Illinois Clima and Average Tiempo
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.
| Mes | Máx. media | Mín. media | Precip.itaciones | Valoración |
|---|---|---|---|---|
| enero | 1° | -7° | 62 mm | ★★☆☆☆ |
| febrero | 8° | -3° | 20 mm | ★★★☆☆ |
| marzo | 15° | 4° | 90 mm | ★★★☆☆ |
| abril | 19° | 9° | 135 mm | ★★★☆☆ |
| may | 24° | 13° | 100 mm | ★★★★☆ |
| junio | 28° | 19° | 117 mm | ★★★★☆ |
| julio | 29° | 21° | 129 mm | ★★★★☆ |
| agosto | 28° | 19° | 47 mm | ★★★★☆ |
| septiembre | 27° | 16° | 42 mm | ★★★★☆ |
| octubre | 20° | 10° | 37 mm | ★★★★☆ |
| noviembre | 12° | 4° | 79 mm | ★★★☆☆ |
| diciembre | 6° | -2° | 62 mm | ★★☆☆☆ |
Clima type: Continenteeal. Fuente: 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 | 1144 mm |
| St. Louis | 137 km | 15°C | +1°C warmer | 1144 mm |
| Missouri | 255 km | 14°C | +1°C warmer | 1002 mm |
| Indianapolis | 298 km | 13°C | 1°C cooler | 1094 mm |
| Indiana | 298 km | 13°C | 1°C cooler | 1094 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
Mejor época para visitar Illinois
Go in agosto, septiembre and octubre. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: enero, febrero and diciembre – expect the least comfortable mix of heat, cold or rain.
What this means for Illinois
Today is warmer than average for agosto. The forecast high of 33°C is 4.8°C above the 28°C typical for this month.
Lluvia 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 junio a agosto.
The gap between the warmest and coldest month averages 29°C.
What a pack, what a skip
- Lightweight, light-coloured clothing and a refillable water bottle
- dom.glasses, 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 enero, febrero and diciembre – historically the least comfortable months here.
Resumen
Illinois is a state in Estados Unidos. Illinois is a US state cuya capital es Springfield. Tiene una población de aproximadamente 12.6 million. La capital es Springfield.
Ahora mismo hay 20°C (69°F) in Illinois con despejado. La sensación térmica es de 22°C. Hoy las temperaturas van de 19°C a 33°C. La probabilidad de precipitación es del 5%. Las condiciones para hacer turismo obtienen 9.6/10 – excelente — puedes salir ahora.
La mejor época para visitar Illinois is agosto, septiembre and octubre. El clima es continental. enero, febrero and diciembre suelen ser los meses menos cómodos. julio es el mes más cálido, con máximas medias cercanas a 29°C, mientras enero es el mes más frío, con mínimas cercanas a -7°C.
El aeropuerto principal más cercano es O'Hare International Airport (ORD), about 284 km away. Entre los lugares destacados cercanos se encuentran Starved Rock State Park, Lake Michigan, Gateway Arch National Park and Indiana Dunes National Park.
En términos sencillos. Today is warmer than average for agosto. The forecast high of 33°C is 4.8°C above the 28°C typical for this month. The best window a be outside is roughly 7 AM a 10 AM, when temperature, rain chance and wind line up best. stargazing 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 |
| Continentee | América del Norte |
| Coordenadas | 39°46′54.1″N 89°39′0.4″W (39.7817, -89.6501) |
| Capital | Springfield |
| Población | 12.600.000 |
| Area | 149.995 km² |
| Abbreviation | IL |
| Zona horaria | America/Chicago |
| Hora local | 2:06 AM (UTC-05:00) |
| Mejores meses | agosto, septiembre and octubre |
| Clima | Continenteeal |
Tiempo map for Illinois
Animated model layers. Pick a layer a load it.
Animated layers by Vientoy. 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 del Norte.
What is the weather like in Illinois ahora mismo?
It is currently 20°C (69°F) con despejado. Humedad is 81% and wind is 7 km/h.
When is the best time a visit Illinois?
agosto, septiembre and octubre offer the most comfortable conditions in Illinois, which has a continental climate. enero, febrero and diciembre 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 2:06 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. |
|---|---|
| Pronóstico and observations | Open-Meteo (ECMWF and national models). |
| Calidad del aire 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 Tiempo 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 agosto 26, 2026 at 2:06 AM hora local. Live blocks refresh every 15 minutes; climate averages monthly.
