Illinois Vær Værmelding
Illinois weather: 24°C, overskyet. Time for time forecast, 14-day outlook, UV, air quality and the best time til visit.
Snø forecast for Illinois
No snow is in the current forecast window for Illinois.
0 of the next 16 nights are forecast til reach freezing.
Historically, average lows drop below freezing in januar, februar and desember.
16-day forecast for Illinois
Maks. / Min.; Nedbør; UV
| Dag | Forhold | Maks. / Min. | Nedbør | Vind | UV |
|---|---|---|---|---|---|
| tor, okt 1 | 🌧️ Regn | 31° / 18° | 73% · 15 mm | 23 km/h | 3 |
| fre, okt 2 | 🌦️ Yr | 19° / 12° | 58% · 1 mm | 19 km/h | 5 |
| lør, okt 3 | ☁️ Overskyet | 23° / 9° | 0% | 15 km/h | 5 |
| søn, okt 4 | ⛅ Delvis skyet | 24° / 12° | 0% | 18 km/h | 5 |
| man, okt 5 | ☁️ Overskyet | 19° / 8° | 0% | 17 km/h | 5 |
| tir, okt 6 | 🌤️ Mest klart | 20° / 5° | 0% | 15 km/h | 5 |
| ons, okt 7 | ☁️ Overskyet | 26° / 10° | 3% | 18 km/h | 5 |
| tor, okt 8 | ☀️ Klar himmel | 23° / 9° | 3% | 12 km/h | 5 |
| fre, okt 9 | ⛅ Delvis skyet | 27° / 10° | 1% | 21 km/h | 5 |
| lør, okt 10 | ☁️ Overskyet | 29° / 16° | 3% | 28 km/h | 5 |
| søn, okt 11 | ☁️ Overskyet | 23° / 11° | 12% | 25 km/h | 5 |
| man, okt 12 | ☀️ Klar himmel | 23° / 8° | 15% | 14 km/h | 5 |
| tir, okt 13 | 🌤️ Mest klart | 23° / 10° | 16% | 12 km/h | 5 |
| ons, okt 14 | ☀️ Klar himmel | 28° / 12° | 16% | 28 km/h | 5 |
| tor, okt 15 | 🌤️ Mest klart | 26° / 12° | 7% | 34 km/h | 5 |
| fre, okt 16 | ☀️ Klar himmel | -- / -- | 13% | -- | — |
Klima in Illinois month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Måned | Avg high | Avg low | Regnfall | Rating |
|---|---|---|---|---|
| januar | 1° | -7° | 62 mm | ★★☆☆☆ |
| februar | 8° | -3° | 20 mm | ★★★☆☆ |
| mars | 15° | 4° | 90 mm | ★★★☆☆ |
| april | 19° | 9° | 135 mm | ★★★☆☆ |
| mai | 24° | 13° | 100 mm | ★★★★☆ |
| juni | 28° | 19° | 117 mm | ★★★★☆ |
| juli | 29° | 21° | 129 mm | ★★★★☆ |
| august | 29° | 19° | 75 mm | ★★★★☆ |
| september | 28° | 17° | 33 mm | ★★★★★ |
| oktober | 20° | 10° | 37 mm | ★★★★☆ |
| november | 12° | 4° | 79 mm | ★★★☆☆ |
| desember | 6° | -2° | 62 mm | ★★☆☆☆ |
Klima type: Kontinental. Kilde: Open-Meteo archive (ERA5).
What til pack, what til skip
- Lightweight, light-coloured clothing and a refillable water bottle
- sønglasses, a brimmed hat and SPF 30+
- Layers - the daily swing is 26°C, so mornings feel nothing like afternoons
- A packable rain shell - 2 of the next 7 days carry a real chance of rain
- Avoid exposed ridgelines, small boats and rooftop viewpoints while gusts stay above 51 km/h.
- If your dates are flexible, avoid januar, februar and desember - historically the least comfortable months here.
Se prognosen for Illinois etter tidsintervall
Illinois weather - more answers
Explore Illinois
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Frequently asked questions
Where is Illinois?
Illinois is a state in USA. Its coordinates are 39.7817, -89.6501. It lies in Nord-Amerika.
What is the weather like in Illinois akkurat nå?
It is currently 24°C (75°F) med overskyet. Luftfuktighet is 52% and wind is 10 km/h.
When is the best time til visit Illinois?
august, september and oktober offer the most comfortable conditions in Illinois, which has a continental climate. januar, februar and desember 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 8:51 AM.
How many people live in Illinois?
Illinois has a population of approximately 12.6 million.
What is the nearest airport til 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 til 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. |
|---|---|
| Værmelding and observations | Open-Meteo (ECMWF and national models). |
| Luftkvalitet and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Klima averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Vær 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 oktober 1, 2026 at 8:51 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
