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SunnyDays

ERA5 almanac — 8 years of real data

Marrakech in September

Marrakech in September: 4% of days see measurable rain, 92°F average high, 83% of days historically clear (n=240, ERA5 2018–2025).

Historically one of the better months to visit Marrakech for sun: 83% of days are clear on average (n=240, avg high 92°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 Marrakech 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 September

Clear-sky percentage for Marrakech in September, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period % Clear days Sample (n) Avg high
Early September
1st–15th		 79% n=120 92°F
Late September
16th–end		 87% n=120 92°F
Full month average 83% n=240 92°F

Sunshine & warmth in September

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 Marrakech in September. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period Warm & sunny (≥72°F, >6 h sun) Sample (n)
Early September
1st–15th		 98% n=120
Late September
16th–end		 98% n=120
Full month average 98% n=240
11.2 h median sunshine per day 92% of days exceed 8 h sunshine 4% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 83%. Sunshine-based “warm & sunny”: 98%. The 15-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

Marrakech is historically one of the best destinations for sun in September: 83% of days meet the clear bar (avg high 92°F, n=240 days across 8 years). Pack for outdoor activity — this month consistently delivers.

Every month in Marrakech

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

Historical clear-sky % for Marrakech, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 28% n=248 All destinations →
February 48% n=226 All destinations →
March 42% n=248 All destinations →
April 60% n=240 All destinations →
May 76% n=248 All destinations →
June 90% n=240 All destinations →
July 97% n=248 All destinations →
August 98% n=248 All destinations →
September ← this page 83% n=240 All destinations →
October 79% n=248 All destinations →
November 60% n=240 All destinations →
December 37% n=248 All destinations →

Frequently asked

Does it rain in Marrakech in September?

Rarely. Only 4% of days in Marrakech see measurable rain in September, based on 8 years of ERA5 historical data (n=240 days, 2018–2025). This is a historical average, not a forecast.

Is Marrakech good for sun in September?

Yes. Marrakech is historically strong for sun in September: 83% of days are clear on average (avg high 92°F, n=240 days, ERA5 2018–2025).

How Marrakech compares in September

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