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Weather in Bonn for September 2025

Your guide to Bonn weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Bonn is cooler than usual, with temperatures averaging 20.8 °C, this is -2.5 °C below the typical seasonal average.

  • The forecast for the next days in Bonn predicts temperatures to be around 22 °C, close to the historical average.

  • In general, the average temperature in Bonn at the beginning of September is 25.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20 °C by the end of September.

    • Rain 🌧️

  • Bonn in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 69 mm.

    • More

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

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

Average dry days
12
Dry days
Average rainy days
18
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/12°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
71 %
Avg humidity

Bonn Weather September

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

Temperatures trend during September in Bonn

See the weather trend as well as the moving average line

September weather in Bonn day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Light rain shower
Light rain shower
 23° /14° 8.6 mm 6
2 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 26° /14° 5 mm 6
3 Sept. Patchy rain possible
Patchy rain possible
 25° /15° 2 mm 5
4 Sept. Partly cloudy
Partly cloudy
 22° /14° 7.8 mm 5
5 Sept. Sunny
Sunny
 27° /13° 0.5 mm 6
6 Sept. Sunny
Sunny
 25° /13° 0.2 mm 6
7 Sept. Sunny
Sunny
 28° /13° 0 mm 7
8 Sept. Sunny
Sunny
 24° /14° 1.5 mm 6
9 Sept. Light rain shower
Light rain shower
 22° /14° 7.8 mm 6
10 Sept. Patchy rain possible
Patchy rain possible
 23° /12° 0.7 mm 5
11 Sept. Sunny
Sunny
 22° /12° 3.2 mm 6
12 Sept. Light rain shower
Light rain shower
 20° /11° 2.4 mm 4
13 Sept. Light rain shower
Light rain shower
 17° /9° 5.5 mm 4
14 Sept. Patchy rain possible
Patchy rain possible
 19° /9° 0.9 mm 5
15 Sept. Moderate rain
Moderate rain
 21° /16° 6 mm 1.1
16 Sept. Patchy rain possible
Patchy rain possible
 19° /13° 1.3 mm 0.9
17 Sept. Patchy rain possible
Patchy rain possible
 18° /11° 0.3 mm 1
18 Sept. Sunny
Sunny
 26° /13° 0 mm 1.1
19 Sept. Sunny
Sunny
 29° /13° 0 mm 1.1
20 Sept. Sunny
Sunny
 30° /15° 0 mm 6
21 Sept. Patchy rain possible
Patchy rain possible
 20° /17° 4.5 mm 4
22 Sept. Partly cloudy
Partly cloudy
 23° /15° 0 mm 5
23 Sept. Patchy rain possible
Patchy rain possible
 21° /15° 1.8 mm 4
24 Sept. Partly cloudy
Partly cloudy
 22° /13° 0.1 mm 5
25 Sept. Partly cloudy
Partly cloudy
 21° /12° 0 mm 5
26 Sept. Patchy rain possible
Patchy rain possible
 19° /13° 1.9 mm 4
27 Sept. Patchy rain possible
Patchy rain possible
 22° /15° 0.7 mm 4
28 Sept. Patchy rain possible
Patchy rain possible
 20° /14° 1.2 mm 4
29 Sept. Light rain shower
Light rain shower
 19° /10° 1.6 mm 4
30 Sept. Partly cloudy
Partly cloudy
 17° /7° 0.9 mm 4
Next
Important Notice
Our weather forecast for Bonn 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 Bonn forecast closer to your planned date for the most up-to-date weather information.
Change Month
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›

Bonn weather in September vs August vs October

Compare September weather in Bonn 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
WeatherPatchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Temperatures25°/15°22°/12°16°/9°
Rainfall141 mm69 mm94 mm
Wind12.9 km/h14 km/h14.8 km/h
Humidity72%71%78%
Rainy days23 days18 days23 days
Dry days8 days12 days8 days

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

Bonn in September - FAQ

What are the expected maximum and minimum temperatures in Bonn during September?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Bonn during September?
Moderate rainfall is anticipated in Bonn during September, with a total of 69 mm spread over approximately 18 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Bonn during September?
The average wind speed in Bonn during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Bonn in September?

As you prepare for your trip to Bonn 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 Bonn, during September, is comfortable and enjoyable, regardless of the weather conditions.

  • Clothing
    • Warm Clothing: Sweaters, hoodies, long pants
    • 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

September rainfall patterns in Bonn

Explore the daily rainfall trends and prepare for Bonns September weather 💧

UV exposure in Bonn 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 Bonn?

Get accurate weather forecasts for Bonn, located at latitude 50.734 and longitude 7.095. Stay updated with localized weather information tailored for Bonn.

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