The weather in Gelsenkirchen is typical for the Ruhr area: unassuming and often gray, but with sunny moments. An hourly forecast is practical to know whether you need a rain jacket for the way to the Veltins-Arena or not.
Mornings are usually cool and cloudy. It's worth checking the hourly forecast to see if the clouds will clear, making a visit to the Nordsternpark possible.
The afternoons are moderately warm. Sunny spells are perfect for a trip to the ZOOM Erlebniswelt zoo. A brief shower is always possible in the Ruhr area, so stay informed with the hourly forecast.
Evenings are mild. A light jacket is usually sufficient for attending one of the many events or for a cozy evening in one of the district centers.