Where is it mild in September?

Comfortable for walking all day — neither hot nor cold. Ranked from 259 travel destinations using ERA5 climate averages — what September is normally like, not what the weather will do next week.

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Top 20 by September weather

Day and night temperatures are monthly averages of daily highs and lows. Rain is an average across the whole month. Places with the same rating have equally good weather for this; among them, the one covered by more language editions of Wikivoyage, the open travel guide, is listed first. The bar under each place shows its other good months — click one to jump there.
#	Place	Day	Night	Rain	Rating
1	Paris, France	22°C	13°C	1.6 mm/day	Excellent
2	Berlin, Germany	21°C	12°C	1.4 mm/day	Excellent
3	Beijing, China	26°C	15°C	1.5 mm/day	Excellent
4	Budapest, Hungary	22°C	13°C	2.1 mm/day	Excellent
5	Warsaw, Poland	20°C	12°C	1.6 mm/day	Excellent
6	Hamburg, Germany	20°C	12°C	1.6 mm/day	Excellent
7	Sofia, Bulgaria	22°C	12°C	0.9 mm/day	Excellent
8	São Paulo, Brazil	25°C	15°C	2.1 mm/day	Excellent
9	Brussels, Belgium	20°C	12°C	2.1 mm/day	Excellent
10	Strasbourg, France	22°C	13°C	1.9 mm/day	Excellent
11	Nairobi, Kenya	23°C	13°C	1.0 mm/day	Excellent
12	Riga, Latvia	18°C	12°C	1.6 mm/day	Excellent
13	Toronto, Canada	22°C	15°C	1.8 mm/day	Excellent
14	Perth, Australia	19°C	11°C	1.0 mm/day	Excellent
15	San Francisco, United States	24°C	14°C	0.1 mm/day	Excellent
16	Ottawa, Canada	21°C	13°C	2.1 mm/day	Excellent
17	Chicago, United States	23°C	17°C	2.2 mm/day	Excellent
18	Johannesburg, South Africa	25°C	10°C	0.3 mm/day	Excellent
19	Vilnius, Lithuania	18°C	11°C	1.2 mm/day	Excellent
20	Tbilisi, Georgia	25°C	14°C	0.9 mm/day	Excellent

What this ranking does and does not tell you

It rates the weather only — daytime and night temperature, rain and sunshine. It says nothing about what there is to see or do, prices, crowds or safety; that part of the decision is yours.

The candidates are 503 established travel destinations, not every town on Earth, so a place missing here may simply not be on the list.

Looking for something else in September?

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The same question, another month

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