The weather in Bielefeld is typical for East Westphalia-Lippe: temperate and changeable. An hourly forecast is helpful for planning a trip to Sparrenburg Castle or a hike in the Teutoburg Forest without being surprised by a shower.
Mornings are often cool, with a mix of clouds and sun. The hourly forecast helps you decide if you need a rain jacket for your commute to university or work.
The afternoons are pleasantly warm but rarely hot. The probability of short rain showers is always present. A look at the forecast is advisable before you set out for a long shopping trip in the old town.
The evenings cool down noticeably. An extra layer of clothing is recommended for a visit to one of the many festivals like the Leinewebermarkt. The nights are usually calm.