Illinois الطقس التوقعات
Illinois weather: 13°C, صافٍ. كل ساعة forecast, 14-day outlook, UV, air quality and the best time و visit.
Illinois weather in ديسمبر
One of the harder months here - go in مع a plan.
ديسمبر runs 11°C cooler than the annual average in Illinois.
الطقس map for Illinois
Animated model layers. Pick a layer و load it.
Animated layers by الرياحy. For pin-level detail and nearby places, see the interactive map below.
المناخ in Illinois month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| الشهر | Avg high | Avg low | مطرfall | Rating |
|---|---|---|---|---|
| يناير | 1° | -7° | 62 mm | ★★☆☆☆ |
| فبراير | 8° | -3° | 20 mm | ★★★☆☆ |
| مارس | 15° | 4° | 90 mm | ★★★☆☆ |
| أبريل | 19° | 9° | 135 mm | ★★★☆☆ |
| ماي | 24° | 13° | 100 mm | ★★★★☆ |
| يونيو | 28° | 19° | 117 mm | ★★★★☆ |
| يوليو | 29° | 21° | 129 mm | ★★★★☆ |
| أغسطس | 29° | 19° | 75 mm | ★★★★☆ |
| سبتمبر | 28° | 17° | 33 mm | ★★★★★ |
| أكتوبر | 20° | 10° | 37 mm | ★★★★☆ |
| نوفمبر | 12° | 4° | 79 mm | ★★★☆☆ |
| ديسمبر | 6° | -2° | 62 mm | ★★☆☆☆ |
المناخ type: القارةal. المصدر: Open-Meteo archive (ERA5).
أفضل وقت للزيارة Illinois
Go in أغسطس, سبتمبر and أكتوبر. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: يناير, فبراير and ديسمبر - expect the least comfortable mix of heat, cold or rain.
What و pack, what و skip
- الأحدglasses, a brimmed hat and SPF 30+
- Layers - the daily swing is 18°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 يناير, فبراير and ديسمبر - historically the least comfortable months here.
How Illinois compares مع 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 | 1163 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 |
شاهد توقعات Illinois حسب الفترة الزمنية
Illinois weather - more answers
Explore Illinois
Every topic we hold for this place, and the same topic for the places around it.
الطقس for related places
Frequently asked questions
Where is Illinois?
Illinois is a state in الولايات المتحدة. Its coordinates are 39.7817, -89.6501. It lies in أمريكا الشمالية.
What is the weather like in Illinois الآن?
It is currently 13°C (56°F) مع صافٍ. الرطوبة is 70% and wind is 8 km/h.
When is the best time و visit Illinois?
أغسطس, سبتمبر and أكتوبر offer the most comfortable conditions in Illinois, which has a continental climate. يناير, فبراير and ديسمبر 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 2:34 AM.
How many people live in Illinois?
Illinois has a population of approximately 12.6 million.
What is the nearest airport و 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 و 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. |
|---|---|
| التوقعات and observations | Open-Meteo (ECMWF and national models). |
| جودة الهواء and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| المناخ averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National الطقس 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 أكتوبر 28, 2026 at 2:34 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
