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SunnyDays

ERA5 almanac — 8 years of real data

The Hamptons in August

The Hamptons in August: 36% of days see measurable rain, 77°F average high, 44% of days historically clear (n=248, ERA5 2018–2025).

The Hamptons in August is a mixed month for sun: 44% of days historically clear (n=248, avg high 77°F). The outcome varies year to year — check the early/late split below. 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 The Hamptons 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 August

Clear-sky percentage for The Hamptons in August, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period % Clear days Sample (n) Avg high
Early August
1st–15th		 42% n=120 77°F
Late August
16th–end		 45% n=128 77°F
Full month average 44% n=248 77°F

Sunshine & warmth in August

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 The Hamptons in August. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period Warm & sunny (≥72°F, >6 h sun) Sample (n)
Early August
1st–15th		 90% n=120
Late August
16th–end		 79% n=128
Full month average 84% n=248
12.6 h median sunshine per day 84% of days exceed 8 h sunshine 36% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 44%. Sunshine-based “warm & sunny”: 84%. The 40-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

The Hamptons in August is genuinely mixed: 44% of days historically clear (n=248), avg high 77°F — more cloudy than clear. The outcome varies year to year; don't book if you need guaranteed sun.

Every month in The Hamptons

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

Historical clear-sky % for The Hamptons, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 0% n=248 All destinations →
February 0% n=226 All destinations →
March 0% n=248 All destinations →
April 0% n=240 All destinations →
May 3% n=248 All destinations →
June 22% n=240 All destinations →
July 44% n=248 All destinations →
August ← this page 44% n=248 All destinations →
September 28% n=240 All destinations →
October 3% n=248 All destinations →
November 0% n=240 All destinations →
December 0% n=248 All destinations →

Frequently asked

Does it rain in The Hamptons in August?

Sometimes. The Hamptons sees measurable rain on 36% of days in August historically (n=248 days, ERA5 2018–2025) — not frequent enough to plan around, but not negligible either.

Is The Hamptons good for sun in August?

It's mixed. The Hamptons in August is clear on 44% of days historically (avg high 77°F, n=248 days, ERA5 2018–2025) — the outcome varies year to year.

How The Hamptons compares in August

Head-to-head clear-sky comparisons against destinations travelers plausibly weigh against The Hamptons 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.