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SunnyDays

ERA5 almanac — 8 years of real data

Nassau in January

Nassau in January: 33% of days see measurable rain, 76°F average high, 32% of days historically clear (n=248, ERA5 2018–2025).

Nassau in January is historically a poor month for sun: only 32% of days clear across 8 years (n=248, avg high 76°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 Nassau 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 January

Clear-sky percentage for Nassau in January, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period % Clear days Sample (n) Avg high
Early January
1st–15th		 31% n=120 76°F
Late January
16th–end		 32% n=128 76°F
Full month average 32% n=248 76°F

Sunshine & warmth in January

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 Nassau in January. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period Warm & sunny (≥72°F, >6 h sun) Sample (n)
Early January
1st–15th		 84% n=120
Late January
16th–end		 84% n=128
Full month average 84% n=248
10.2 h median sunshine per day 87% of days exceed 8 h sunshine 33% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 32%. Sunshine-based “warm & sunny”: 84%. The 52-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

Nassau is mostly overcast in January historically: only 32% of days are clear across 8 years (n=248), avg high 76°F. Most visitors this month will see more clouds than sun.

Every month in Nassau

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

Historical clear-sky % for Nassau, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January ← this page 32% n=248 All destinations →
February 34% n=226 All destinations →
March 40% n=248 All destinations →
April 30% n=240 All destinations →
May 20% n=248 All destinations →
June 6% n=240 All destinations →
July 6% n=248 All destinations →
August 8% n=248 All destinations →
September 6% n=240 All destinations →
October 14% n=248 All destinations →
November 28% n=240 All destinations →
December 33% n=248 All destinations →

Frequently asked

Does it rain in Nassau in January?

Sometimes. Nassau sees measurable rain on 33% of days in January historically (n=248 days, ERA5 2018–2025) — not frequent enough to plan around, but not negligible either.

Is Nassau good for sun in January?

It's mixed. Nassau in January is clear on 32% of days historically (avg high 76°F, n=248 days, ERA5 2018–2025) — the outcome varies year to year.

How Nassau compares in January

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