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SunnyDays

ERA5 almanac — 8 years of real data

Bangkok in April

Bangkok in April: 42% of days see measurable rain, 93°F average high, 32% of days historically clear (n=240, ERA5 2018–2025).

Bangkok in April is historically a poor month for sun: only 32% of days clear across 8 years (n=240, avg high 93°F). 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 Bangkok 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 April

Clear-sky percentage for Bangkok in April, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period % Clear days Sample (n) Avg high
Early April
1st–15th		 33% n=120 93°F
Late April
16th–end		 31% n=120 93°F
Full month average 32% n=240 93°F

Sunshine & warmth in April

A second measure using actual sunshine hours (ERA5 sunshine_duration), not the daily weather code. A Lowcountry day with 12 hours of sun and a 25-minute afternoon storm is counted below as a warm, sunny day — because it was. How we define this.

Sunshine-based metrics for Bangkok in April. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period Warm & sunny (≥72°F, >6 h sun) Sample (n)
Early April
1st–15th		 97% n=120
Late April
16th–end		 94% n=120
Full month average 96% n=240
11.7 h median sunshine per day 91% of days exceed 8 h sunshine 42% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 32%. Sunshine-based “warm & sunny”: 96%. The 64-point gap is from brief afternoon convective storms that stamp the whole day as “rain” in the WMO code but leave the bulk of the sunshine untouched.

Bottom line

Bangkok is mostly overcast in April historically: only 32% of days are clear across 8 years (n=240), avg high 93°F. Most visitors this month will see more clouds than sun.

Every month in Bangkok

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

Historical clear-sky % for Bangkok, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 69% n=248 All destinations →
February 46% n=226 All destinations →
March 35% n=248 All destinations →
April ← this page 32% n=240 All destinations →
May 10% n=248 All destinations →
June 2% n=240 All destinations →
July 0% n=248 All destinations →
August 4% n=248 All destinations →
September 2% n=240 All destinations →
October 11% n=248 All destinations →
November 42% n=240 All destinations →
December 69% n=248 All destinations →

Frequently asked

Does it rain in Bangkok in April?

Sometimes. Bangkok sees measurable rain on 42% of days in April historically (n=240 days, ERA5 2018–2025) — not frequent enough to plan around, but not negligible either.

Is Bangkok good for sun in April?

It's mixed. Bangkok in April is clear on 32% of days historically (avg high 93°F, n=240 days, ERA5 2018–2025) — the outcome varies year to year.

How Bangkok compares in April

Head-to-head clear-sky comparisons against destinations travelers plausibly weigh against Bangkok this month — same passport tier, similar flight distance, both sides from the same 8-year ERA5 record.

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.