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Germany weather

Weather in Heidelberg for September 2025

Your guide to Heidelberg weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Heidelberg is cooler than usual, with temperatures averaging 21.8 °C, this is -2.8 °C below the typical seasonal average.

  • Expect cooler weather in the next days in Heidelberg with the forecast suggesting a temperature of 22.7 °C, lower than the historical average.

  • In general, the average temperature in Heidelberg at the beginning of September is 26.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.9 °C by the end of September.

    • Rain 🌧️

  • With an average of 4 rainy days, Heidelberg experiences minimal rainfall in September.

    • More

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

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
26
Dry days
Average rainy days
4
Rainy days
Average snowy days
0
Snow days
Average temperatures
27°/12°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
64 %
Avg humidity

Heidelberg Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Patchy rain possible
26°
2
Partly cloudy
26°
3
Partly cloudy
27°
4
Light rain shower
25°
5
Sunny
26°
6
Sunny
25°
7
Sunny
28°
8
Sunny
26°
9
Light rain shower
22°
10
Patchy rain possible
24°
11
Cloudy
23°
12
Patchy rain possible
23°
13
Overcast
20°
14
Cloudy
20°
15
Moderate rain
21°
16
Patchy rain possible
17°
17
Patchy rain possible
19°
18
Sunny
24°
19
Sunny
27°
20
Sunny
28°
21
Patchy rain possible
27°
22
Patchy rain possible
25°
23
Patchy rain possible
24°
24
Sunny
22°
25
Partly cloudy
23°
26
Patchy rain possible
21°
27
Partly cloudy
21°
28
Patchy rain possible
19°
29
Overcast
21°
30
Partly cloudy
19°

Temperatures trend during September in Heidelberg

See the weather trend as well as the moving average line

September weather in Heidelberg day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Patchy rain possible
Patchy rain possible
 26° /16° 4.3 mm 6
2 Sept. Partly cloudy
Partly cloudy
 26° /16° 1 mm 6
3 Sept. Partly cloudy
Partly cloudy
 27° /17° 0.7 mm 7
4 Sept. Light rain shower
Light rain shower
 25° /16° 5.5 mm 6
5 Sept. Sunny
Sunny
 26° /15° 2.7 mm 6
6 Sept. Sunny
Sunny
 25° /14° 3.2 mm 6
7 Sept. Sunny
Sunny
 28° /15° 0 mm 7
8 Sept. Sunny
Sunny
 26° /15° 1.2 mm 6
9 Sept. Light rain shower
Light rain shower
 22° /15° 13.4 mm 5
10 Sept. Patchy rain possible
Patchy rain possible
 24° /15° 0.7 mm 6
11 Sept. Cloudy
Cloudy
 23° /14° 2.5 mm 5
12 Sept. Patchy rain possible
Patchy rain possible
 23° /12° 1.8 mm 5
13 Sept. Overcast
Overcast
 20° /12° 0.4 mm 5
14 Sept. Cloudy
Cloudy
 20° /13° 1.8 mm 5
15 Sept. Moderate rain
Moderate rain
 21° /16° 5.6 mm 0.8
16 Sept. Patchy rain possible
Patchy rain possible
 17° /12° 1 mm 0.8
17 Sept. Patchy rain possible
Patchy rain possible
 19° /10° 0.1 mm 1
18 Sept. Sunny
Sunny
 24° /12° 0 mm 1.2
19 Sept. Sunny
Sunny
 27° /14° 0 mm 1.2
20 Sept. Sunny
Sunny
 28° /17° 0 mm 6
21 Sept. Patchy rain possible
Patchy rain possible
 27° /18° 0.2 mm 5
22 Sept. Patchy rain possible
Patchy rain possible
 25° /17° 0.2 mm 5
23 Sept. Patchy rain possible
Patchy rain possible
 24° /14° 1.5 mm 4
24 Sept. Sunny
Sunny
 22° /13° 0 mm 5
25 Sept. Partly cloudy
Partly cloudy
 23° /14° 0 mm 5
26 Sept. Patchy rain possible
Patchy rain possible
 21° /15° 0.6 mm 4
27 Sept. Partly cloudy
Partly cloudy
 21° /13° 0 mm 5
28 Sept. Patchy rain possible
Patchy rain possible
 19° /13° 3.8 mm 4
29 Sept. Overcast
Overcast
 21° /12° 0 mm 6
30 Sept. Partly cloudy
Partly cloudy
 19° /11° 1.1 mm 5
Next
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.
Change Month
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Heidelberg weather in September vs August vs October

Compare September weather in Heidelberg with the previous and following months. See how temperature, rainfall, wind, and other conditions change throughout the year to help you plan your visit.
AugustSeptemberOctober
WeatherSunny
Sunny
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Temperatures31°/15°27°/12°20°/9°
Rainfall234 mm110 mm113 mm
Wind13 km/h14.2 km/h13.5 km/h
Humidity61%64%71%
Rainy days13 days4 days5 days
Dry days18 days26 days26 days

Planning a trip to Heidelberg? Discover the best time to visit

Heidelberg in September - FAQ

What are the expected maximum and minimum temperatures in Heidelberg during September?
Enjoy moderate daytime temperatures of up to 27° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Heidelberg during September?
Significant rainfall exceeding 110.1 mm is expected in Heidelberg during September, occurring over more than 4 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Heidelberg during September?
The average wind speed in Heidelberg during September is 14 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 ☀️

Quick links

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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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