When to go · Heidelberg
Heidelberg in September
Great month. Inside Heidelberg's best window: Apr–Oct; May, June and September are the sweet spot.
Key facts
- Verdict
- Great
- Temperature
- 22°C (72°F)72°F (22°C) / 11°C (52°F)52°F (11°C)
- average high / low
- Rain days
- 9
- Crowds
- Medium
- Germany overall
- Prices
- High
- Germany overall
Verdict
Inside Heidelberg's best window: Apr–Oct; May, June and September are the sweet spot.
Is another month better than September?
No other month rates higher than September for Heidelberg in this guide.
Weather in September
- HeidelbergHighs around 22 °C (72 °F), lows around 11 °C (52 °F), rain on about 9 daysHighs around 72 °F (22 °C), lows around 52 °F (11 °C), rain on about 9 days
- Rhine and the west, Germany · Cologne, Frankfurt, Rhine and Moselle valleys, Heidelbergbest weather
Mildest winters; wine harvest and river trips at their best in September–October.
Festivals and holidays
Dates as our data lists them. Moving holidays (lunar and Islamic calendars, Easter) shift every year: check the date for your year before you build a trip on it.
Oktoberfest (Munich) big impact
Mid Sep – early Oct (19 Sep – 4 Oct 2026) · Germany
Munich hotels triple in price; trains from Munich crowded in the evenings.
Crowds and prices
- Crowds · Germany overall
- Medium
- Prices · Germany overall
- High
Germany overall: Best all-round month; Oktoberfest starts in the second half and Munich prices triple.
High-price month: see what to book ahead.
Compare two months
Weather, crowds and prices for any two months in Heidelberg, side by side.
Verdict
Sep: Great
Apr: Great
Daytime high
Sep: 22 °C (72 °F)72 °F (22 °C)
Apr: 17 °C (63 °F)63 °F (17 °C)
Night low
Sep: 11 °C (52 °F)52 °F (11 °C)
Apr: 5 °C (41 °F)41 °F (5 °C)
Rain days
Sep: 9 (better)
Apr: 10
Crowds
Sep: Medium
Apr: Medium
Prices
Sep: High
Apr: Medium
Festivals listed
Sep: 1
Apr: 0
September: Inside Heidelberg's best window: Apr–Oct; May, June and September are the sweet spot.
April: Inside Heidelberg's best window: Apr–Oct; May, June and September are the sweet spot.
Heidelberg: figures are long-term averages from this guide, not a forecast.
What to pack
- A warm layer for the evenings