
Illinois observes America/Chicago (UTC-05:00). The ora locale is 2:45 AM.
How many people live in Illinois?
Illinois has a population of approximately 12.6 million.
What is the nearest airport a 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 a 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. |
|---|---|
| Previsioni and observations | Open-Meteo (ECMWF and national models). |
| Qualità dell’aria and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Clima averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Meteo 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 ottobre 23, 2026 at 2:45 AM ora locale. Live blocks refresh every 15 minutes; climate averages monthly.
