Illinois 気候 and Average 天気
気候 of Illinois: average temperatures, rainfall and seasons month by month.
気候 in Illinois month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| 月 | Avg high | Avg low | 雨fall | Rating |
|---|---|---|---|---|
| 1月 | 1° | -7° | 62 mm | ★★☆☆☆ |
| 2月 | 8° | -3° | 20 mm | ★★★☆☆ |
| 3月 | 15° | 4° | 90 mm | ★★★☆☆ |
| 4月 | 19° | 9° | 135 mm | ★★★☆☆ |
| 5月 | 24° | 13° | 100 mm | ★★★★☆ |
| 6月 | 28° | 19° | 117 mm | ★★★★☆ |
| 7月 | 29° | 21° | 129 mm | ★★★★☆ |
| 8月 | 28° | 19° | 47 mm | ★★★★☆ |
| 9月 | 27° | 16° | 42 mm | ★★★★☆ |
| 10月 | 20° | 10° | 37 mm | ★★★★☆ |
| 11月 | 12° | 4° | 79 mm | ★★★☆☆ |
| 12月 | 6° | -2° | 62 mm | ★★☆☆☆ |
気候 type: 大陸al. 出典： Open-Meteo archive (ERA5).
Recent extremes in Illinois
高いest and lowest readings observed in the last 3 years of reanalysis data - not all-time records.
How Illinois compares、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 |
気候 by city in Illinois
1 cities mapped in this atlas
気候 by state park in Illinois
1 state and provincial parks mapped in this atlas
気候 by county in Illinois
1 counties mapped in this atlas
気候 by lake in Illinois
1 lakes mapped in this atlas
訪問に最適な時期 Illinois
Go in 8月, 9月 and 10月. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: 1月, 2月 and 12月 - expect the least comfortable mix of heat, cold or rain.
What this means for Illinois
Today is about average for 8月. The forecast high of 29°C is in line、the 28°C typical for this month.
A 34% chance means rain is likely somewhere nearby at some point - carry a layer, but do not cancel.
No weather-related travel disruption is expected today. Roads and airports should run normally.
Northern Hemisphere, so peak summer falls in 6月から8月.
The gap between the warmest and coldest month averages 29°C.
Whatからpack, whatからskip
- Lightweight, light-coloured clothing and a refillable water bottle
- 日glasses, a brimmed hat and SPF 30+
- If your dates are flexible, avoid 1月, 2月 and 12月 - historically the least comfortable months here.
概要
Illinois is a state in アメリカ合衆国. Illinois is a US state首都をSpringfield. 人口は約12.6 million. 首都はSpringfield.
現在の気温は22°C (71°F) in Illinois、晴れ. 体感温度は24°C. 今日の気温は19°Cから29°C. 降水確率は34%. Sightseeing conditions score 8.9/10 - 絶好 — 今すぐ出かけられます.
訪問に最適な時期はIllinois is 8月, 9月 and 10月. 気候はcontinental. 1月, 2月 and 12月 tendからbe the least comfortable months. 7月 is the warmest month、average highs near 29°C, while 1月 is the coldest、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.
簡単に言うと。 Today is about average for 8月. The forecast high of 29°C is in line、the 28°C typical for this month. The best windowからbe outside is roughly 8 AMから11 AM, when temperature, rain chance and wind line up best. sightseeing is the strongest bet in Illinois today at 8.9/10. 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
天気 map for Illinois
Animated model layers. Pick a layerからload it.
Animated layers by 風y. 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.
気候 for related places
Frequently asked questions
Where is Illinois?
Illinois is a state in アメリカ合衆国. Its coordinates are 39.7817, -89.6501. It lies in 北アメリカ.
What is the weather like in Illinois現在?
It is currently 22°C (71°F)、晴れ. 湿度 is 75% and wind is 6 km/h.
When is the best timeからvisit Illinois?
8月, 9月 and 10月 offer the most comfortable conditions in Illinois, which has a continental climate. 1月, 2月 and 12月 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 5:39 AM.
How many people live in Illinois?
Illinois has a population of approximately 12.6 million.
What is the nearest airportから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から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. |
|---|---|
| 予報 and observations | Open-Meteo (ECMWF and national models). |
| 大気質 and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| 気候 averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National 天気 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 8月 23, 2026 at 5:39 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
