Skip to main content
SunnyDays

ERA5 almanac — 8 years of real data

Newport Beach in August

Historically one of the better months to visit Newport Beach for sun: 88% of days are clear on average (n=248, avg high 76°F). Every percentage here is a historical average from 8 years of ERA5 data — 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 Newport Beach 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 Newport Beach 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		 91% n=120 76°F
Late August
16th–end		 85% n=128 76°F
Full month average 88% n=248 76°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 Newport Beach 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		 94% n=120
Late August
16th–end		 92% n=128
Full month average 93% n=248
12.3 h median sunshine per day 98% of days exceed 8 h sunshine 2% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 88%. Sunshine-based “warm & sunny”: 93%.

Bottom line

Newport Beach is historically one of the best US destinations for sun in August: 88% of days meet the clear bar (avg high 76°F, n=248 days across 8 years). Pack for outdoor activity — this month consistently delivers.

Every month in Newport Beach

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

Historical clear-sky % for Newport Beach, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 8% n=248 All destinations →
February 6% n=226 All destinations →
March 2% n=248 All destinations →
April 10% n=240 All destinations →
May 8% n=248 All destinations →
June 25% n=240 All destinations →
July 71% n=248 All destinations →
August ← this page 88% n=248 All destinations →
September 70% n=240 All destinations →
October 49% n=248 All destinations →
November 22% n=240 All destinations →
December 5% n=248 All destinations →

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.