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SunnyDays

ERA5 almanac — 8 years of real data

Antigua in May

Antigua in May: 62% of days see measurable rain, 84°F average high, 5% of days historically clear (n=248, ERA5 2018–2025).

Antigua in May is historically a poor month for sun: only 5% of days clear across 8 years (n=248, avg high 84°F). March is the clearest month for Antigua 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 Antigua 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 May

Clear-sky percentage for Antigua in May, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period % Clear days Sample (n) Avg high
Early May
1st–15th		 2% n=120 84°F
Late May
16th–end		 7% n=128 84°F
Full month average 5% n=248 84°F

Sunshine & warmth in May

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 Antigua in May. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period Warm & sunny (≥72°F, >6 h sun) Sample (n)
Early May
1st–15th		 99% n=120
Late May
16th–end		 98% n=128
Full month average 98% n=248
12.0 h median sunshine per day 96% of days exceed 8 h sunshine 62% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 5%. Sunshine-based “warm & sunny”: 98%. The 93-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

Antigua is a poor choice for sun in May: just 5% of days clear historically (n=248). March is the historically strongest month for sun here. The 8-year record is consistent — this is not a fluke bad stretch.

→ See all destinations in March — historically the best month for sun in Antigua.

Every month in Antigua

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

Historical clear-sky % for Antigua, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 14% n=248 All destinations →
February 7% n=226 All destinations →
March 18% n=248 All destinations →
April 8% n=240 All destinations →
May ← this page 5% n=248 All destinations →
June 4% n=240 All destinations →
July 4% n=248 All destinations →
August 4% n=248 All destinations →
September 5% n=240 All destinations →
October 6% n=248 All destinations →
November 8% n=240 All destinations →
December 16% n=248 All destinations →

Frequently asked

Does it rain in Antigua in May?

Yes, frequently. In Antigua, 62% of days in May see measurable rain, based on 8 years of ERA5 historical data (n=248 days, 2018–2025). This is a historical average, not a forecast.

Is Antigua good for sun in May?

Not usually. Antigua is historically overcast in May: only 5% of days are clear (avg high 84°F, n=248 days, ERA5 2018–2025). March is historically far better for sun here.

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.