Illinois Vejr Prognose
Illinois weather: 23°C, klart. Hver time forecast, 14-day outlook, UV, air quality and the best time og visit.
Resumé
Illinois is a state in USA. Illinois is a US state med hovedstad Springfield. Der bor omkring 12.6 million. Hovedstaden er Springfield.
Lige nu er det 23°C (73°F) in Illinois med klart. Det føles som 21°C. I dag ligger temperaturen mellem 14°C og 30°C. Sandsynligheden for nedbør er 1%. Sightseeing conditions score 9.5/10 - fremragende — tag af sted nu.
Det bedste tidspunkt at besøge Illinois is maj, august, september and oktober. Klimaet er continental. januar, februar and december tend og be the least comfortable months. juli is the warmest month med average highs near 29°C, while januar is the coldest med 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.
Kort sagt. Today is slightly warmer than average for september. The forecast high of 30°C is 3.5°C above the 27°C typical for this month. The best window og be outside is roughly 7 AM og 10 AM, when temperature, rain chance and wind line up best. stargazing is the strongest bet in Illinois today at 10/10. 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.
Active alerts for Illinois
Derived from the forecast. No official alert feed is wired for this country yet.
Vejret i Illinois lige nu
Open-Meteo Updated 11:36 PM, sep 14 local time.
Se prognosen for Illinois efter tidsinterval
Næste 24 timer
Temperatur, nedbørssandsynlighed og vind time for time.
16-day forecast for Illinois
Maks. / Min.; Nedbør; UV
| Dag | Forhold | Maks. / Min. | Nedbør | Vind | UV |
|---|---|---|---|---|---|
| man, sep 14 | ☁️ Overskyet | 30° / 14° | 1% | 20 km/h | 6 |
| tir, sep 15 | ☁️ Overskyet | 36° / 21° | 22% | 22 km/h | 6 |
| ons, sep 16 | 🌧️ Heavy drizzle | 30° / 23° | 30% · 3 mm | 16 km/h | 6 |
| tor, sep 17 | 🌦️ Støvregn | 35° / 22° | 16% · 1 mm | 13 km/h | 6 |
| fre, sep 18 | 🌦️ Light showers | 36° / 21° | 16% · 2 mm | 18 km/h | 6 |
| lør, sep 19 | ☁️ Overskyet | 38° / 25° | 20% | 20 km/h | 6 |
| søn, sep 20 | 🌧️ Heavy drizzle | 33° / 19° | 37% · 6 mm | 32 km/h | 5 |
| man, sep 21 | 🌦️ Støvregn | 19° / 15° | 16% · 5 mm | 18 km/h | 1 |
| tir, sep 22 | 🌦️ Light drizzle | 19° / 15° | 7% · 0 mm | 18 km/h | 2 |
| ons, sep 23 | ☁️ Overskyet | 22° / 11° | 14% | 22 km/h | 6 |
| tor, sep 24 | ⛅ Delvist skyet | 24° / 10° | 10% | 19 km/h | 6 |
| fre, sep 25 | ☁️ Overskyet | 24° / 12° | 10% | 15 km/h | 4 |
| lør, sep 26 | ⛅ Delvist skyet | 28° / 14° | 10% | 12 km/h | 5 |
| søn, sep 27 | ☁️ Overskyet | 29° / 15° | 13% | 11 km/h | 5 |
| man, sep 28 | 🌤️ Mest klart | 31° / 18° | 10% | 19 km/h | 5 |
| tir, sep 29 | ☁️ Overskyet | 25° / 14° | 23% | 20 km/h | 4 |
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 | ★★★☆☆ |
| marts | 15° | 4° | 90 mm | ★★★☆☆ |
| april | 19° | 9° | 135 mm | ★★★☆☆ |
| maj | 24° | 13° | 100 mm | ★★★★☆ |
| juni | 28° | 19° | 117 mm | ★★★★☆ |
| juli | 29° | 21° | 129 mm | ★★★★☆ |
| august | 29° | 20° | 58 mm | ★★★★☆ |
| september | 27° | 16° | 42 mm | ★★★★☆ |
| oktober | 20° | 10° | 37 mm | ★★★★☆ |
| november | 12° | 4° | 79 mm | ★★★☆☆ |
| december | 6° | -2° | 62 mm | ★★☆☆☆ |
Klima type: Kontinental. Kilde: Open-Meteo archive (ERA5).
Vejr map for Illinois
Animated model layers. Pick a layer og load it.
Animated layers by Vindy. For pin-level detail and nearby places, see the interactive map below.
Luftkvalitet and pollen in Illinois
Luftkvalitet: Open-Meteo (CAMS). US AQI scale.
søn, twilight and moon
Golden and blue hour are the standard photographic approximation around sunrise and sunset.
Bedste rejsetid Illinois
Go in maj, august, september and oktober. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: januar, februar and december - expect the least comfortable mix of heat, cold or rain.
Vejr by city in Illinois
1 cities mapped in this atlas
Vejr by state park in Illinois
1 state and provincial parks mapped in this atlas
Vejr by county in Illinois
1 counties mapped in this atlas
Vejr by lake in Illinois
1 lakes mapped in this atlas
Explore Illinois
Every topic we hold for this place, and the same topic for the places around it.
Vejr for related places
Frequently asked questions
Where is Illinois?
Illinois is a state in USA. Its coordinates are 39.7817, -89.6501. It lies in Nordamerika.
What is the weather like in Illinois lige nu?
It is currently 23°C (73°F) med klart. Luftfugtighed is 47% and wind is 13 km/h.
When is the best time og visit Illinois?
maj, august, september and oktober offer the most comfortable conditions in Illinois, which has a continental climate. januar, februar and december 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 11:36 PM.
How many people live in Illinois?
Illinois has a population of approximately 12.6 million.
What is the nearest airport og 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 og 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. |
|---|---|
| Prognose 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 Vejr 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 september 14, 2026 at 11:36 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
