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SunnyDays

ERA5 almanac — 8 years of real data

Mexico City in March

Mexico City in March: 10% of days see measurable rain, 81°F average high, 71% of days historically clear (n=248, ERA5 2018–2025).

Historically one of the better months to visit Mexico City for sun: 71% of days are clear on average (n=248, avg high 81°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 Mexico City 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 March

Clear-sky percentage for Mexico City in March, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period % Clear days Sample (n) Avg high
Early March
1st–15th		 68% n=120 81°F
Late March
16th–end		 73% n=128 81°F
Full month average 71% n=248 81°F

Sunshine & warmth in March

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 Mexico City in March. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period Warm & sunny (≥72°F, >6 h sun) Sample (n)
Early March
1st–15th		 99% n=120
Late March
16th–end		 99% n=128
Full month average 99% n=248
11.7 h median sunshine per day 100% of days exceed 8 h sunshine 10% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 71%. Sunshine-based “warm & sunny”: 99%. The 28-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

Mexico City clears solidly in March: 71% of days historically (n=248), avg high 81°F. Most trips here in March will find more sun than cloud.

Every month in Mexico City

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

Historical clear-sky % for Mexico City, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 52% n=248 All destinations →
February 71% n=226 All destinations →
March ← this page 71% n=248 All destinations →
April 51% n=240 All destinations →
May 33% n=248 All destinations →
June 18% n=240 All destinations →
July 1% n=248 All destinations →
August 2% n=248 All destinations →
September 4% n=240 All destinations →
October 20% n=248 All destinations →
November 52% n=240 All destinations →
December 50% n=248 All destinations →

Frequently asked

Does it rain in Mexico City in March?

Rarely. Only 10% of days in Mexico City see measurable rain in March, based on 8 years of ERA5 historical data (n=248 days, 2018–2025). This is a historical average, not a forecast.

Is Mexico City good for sun in March?

Yes. Mexico City is historically strong for sun in March: 71% of days are clear on average (avg high 81°F, n=248 days, ERA5 2018–2025).

How Mexico City compares in March

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