Live decision for Hamburg. Updated every 30 minutes.
Locating you…
—
Today's windows
Updated: — ·
Enter your city or postcode
—
Hamburg is Germany's second-largest city and its major port, sitting on the Elbe near the North Sea. Its maritime climate is the most pronounced in Germany: high winds, frequent rain (about 180 rainy days per year), and persistent humidity. The North Sea proximity protects Hamburg from the inland heat extremes that have hit other German cities — July averages a comfortable 22°C.
Hamburg's air quality has a split personality. The port area (HafenCity, Wilhelmsburg) sees elevated ship exhaust emissions — the city's most persistent air quality challenge. Central and residential areas have clean air (AQI 20–35), with genuine green lung effects around the Alster lakes and Stadtpark on their surrounding neighbourhoods.
Winter ventilation in Hamburg requires judgment: the combination of high humidity and cold temperature (averaging 2–4°C in January) means incoming air carries substantial moisture. Short burst ventilation is preferable to extended window opening — the same Stoßlüften discipline that applies across all northern German cities.
In Hamburg, the best ventilation times are typically early morning (5–8 AM) and late evening (after sunset) when outdoor temperatures drop below indoor levels.
Yes, in most weather conditions. Open windows can drop indoor temperature by 2–5°C in 30 minutes if outdoor air is cooler. Check the live recommendation above for tonight.
Above 80% humidity, opening windows can make indoor air feel sticky. Combine with dehumidifier or wait for drier hours.