Illinois 天気 予報
Illinois weather: 27°C, ほぼ晴れ. 時間別 forecast, 14-day outlook, UV, air quality and the best timeからvisit.
14-day forecast for Illinois
最高 / 最低; 降水; UV
| 日 | 状況 | 最高 / 最低 | 降水 | 風 | UV |
|---|---|---|---|---|---|
| 水, 9月 30 | ☁️ 曇り | 33° / 19° | 18% | 17 km/h | 3 |
| 木, 10月 1 | 🌦️ 弱い雨 | 29° / 17° | 88% · 4 mm | 23 km/h | 3 |
| 金, 10月 2 | ☁️ 曇り | 22° / 13° | 88% · 1 mm | 23 km/h | 5 |
| 土, 10月 3 | ☀️ 快晴 | 24° / 10° | 1% | 13 km/h | 5 |
| 日, 10月 4 | ☁️ 曇り | 25° / 13° | 1% | 22 km/h | 5 |
| 月, 10月 5 | ☁️ 曇り | 20° / 9° | 0% | 16 km/h | 5 |
| 火, 10月 6 | 🌤️ ほぼ晴れ | 19° / 5° | 0% | 15 km/h | 5 |
| 水, 10月 7 | ☁️ 曇り | 24° / 9° | 4% | 21 km/h | 4 |
| 木, 10月 8 | ☁️ 曇り | 24° / 10° | 2% | 14 km/h | 5 |
| 金, 10月 9 | ☁️ 曇り | 24° / 10° | 0% | 17 km/h | 5 |
| 土, 10月 10 | ☀️ 快晴 | 26° / 10° | 3% | 13 km/h | 5 |
| 日, 10月 11 | ☀️ 快晴 | 29° / 14° | 6% | 15 km/h | 5 |
| 月, 10月 12 | ☁️ 曇り | 28° / 15° | 9% | 10 km/h | 5 |
| 火, 10月 13 | ☀️ 快晴 | 29° / 16° | 10% | 7 km/h | 5 |
The two-week trend
Warming. The second half of the window averages 3°C warmer than the days immediately ahead.
The window averages 26°C against a 9月 normal of 28°C - 2°C below.
雨fall over the next 7 days is closeからnormal for 9月 (6 mm against a typical 8 mm).
What this means for Illinois
Today is warmer than average for 9月. The forecast high of 33°C is 5.1°C above the 28°C typical for this month.
A 18% 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 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+
- Layers - the daily swing is 28°C, so mornings feel nothing like afternoons
- A packable rain shell - 2 of the next 7 days carry a real chance of rain
- If your dates are flexible, avoid 1月, 2月 and 12月 - historically the least comfortable months here.
時間帯別のIllinois 予報を見る
Illinois weather - more answers
Explore Illinois
Every topic we hold for this place, and the same topic for the places around it.
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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 27°C (80°F)、ほぼ晴れ. 湿度 is 40% and wind is 10 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 3:09 PM.
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 9月 30, 2026 at 3:09 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
