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SunnyDays

ERA5 almanac — 8 years of real data

Mazatlán in October

Mazatlán in October: 27% of days see measurable rain, 86°F average high, 58% of days historically clear (n=248, ERA5 2018–2025).

Mazatlán in October is a mixed month for sun: 58% of days historically clear (n=248, avg high 86°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 Mazatlán 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 Mazatlán 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		 49% n=120 86°F
Late October
16th–end		 67% n=128 86°F
Full month average 58% n=248 86°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 Mazatlán 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		 92% n=120
Late October
16th–end		 95% n=128
Full month average 94% n=248
11.1 h median sunshine per day 91% 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: 58%. Sunshine-based “warm & sunny”: 94%. The 36-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

Mazatlán in October is genuinely mixed: 58% of days historically clear (n=248), avg high 86°F — more clear than cloudy. The outcome varies year to year; don't book if you need guaranteed sun.

Every month in Mazatlán

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

Historical clear-sky % for Mazatlán, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 91% n=248 All destinations →
February 85% n=226 All destinations →
March 98% n=248 All destinations →
April 98% n=240 All destinations →
May 97% n=248 All destinations →
June 62% n=240 All destinations →
July 33% n=248 All destinations →
August 16% n=248 All destinations →
September 15% n=240 All destinations →
October ← this page 58% n=248 All destinations →
November 90% n=240 All destinations →
December 93% n=248 All destinations →

Frequently asked

Does it rain in Mazatlán in October?

Sometimes. Mazatlán sees measurable rain on 27% of days in October historically (n=248 days, ERA5 2018–2025) — not frequent enough to plan around, but not negligible either.

Is Mazatlán good for sun in October?

It's mixed. Mazatlán in October is clear on 58% of days historically (avg high 86°F, n=248 days, ERA5 2018–2025) — the outcome varies year to year.

How Mazatlán compares in October

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