Illinois Clima and Average Tempo
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.
| Mês | Máxima média | Mínima média | Precipitação | Avaliação |
|---|---|---|---|---|
| janeiro | 1° | -7° | 62 mm | ★★☆☆☆ |
| fevereiro | 8° | -3° | 20 mm | ★★★☆☆ |
| março | 15° | 4° | 90 mm | ★★★☆☆ |
| abril | 19° | 9° | 135 mm | ★★★☆☆ |
| mai | 24° | 13° | 100 mm | ★★★★☆ |
| junho | 28° | 19° | 117 mm | ★★★★☆ |
| julho | 29° | 21° | 129 mm | ★★★★☆ |
| agosto | 29° | 19° | 75 mm | ★★★★☆ |
| setembro | 28° | 17° | 33 mm | ★★★★★ |
| outubro | 20° | 10° | 37 mm | ★★★★☆ |
| novembro | 12° | 4° | 79 mm | ★★★☆☆ |
| dezembro | 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 com 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
Melhor época para visitar Illinois
Go in agosto, setembro and outubro. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: janeiro, fevereiro and dezembro – expect the least comfortable mix of heat, cold or rain.
What this means for Illinois
Today is slightly warmer than average for outubro. The forecast high of 24°C is 3.4°C above the 20°C typical for this month.
Chuva 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 junho a agosto.
The gap between the warmest and coldest month averages 29°C.
What a pack, what a skip
- dom.glasses, a brimmed hat and SPF 30+
- Layers – the daily swing is 17°C, so mornings feel nothing like afternoons
- If your dates are flexible, avoid janeiro, fevereiro and dezembro – historically the least comfortable months here.
Resumo
Illinois is a state in Estados Unidos. Illinois is a US state com capital em Springfield. Tem uma população de cerca de 12.6 million. A capital é Springfield.
Neste momento, a temperatura é de 7°C (45°F) in Illinois com céu limpo. A sensação térmica é de 5°C. Hoje as temperaturas variam de 7°C a 24°C. A probabilidade de precipitação é de 1%. As condições para passeios turísticos têm pontuação de 8.4/10 – boas condições.
A melhor época para visitar Illinois is agosto, setembro and outubro. O clima é continental. janeiro, fevereiro and dezembro costumam ser os meses menos confortáveis. julho é o mês mais quente, com máximas médias próximas de 29°C, enquanto janeiro é o mês mais frio, com mínimas próximas de -7°C.
O principal aeroporto mais próximo é O'Hare International Airport (ORD), about 284 km away. Entre os destaques próximos estão Starved Rock State Park, Lake Michigan, Gateway Arch National Park and Indiana Dunes National Park.
Em termos simples. Today is slightly warmer than average for outubro. The forecast high of 24°C is 3.4°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. running is the strongest bet in Illinois today at 9.8/10. 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 |
|---|---|
| País | Estados Unidos |
| Continente | América do Norte |
| Coordenadas | 39°46′54.1″N 89°39′0.4″W (39.7817, -89.6501) |
| Capital | Springfield |
| População | 12.600.000 |
| Area | 149.995 km² |
| Abbreviation | IL |
| Fuso horário | America/Chicago |
| Hora local | 3:22 PM (UTC-05:00) |
| Melhores meses | agosto, setembro and outubro |
| Clima | Continenteal |
Tempo 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 Estados Unidos. Its coordinates are 39.7817, -89.6501. It lies in América do Norte.
What is the weather like in Illinois agora?
It is currently 7°C (45°F) com céu limpo. Humidade is 92% and wind is 6 km/h.
When is the best time a visit Illinois?
agosto, setembro and outubro offer the most comfortable conditions in Illinois, which has a continental climate. janeiro, fevereiro and dezembro are usually the hardest months for outdoor plans.
What time zone is Illinois in?
Illinois observes America/Chicago (UTC-05:00). The hora local is 3:22 PM.
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. |
|---|---|
| Previsão and observations | Open-Meteo (ECMWF and national models). |
| Qualidade do ar 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 Tempo 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 outubro 23, 2026 at 3:22 PM hora local. Live blocks refresh every 15 minutes; climate averages monthly.
