Thermograph

How unusual is the weather? Graded against ~45 years of local climate history.

Weather in Bonn in September

In an average September, Bonn sees a daily high around 19°C and a low around 11°C, based on 1980–2026 of local climate records.

Average high19°C
Typical high range14°C to 26°C
Average low11°C
Typical low range7°C to 15°C
Average daily precipitation3 mm

September records

The most extreme September on record for each metric, across 1980–2026. For rainfall, the wettest and driest are by total September accumulation.

High

Highest 34°C 2020-09-15
Lowest 10°C 2025-09-25

Low

Highest 19°C 2016-09-14
Lowest 2°C 2018-09-29

Feels-like

Highest 37°C 2020-09-15
Lowest -1°C 2022-09-30

Humidity

Highest 16.1 g/m³ 2024-09-02
Lowest 6.0 g/m³ 2002-09-24

Wind

Highest 40 km/h 1998-09-15
Lowest 3 km/h 2016-09-20

Gust

Highest 82 km/h 1998-09-14
Lowest 11 km/h 2016-09-20

Precip

Wettest 162 mm 1998
Driest 21 mm 2016

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