Cook County Vejr Prognose
Cook County weather: 17°C, regn. Hver time forecast, 14-day outlook, UV, air quality and the best time og visit.
Will it rain in Cook County?
Yes - rain is likely in Cook County today.
A 92% chance means rain is expected over most of the area. Plan indoor alternatives. Around 15 mm is forecast, which is enough og soak trails and slow traffic.
Over the next 7 days, about 26 mm of precipitation is forecast, med the wettest days falling on ons and tor.
Regnfall over the next 7 days is close og normal for september (26 mm against a typical 17 mm).
16-day forecast for Cook County
Maks. / Min.; Nedbør; UV
| Dag | Forhold | Maks. / Min. | Nedbør | Vind | UV |
|---|---|---|---|---|---|
| ons, sep 30 | 🌧️ Regn | 18° / 15° | 92% · 15 mm | 19 km/h | 2 |
| tor, okt 1 | 🌧️ Regn | 22° / 17° | 71% · 12 mm | 20 km/h | 1 |
| fre, okt 2 | ☁️ Overskyet | 15° / 13° | 35% | 21 km/h | 5 |
| lør, okt 3 | ⛅ Delvist skyet | 18° / 13° | 1% | 17 km/h | 5 |
| søn, okt 4 | ☁️ Overskyet | 21° / 13° | 1% | 19 km/h | 5 |
| man, okt 5 | ☀️ Klar himmel | 15° / 12° | 1% | 20 km/h | 5 |
| tir, okt 6 | 🌤️ Mest klart | 18° / 9° | 0% | 15 km/h | 5 |
| ons, okt 7 | 🌦️ Light drizzle | 21° / 12° | 6% · 1 mm | 19 km/h | 4 |
| tor, okt 8 | ⛅ Delvist skyet | 22° / 12° | 4% | 10 km/h | 5 |
| fre, okt 9 | ☁️ Overskyet | 22° / 14° | 4% | 16 km/h | 4 |
| lør, okt 10 | ☀️ Klar himmel | 27° / 17° | 7% | 20 km/h | 5 |
| søn, okt 11 | 🌦️ Støvregn | 22° / 17° | 15% · 1 mm | 20 km/h | 3 |
| man, okt 12 | 🌦️ Støvregn | 16° / 12° | 19% · 4 mm | 32 km/h | 1 |
| tir, okt 13 | 🌦️ Light drizzle | 16° / 11° | 19% · 0 mm | 12 km/h | 4 |
| ons, okt 14 | ☁️ Overskyet | 20° / 10° | 19% | 11 km/h | 4 |
| tor, okt 15 | 🌦️ Light showers | 16° / 6° | 12% · 29 mm | 35 km/h | 1 |
What this means for Cook County
Today is cooler than average for september. The forecast high of 18°C is 5.9°C below the 24°C typical for this month.
A 92% chance means rain is expected over most of the area. Plan indoor alternatives. Around 15 mm is forecast, which is enough og soak trails and slow traffic.
Wet roads are likely; braking distances roughly double in heavy rain.
Northern Hemisphere, so peak summer falls in juni og august.
The gap between the warmest and coldest month averages 29°C.
What og pack, what og skip
- Layers - the daily swing is 13°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 januar, februar and december - historically the least comfortable months here.
Se prognosen for Cook County efter tidsinterval
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Frequently asked questions
Where is Cook County?
Cook County is a county in Illinois. Its coordinates are 41.8781, -87.6298. It lies in Nordamerika.
What is the weather like in Cook County lige nu?
It is currently 17°C (62°F) med regn. Luftfugtighed is 92% and wind is 16 km/h.
When is the best time og visit Cook County?
maj, juni, august, september and oktober offer the most comfortable conditions in Cook County, which has a continental climate. januar, februar and december are usually the hardest months for outdoor plans.
What time zone is Cook County in?
Cook County observes America/Chicago (UTC-05:00). The local time is 9:15 PM.
How many people live in Cook County?
Cook County has a population of approximately 5.1 million.
What is the nearest airport og Cook County?
The closest airports are O'Hare International Airport (ORD), 25 km away.
What are the top things og do in Cook County?
Popular options include Indiana Dunes National Park, Starved Rock State Park and Lake Michigan.
Related articles
Data sources and methodology
| Place data | USPOTUS Atlas dataset (us-counties) - 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 30, 2026 at 9:15 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
