Heidelberg
September
Weather in Heidelberg for September 2025
Your guide to Heidelberg weather in September - trends and predictions
In general, the average temperature in Heidelberg at the beginning of September is 27.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.9 °C by the end of September.
Heidelberg sees moderate rainfall in September, averaging 7 rainy days.
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23
Dry days
7
Rainy days
0
Snow days
26°/13°
Temperatures
13 km/h
Avg max wind
62 %
Avg humidity
Heidelberg in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  27° | 2  28° | 3 28° | 4  26° | 5 28° | 6 26° | 7 29° |
| 8 27° | 9 25° | 10 26° | 11  24° | 12  23° | 13  19° | 14 20° |
| 15 23° | 16 21° | 17 25° | 18 25° | 19 23° | 20 25° | 21 26° |
| 22 22° | 23 20° | 24 21° | 25 21° | 26 21° | 27 22° | 28 21° |
| 29 21° | 30 19° |
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Temperatures trend during September in Heidelberg
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Light rain shower | 27° /16° | 6.3 mm | 6 | |
| 2 Sept. | Partly cloudy | 28° /17° | 1 mm | 7 | |
| 3 Sept. | Partly cloudy | 28° /18° | 0.8 mm | 8 | |
| 4 Sept. | Sunny | 26° /17° | 1.2 mm | 6 | |
| 5 Sept. | Sunny | 28° /17° | 2.4 mm | 7 | |
| 6 Sept. | Sunny | 26° /15° | 4.7 mm | 6 | |
| 7 Sept. | Sunny | 29° /16° | 0 mm | 7 | |
| 8 Sept. | Sunny | 27° /16° | 0.9 mm | 7 | |
| 9 Sept. | Sunny | 25° /16° | 5.4 mm | 6 | |
| 10 Sept. | Sunny | 26° /16° | 0.9 mm | 7 | |
| 11 Sept. | Cloudy | 24° /14° | 3.1 mm | 6 | |
| 12 Sept. | Thundery outbreaks possible | 23° /12° | 2 mm | 6 | |
| 13 Sept. | Overcast | 19° /12° | 0.2 mm | 5 | |
| 14 Sept. | Cloudy | 20° /13° | 0 mm | 5 | |
| 15 Sept. | Partly cloudy | 23° /11° | 0 mm | 6 | |
| 16 Sept. | Patchy rain possible | 21° /13° | 0.2 mm | 5 | |
| 17 Sept. | Sunny | 25° /14° | 0.7 mm | 6 | |
| 18 Sept. | Light rain shower | 25° /15° | 1.6 mm | 6 | |
| 19 Sept. | Patchy rain possible | 23° /15° | 0.2 mm | 5 | |
| 20 Sept. | Partly cloudy | 25° /13° | 0 mm | 7 | |
| 21 Sept. | Patchy rain possible | 26° /14° | 2.4 mm | 6 | |
| 22 Sept. | Light rain shower | 22° /13° | 1.8 mm | 5 | |
| 23 Sept. | Patchy rain possible | 20° /11° | 3.8 mm | 5 | |
| 24 Sept. | Sunny | 21° /12° | 0.3 mm | 6 | |
| 25 Sept. | Sunny | 21° /11° | 0.3 mm | 6 | |
| 26 Sept. | Sunny | 21° /13° | 11.2 mm | 5 | |
| 27 Sept. | Overcast | 22° /12° | 0.2 mm | 5 | |
| 28 Sept. | Partly cloudy | 21° /12° | 2.1 mm | 6 | |
| 29 Sept. | Overcast | 21° /12° | 0 mm | 6 | |
| 30 Sept. | Partly cloudy | 19° /11° | 1.1 mm | 5 | |
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Important Notice
Our weather forecast for Heidelberg in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Heidelberg forecast closer to your planned date for the most up-to-date weather information.
Heidelberg in September - FAQ
What are the expected maximum and minimum temperatures in Heidelberg during September?
Enjoy moderate daytime temperatures of up to 26° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Heidelberg during September?
Moderate rainfall is anticipated in Heidelberg during September, with a total of 71.7 mm spread over approximately 7 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Heidelberg during September?
The average wind speed in Heidelberg during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Heidelberg in September?
As you prepare for your trip to Heidelberg in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Heidelberg, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Lightweight Clothing: T-shirts, blouses, shorts, skirts
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Scarves: To protect you from the cold wind
- Gloves/Mittens: Essential for cold weather
- Warm Hats: Warm hats for insulation in cold weather
- Umbrellas/Raincoats: For rainy days
- Personal Items
- Sunscreen: High SPF for sunny destinations
- Lip Balm with SPF: To protect against chapped lips
September rainfall patterns in Heidelberg
Explore the daily rainfall trends and prepare for Heidelbergs September weather 💧
UV exposure in Heidelberg during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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