ERA5 almanac — 8 years of real data

The Hamptons in July

The Hamptons in July: rain frequency data not yet backfilled for this month, 78°F average high, 44% of days historically clear (n=248, ERA5 2018–2025).

The Hamptons in July is a mixed month for sun: 44% of days historically clear (n=248, avg high 78°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 July

Clear-sky percentage for The Hamptons in July, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period	% Clear days	Sample (n)	Avg high
Early July 1st–15th	47%	n=120	78°F
Late July 16th–end	41%	n=128	78°F
Full month average	44%	n=248	78°F

Bottom line

The Hamptons in July is genuinely mixed: 44% of days historically clear (n=248), avg high 78°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 ← this page	44%	n=248	All destinations →
August	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

Is The Hamptons good for sun in July?

It's mixed. The Hamptons in July is clear on 44% of days historically (avg high 78°F, n=248 days, ERA5 2018–2025) — the outcome varies year to year.

→ The Hamptons live forecast — this week’s actual 7-day weather, not historical
→ Best destinations in July — all destinations ranked by July 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.