ERA5 almanac — 8 years of real data

Rome in July

Rome in July: 12% of days see measurable rain, 92°F average high, 77% of days historically clear (n=248, ERA5 2018–2025).

Historically one of the better months to visit Rome for sun: 77% of days are clear on average (n=248, 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 Rome 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 July

Clear-sky percentage for Rome in July, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period	% Clear days	Sample (n)	Avg high
Early July 1st–15th	75%	n=120	92°F
Late July 16th–end	79%	n=128	92°F
Full month average	77%	n=248	92°F

Sunshine & warmth in July

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 Rome in July. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period	Warm & sunny (≥72°F, >6 h sun)	Sample (n)
Early July 1st–15th	100%	n=120
Late July 16th–end	100%	n=128
Full month average	100%	n=248

14.1 h median sunshine per day 100% of days exceed 8 h sunshine 12% of days see ≥ 1 mm rain — rain is not hidden

Comparison (old vs new): WMO-code “clear” bar: 77%. Sunshine-based “warm & sunny”: 100%. The 23-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

Rome clears solidly in July: 77% of days historically (n=248), avg high 92°F. Most trips here in July will find more sun than cloud.

Every month in Rome

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

Historical clear-sky % for Rome, all months, ERA5 2018–2025.
Month	% Clear	Sample (n)
January	0%	n=248	All destinations →
February	0%	n=226	All destinations →
March	2%	n=248	All destinations →
April	16%	n=240	All destinations →
May	30%	n=248	All destinations →
June	65%	n=240	All destinations →
July ← this page	77%	n=248	All destinations →
August	59%	n=248	All destinations →
September	50%	n=240	All destinations →
October	38%	n=248	All destinations →
November	2%	n=240	All destinations →
December	0%	n=248	All destinations →

Frequently asked

Does it rain in Rome in July?

Rarely. Only 12% of days in Rome see measurable rain in July, based on 8 years of ERA5 historical data (n=248 days, 2018–2025). This is a historical average, not a forecast.

Is Rome good for sun in July?

Yes. Rome is historically strong for sun in July: 77% of days are clear on average (avg high 92°F, n=248 days, ERA5 2018–2025).

How Rome compares in July

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

→ Rome vs Dubrovnik in July — Dubrovnik is 77% clear historically
→ Rome vs Nice / Côte d'Azur in July — Nice / Côte d'Azur is 78% clear historically
→ Rome vs Mallorca in July — Mallorca is 80% clear historically

→ Rome live forecast — this week’s actual 7-day weather, not historical
→ Best destinations in July — all destinations ranked by July 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.