Heidelberg Weather in September
Thinking of visiting Heidelberg in September? Expect pleasant temperatures reaching 21°C (70°F) during the day, dropping to 11°C (52°F) at night, and note that quite a bit of rainfall is likely.
Rainfall in Heidelberg in September
Analyzing past climate data, one can expect approximately 12 days of rain, averaging 69 mm (2.7 in). Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.
Temperature in Heidelberg in September
September is a good time to be in Heidelberg. Days are perfect, reaching 21°C (70°F), with nights around 11°C (52°F). Even when the weather is stable, mornings and evenings can still feel distinctly cool. At 11°C (52°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.
Sunshine in Heidelberg in September
The area enjoys a balanced 166 hours of sunlight, ensuring it's neither too overcast nor too sunny.So this is a great month to visit if you prefer dry days with pleasant temperatures.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Germany, check out our Heidelberg's climate page.
Heidelberg Temperature in September
Min Temperature
11°C (52°F)
Max Temperature
21°C (70°F)
Chance of Rain
40%
Precipitation
69 mm (2.7 in)
Rainy days
12 days
Sunshine
166 hours *
Percentage Sunshine
*
Daily Historical Temperatures
48-year average (1976-2025)
Based on our historical records, temperatures in Heidelberg typically drop from around 23°C (73°F) at the start of September to approximately 19°C (66°F) by the end. Nights are cool, with lows typically ranging from 9°C (48°F) to 14°C (57°F).
Average temperatures in September
Historical weather for Heidelberg in September
Browse day-by-day weather records for Heidelberg spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Heidelberg historical weather extremes in September
The extremes listed below come from historical weather data collected in Heidelberg from 2005 through 2025.
- The warmest day in September was on September 13, 2016, with a maximum of 32°C (90°F).
- Heidelberg experienced its chilliest September day on September 26, 2020, reaching only 10°C (50°F).
- The lowest overnight temperature recorded in September was 3°C (37°F) (September 26, 2018).
Best Places in Germany in September
Find out more about the weather in Germany and which places have the best travel conditions in this month. See all of Germany in September →
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unpleasant
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What to Wear in Heidelberg in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Heidelberg in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Germany, check out our Heidelberg's climate page.
See the full Heidelberg climate overview or explore weather in Germany.
