ERA5 almanac — 8 years of real data

Lanai in November

Lanai in November: 27% of days see measurable rain, 79°F average high, 31% of days historically clear (n=240, ERA5 2018–2025).

Lanai in November is historically a poor month for sun: only 31% of days clear across 8 years (n=240, avg high 79°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 Lanai 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 November

Clear-sky percentage for Lanai in November, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period	% Clear days	Sample (n)	Avg high
Early November 1st–15th	32%	n=120	79°F
Late November 16th–end	30%	n=120	79°F
Full month average	31%	n=240	79°F

Sunshine & warmth in November

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 Lanai in November. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period	Warm & sunny (≥72°F, >6 h sun)	Sample (n)
Early November 1st–15th	98%	n=120
Late November 16th–end	96%	n=120
Full month average	97%	n=240

10.8 h median sunshine per day 94% of days exceed 8 h sunshine 27% of days see ≥ 1 mm rain — rain is not hidden

Comparison (old vs new): WMO-code “clear” bar: 31%. Sunshine-based “warm & sunny”: 97%. The 66-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

Lanai is mostly overcast in November historically: only 31% of days are clear across 8 years (n=240), avg high 79°F. Most visitors this month will see more clouds than sun.

Every month in Lanai

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

Historical clear-sky % for Lanai, all months, ERA5 2018–2025.
Month	% Clear	Sample (n)
January	32%	n=248	All destinations →
February	19%	n=226	All destinations →
March	20%	n=248	All destinations →
April	14%	n=240	All destinations →
May	17%	n=248	All destinations →
June	20%	n=240	All destinations →
July	20%	n=248	All destinations →
August	26%	n=248	All destinations →
September	16%	n=240	All destinations →
October	20%	n=248	All destinations →
November ← this page	31%	n=240	All destinations →
December	27%	n=248	All destinations →

Frequently asked

Does it rain in Lanai in November?

Sometimes. Lanai sees measurable rain on 27% of days in November historically (n=240 days, ERA5 2018–2025) — not frequent enough to plan around, but not negligible either.

Is Lanai good for sun in November?

It's mixed. Lanai in November is clear on 31% of days historically (avg high 79°F, n=240 days, ERA5 2018–2025) — the outcome varies year to year.

How Lanai compares in November

Head-to-head clear-sky comparisons against destinations travelers plausibly weigh against Lanai this month — same passport tier, similar flight distance, both sides from the same 8-year ERA5 record.

→ Lanai vs Maui in November — Maui is 30% clear historically
→ Lanai vs Honolulu in November — Honolulu is 26% clear historically

→ Lanai live forecast — this week’s actual 7-day weather, not historical
→ Best destinations in November — all destinations ranked by November clear-sky %
→ All destinations
→ Raw data (JSON) — buckets, n, source

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.