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SunnyDays

ERA5 almanac — 8 years of real data

Kennebunkport in August

Kennebunkport in August: 32% of days see measurable rain, 75°F average high, 34% of days historically clear (n=248, ERA5 2018–2025).

Kennebunkport in August is historically a poor month for sun: only 34% of days clear across 8 years (n=248, avg high 75°F). 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 Kennebunkport 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 Kennebunkport 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		 39% n=120 75°F
Late August
16th–end		 29% n=128 75°F
Full month average 34% n=248 75°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 Kennebunkport 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		 78% n=120
Late August
16th–end		 57% n=128
Full month average 67% n=248
12.7 h median sunshine per day 83% of days exceed 8 h sunshine 32% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 34%. Sunshine-based “warm & sunny”: 67%. The 33-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

Kennebunkport is mostly overcast in August historically: only 34% of days are clear across 8 years (n=248), avg high 75°F. Most visitors this month will see more clouds than sun.

Every month in Kennebunkport

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

Historical clear-sky % for Kennebunkport, 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 8% n=248 All destinations →
June 20% n=240 All destinations →
July 39% n=248 All destinations →
August ← this page 34% n=248 All destinations →
September 18% n=240 All destinations →
October 4% n=248 All destinations →
November 0% n=240 All destinations →
December 0% n=248 All destinations →

Frequently asked

Does it rain in Kennebunkport in August?

Sometimes. Kennebunkport sees measurable rain on 32% of days in August historically (n=248 days, ERA5 2018–2025) — not frequent enough to plan around, but not negligible either.

Is Kennebunkport good for sun in August?

It's mixed. Kennebunkport in August is clear on 34% of days historically (avg high 75°F, n=248 days, ERA5 2018–2025) — the outcome varies year to year.

How Kennebunkport compares in August

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