When to go · Heilbronn
Heilbronn in September
Great month. Inside Heilbronn's best window: May–Oct.
Key facts
- Verdict
- Great
- Temperature
- 23°C (73°F)73°F (23°C) / 14°C (57°F)57°F (14°C)
- average high / low
- Rain days
- 8
- Crowds
- Medium
- Germany overall
- Prices
- High
- Germany overall
Verdict
Inside Heilbronn's best window: May–Oct.
Is another month better than September?
No other month rates higher than September for Heilbronn in this guide.
Weather in September
- HeilbronnHighs around 23 °C (73 °F), lows around 14 °C (57 °F), rain on about 8 daysHighs around 73 °F (23 °C), lows around 57 °F (14 °C), rain on about 8 days
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 Heilbronn, side by side.
Verdict
Sep: Great
May: Great
Daytime high
Sep: 23 °C (73 °F)73 °F (23 °C)
May: 21 °C (70 °F)70 °F (21 °C)
Night low
Sep: 14 °C (57 °F)57 °F (14 °C)
May: 12 °C (54 °F)54 °F (12 °C)
Rain days
Sep: 8 (better)
May: 9
Crowds
Sep: Medium
May: Medium
Prices
Sep: High
May: Medium
Festivals listed
Sep: 1
May: 0
September: Inside Heilbronn's best window: May–Oct.
May: Inside Heilbronn's best window: May–Oct.
Heilbronn: figures are long-term averages from this guide, not a forecast.
What to pack
Nothing unusual for the weather this month.