Where is it mild in October?

Comfortable for walking all day — neither hot nor cold. Ranked from 297 travel destinations using ERA5 climate averages — what October is normally like, not what the weather will do next week.

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Top 20 by October 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	Lisbon, Portugal	21°C	15°C	2.2 mm/day	Excellent
2	Istanbul, Turkey	20°C	15°C	1.2 mm/day	Excellent
3	Athens, Greece	23°C	15°C	0.5 mm/day	Excellent
4	Buenos Aires, Argentina	21°C	14°C	2.1 mm/day	Excellent
5	Baku, Azerbaijan	20°C	15°C	1.1 mm/day	Excellent
6	Mexico City, Mexico	20°C	10°C	2.2 mm/day	Excellent
7	Nairobi, Kenya	24°C	14°C	1.0 mm/day	Excellent
8	Addis Ababa, Ethiopia	21°C	9°C	2.1 mm/day	Excellent
9	Perth, Australia	22°C	13°C	1.1 mm/day	Excellent
10	Santiago, Chile	19°C	8°C	2.0 mm/day	Excellent
11	San Francisco, United States	22°C	13°C	0.7 mm/day	Excellent
12	Cape Town, South Africa	19°C	14°C	0.5 mm/day	Excellent
13	Tbilisi, Georgia	18°C	8°C	1.4 mm/day	Excellent
14	Lima, Peru	21°C	15°C	0.3 mm/day	Excellent
15	Montevideo, Uruguay	20°C	13°C	2.1 mm/day	Excellent
16	Palermo, Italy	22°C	14°C	2.1 mm/day	Excellent
17	Thessaloniki, Greece	20°C	13°C	0.7 mm/day	Excellent
18	Granada, Spain	23°C	11°C	1.8 mm/day	Excellent
19	Valencia, Spain	24°C	16°C	2.2 mm/day	Excellent
20	İzmir, Turkey	24°C	13°C	0.8 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 October?

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The same question, another month

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