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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.

  • Is September a good time to visit Heidelberg? check out the best time to travel to Heidelberg page.

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Average dry days
23
Dry days
Average rainy days
7
Rainy days
Average snowy days
0
Snow days
Average temperatures
26°/13°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
62 %
Avg humidity

Heidelberg in September average weather

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Temperatures trend during September in Heidelberg

See the weather trend as well as the moving average line
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September weather day by day

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Date Weather Temperatures Rain UV More
1 Sept. Light rain shower
Light rain shower
27° /16° 6.3 mm 6
2 Sept. Partly cloudy
Partly cloudy
28° /17° 1 mm 7
3 Sept. Partly cloudy
Partly cloudy
28° /18° 0.8 mm 8
4 Sept. Sunny
Sunny
26° /17° 1.2 mm 6
5 Sept. Sunny
Sunny
28° /17° 2.4 mm 7
6 Sept. Sunny
Sunny
26° /15° 4.7 mm 6
7 Sept. Sunny
Sunny
29° /16° 0 mm 7
8 Sept. Sunny
Sunny
27° /16° 0.9 mm 7
9 Sept. Sunny
Sunny
25° /16° 5.4 mm 6
10 Sept. Sunny
Sunny
26° /16° 0.9 mm 7
11 Sept. Cloudy
Cloudy
24° /14° 3.1 mm 6
12 Sept. Thundery outbreaks possible
Thundery outbreaks possible
23° /12° 2 mm 6
13 Sept. Overcast
Overcast
19° /12° 0.2 mm 5
14 Sept. Cloudy
Cloudy
20° /13° 0 mm 5
15 Sept. Partly cloudy
Partly cloudy
23° /11° 0 mm 6
16 Sept. Patchy rain possible
Patchy rain possible
21° /13° 0.2 mm 5
17 Sept. Sunny
Sunny
25° /14° 0.7 mm 6
18 Sept. Light rain shower
Light rain shower
25° /15° 1.6 mm 6
19 Sept. Patchy rain possible
Patchy rain possible
23° /15° 0.2 mm 5
20 Sept. Partly cloudy
Partly cloudy
25° /13° 0 mm 7
21 Sept. Patchy rain possible
Patchy rain possible
26° /14° 2.4 mm 6
22 Sept. Light rain shower
Light rain shower
22° /13° 1.8 mm 5
23 Sept. Patchy rain possible
Patchy rain possible
20° /11° 3.8 mm 5
24 Sept. Sunny
Sunny
21° /12° 0.3 mm 6
25 Sept. Sunny
Sunny
21° /11° 0.3 mm 6
26 Sept. Sunny
Sunny
21° /13° 11.2 mm 5
27 Sept. Overcast
Overcast
22° /12° 0.2 mm 5
28 Sept. Partly cloudy
Partly cloudy
21° /12° 2.1 mm 6
29 Sept. Overcast
Overcast
21° /12° 0 mm 6
30 Sept. Partly cloudy
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

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Location coordinates Where is Heidelberg?

Get accurate weather forecasts for Heidelberg, located at latitude 49.408 and longitude 8.691. Stay updated with localized weather information tailored for Heidelberg.

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