What September feels like in Frankfurt
In Frankfurt, September brings early autumn. Afternoons are mild and comfortable for most people in light layers. Once the sun goes down the air changes: nights are cool. The air is fairly humid, though at these temperatures it rarely feels oppressive.
Rain in Frankfurt in September
Expect a mix of dry and wet days, with rain about one day in 3. Each rainy day adds about 5.9 mm (0.2 in), a proper wetting rather than a sprinkle. That is close to Frankfurt's typical rain per wet day for the whole year (about 5.4 mm).
Daylight and sunshine in September
On 15 September the sun rises at about 6:59 am and sets around 7:42 pm local time, giving 12 h 43 min of daylight. Days are getting shorter: 1 h 51 min less daylight than in mid-August. Measured sunshine covers about 71% of the daylight — there are plenty of bright spells.
How September compares to the rest of the year
September is the 4th warmest month of the year in Frankfurt. Against August, the average high is 4.1°C (7.4°F) lower, with 13 mm less rain. October is cooler again. By October, typical highs are 15.1°C (59.2°F).
Who September suits
- Sightseeing: a good fit — comfortable enough to explore on foot all day.
- Parks & outdoor: a good fit — comfortable for long walks and picnics.
Tips for visiting Frankfurt in September
Versatile Layers
Days are noticeably warmer than nights — layers you can add or remove.
Rain Protection
A compact umbrella and a light waterproof jacket.
Sunglasses
Frequent sunshine — sunglasses and a light hat.
Quick questions
How warm is Frankfurt in September?
Expect around 20.7°C (69.3°F) in the afternoon and 11.7°C (53.1°F) at night, which most visitors would call mild.
Does it rain a lot in Frankfurt in September?
Quite a lot — 53 mm spread over about 9 days.
What should I wear in Frankfurt in September?
Based on the averages: versatile layers, rain protection and sunglasses. Bring something extra for the cooler evenings.
Is September or October better for visiting Frankfurt?
On our 12-month climate ranking, September comes out ahead (#1 of 12 vs #4). October is cooler and has more rainy days.