Skip to main content
SunnyDays

ERA5 almanac — 8 years of real data

Newport Beach in October

Newport Beach in October is a mixed month for sun: 49% of days historically clear (n=248, avg high 73°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 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 October

Clear-sky percentage for Newport Beach in October, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period % Clear days Sample (n) Avg high
Early October
1st–15th		 53% n=120 73°F
Late October
16th–end		 46% n=128 73°F
Full month average 49% n=248 73°F

Sunshine & warmth in October

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 October. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period Warm & sunny (≥72°F, >6 h sun) Sample (n)
Early October
1st–15th		 59% n=120
Late October
16th–end		 48% n=128
Full month average 53% n=248
10.6 h median sunshine per day 89% of days exceed 8 h sunshine 8% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 49%. Sunshine-based “warm & sunny”: 53%.

Bottom line

Newport Beach in October is genuinely mixed: 49% of days historically clear (n=248), avg high 73°F — roughly even odds. The outcome varies year to year; don't book if you need guaranteed sun.

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 88% n=248 All destinations →
September 70% n=240 All destinations →
October ← this page 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.