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SunnyDays

ERA5 almanac — 8 years of real data

The Hamptons in July

The Hamptons in July: 39% of days see measurable rain, 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

Sunshine & warmth in July

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 July. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period Warm & sunny (≥72°F, >6 h sun) Sample (n)
Early July
1st–15th		 88% n=120
Late July
16th–end		 91% n=128
Full month average 90% n=248
13.1 h median sunshine per day 88% of days exceed 8 h sunshine 39% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 44%. Sunshine-based “warm & sunny”: 90%. The 46-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 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

Does it rain in The Hamptons in July?

Sometimes. The Hamptons sees measurable rain on 39% of days in July historically (n=248 days, ERA5 2018–2025) — not frequent enough to plan around, but not negligible either.

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.

How The Hamptons compares in July

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.