ERA5 almanac — 8 years of real data

Phuket in January

Phuket in January: rain frequency data not yet backfilled for this month, 87°F average high, 25% of days historically clear (n=248, ERA5 2018–2025).

Phuket in January is historically a poor month for sun: only 25% of days clear across 8 years (n=248, avg high 87°F). February is the clearest month for Phuket historically. Historical average, not a forecast.

What you are reading: 8-year historical averages from the ERA5 reanalysis, not a forecast. A month that is historically 90% clear can still be overcast on your specific trip. For this week’s actual forecast, see the live Phuket page. Both can be true at once: “historically strong in this month; this particular week is not.” We label which is which.

Early vs. Late January

Clear-sky percentage for Phuket in January, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period	% Clear days	Sample (n)	Avg high
Early January 1st–15th	19%	n=120	87°F
Late January 16th–end	30%	n=128	87°F
Full month average	25%	n=248	87°F

Bottom line

Phuket is mostly overcast in January historically: only 25% of days are clear across 8 years (n=248), avg high 87°F. If you want sun in Phuket, February is historically much better. Most visitors this month will see more clouds than sun.

→ See all destinations in February — historically the best month for sun in Phuket.

Every month in Phuket

Compare across all months with data. Numbers are historical clear-sky %.

Historical clear-sky % for Phuket, all months, ERA5 2018–2025.
Month	% Clear	Sample (n)
January ← this page	25%	n=248	All destinations →
February	41%	n=226	All destinations →
March	29%	n=248	All destinations →
April	8%	n=240	All destinations →
May	5%	n=248	All destinations →
June	8%	n=240	All destinations →
July	8%	n=248	All destinations →
August	6%	n=248	All destinations →
September	3%	n=240	All destinations →
October	2%	n=248	All destinations →
November	4%	n=240	All destinations →
December	16%	n=248	All destinations →

Frequently asked

Is Phuket good for sun in January?

Not usually. Phuket is historically overcast in January: only 25% of days are clear (avg high 87°F, n=248 days, ERA5 2018–2025). February is historically far better for sun here.

→ Phuket live forecast — this week’s actual 7-day weather, not historical
→ Best destinations in January — all destinations ranked by January clear-sky %
→ All destinations
→ Raw data (JSON) — buckets, n, source

All percentages are historical averages from the ERA5 reanalysis via Open-Meteo, 8 full years (2018–2025). “Clear” means avg high ≥ 72 °F, precipitation < 1 mm, and a non-precipitation weather code. This is history, not a forecast. The live 7-day outlook for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.