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SunnyDays

ERA5 almanac — 8 years of real data

Montauk in July

Montauk in July: 29% of days see measurable rain, 73°F average high, 29% of days historically clear (n=248, ERA5 2018–2025).

Montauk in July is historically a poor month for sun: only 29% of days clear across 8 years (n=248, avg high 73°F). August is the clearest month for Montauk 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 Montauk 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 Montauk 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		 16% n=120 73°F
Late July
16th–end		 41% n=128 73°F
Full month average 29% n=248 73°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 Montauk 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		 31% n=120
Late July
16th–end		 78% n=128
Full month average 55% n=248
13.2 h median sunshine per day 89% of days exceed 8 h sunshine 29% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 29%. Sunshine-based “warm & sunny”: 55%. The 26-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

Montauk is mostly overcast in July historically: only 29% of days are clear across 8 years (n=248), avg high 73°F. The two halves differ materially (16% early, 41% late) — favour the late half of the month. If you want sun in Montauk, August is historically much better. Most visitors this month will see more clouds than sun.

→ See all destinations in August — historically the best month for sun in Montauk.

Every month in Montauk

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

Historical clear-sky % for Montauk, 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 0% n=248 All destinations →
June 2% n=240 All destinations →
July ← this page 29% n=248 All destinations →
August 37% n=248 All destinations →
September 10% n=240 All destinations →
October 0% n=248 All destinations →
November 0% n=240 All destinations →
December 0% n=248 All destinations →

Frequently asked

Does it rain in Montauk in July?

Sometimes. Montauk sees measurable rain on 29% of days in July historically (n=248 days, ERA5 2018–2025) — not frequent enough to plan around, but not negligible either.

Is Montauk good for sun in July?

Not usually. Montauk is historically overcast in July: only 29% of days are clear (avg high 73°F, n=248 days, ERA5 2018–2025). August is historically far better for sun here.

How Montauk compares in July

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