Where is it hot in January?

Genuinely hot, stopping short of dangerous. Ranked from 167 travel destinations using ERA5 climate averages — what January is normally like, not what the weather will do next week.

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Top 20 by January 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	Bangkok, Thailand	32°C	23°C	0.8 mm/day	Excellent
2	Ho Chi Minh City, Vietnam	32°C	23°C	0.5 mm/day	Excellent
3	Perth, Australia	31°C	20°C	1.1 mm/day	Excellent
4	Mumbai, India	29°C	19°C	0.1 mm/day	Excellent
5	Siem Reap, Cambodia	31°C	22°C	0.4 mm/day	Excellent
6	Phnom Penh, Cambodia	32°C	24°C	0.4 mm/day	Excellent
7	Dakar, Senegal	30°C	20°C	0.0 mm/day	Excellent
8	Accra, Ghana	31°C	25°C	0.3 mm/day	Excellent
9	Colombo, Sri Lanka	31°C	23°C	1.5 mm/day	Excellent
10	Cartagena, Colombia	33°C	25°C	0.5 mm/day	Excellent
11	Phuket, Thailand	29°C	26°C	1.4 mm/day	Excellent
12	Mombasa, Kenya	32°C	25°C	0.7 mm/day	Excellent
13	Kochi, India	31°C	23°C	0.6 mm/day	Excellent
14	Langkawi, Malaysia	31°C	25°C	1.4 mm/day	Excellent
15	Natal, Brazil	31°C	24°C	2.7 mm/day	Excellent
16	Alice Springs, Australia	36°C	23°C	1.2 mm/day	Excellent
17	Granada, Nicaragua	30°C	23°C	0.1 mm/day	Excellent
18	Puerto Escondido, Mexico	29°C	21°C	0.6 mm/day	Excellent
19	Máncora, Peru	30°C	23°C	1.1 mm/day	Excellent
20	Vilanculos, Mozambique	32°C	22°C	1.7 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 January?

warm dry sunny mild cool

The same question, another month

January February March April May June July August September October November December