Heidelberg Weather in September

September in Heidelberg sees daytime temperatures around 17°C (63°F) and lows of 7°C (45°F) at night. As the wettest month of the year, keep in mind that rainfall is at its highest.

Rainfall in Heidelberg in September

An umbrella might come in handy since it is the wettest month of the year. Historically, the month has about 10 days of rain, averaging 75 mm (3 in) in total. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in Heidelberg in September

If you're visiting Heidelberg in September, expect highs of 17°C (63°F) and overnight lows around 7°C (45°F). Conditions are often most pleasant around the middle of the day. With overnight lows of 7°C (45°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.

Sunshine in Heidelberg in September

The month experiences a moderate amount of sunlight, with 185 hours of sunshine. This provides a nice balance between sunshine and clouds.

Wind Speed in Heidelberg in September

September has wind speeds averaging 3 m/s (6 knots). You can expect comfortable light winds that steadily move flags and feel mild throughout the day. Since this is an average, daily conditions vary from gentle winds to more active breezes.

Average water temperature in September

With water at 13°C (55°F), it's on the cooler side. Keen swimmers won't be put off, but those who prefer warm water may find it less enjoyable.

September in Heidelberg has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.