ERA5 almanac — 8 years of real data

Lisbon in July

Lisbon in July: 2% of days see measurable rain, 83°F average high, 85% of days historically clear (n=248, ERA5 2018–2025).

Historically one of the better months to visit Lisbon for sun: 85% of days are clear on average (n=248, avg high 83°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 Lisbon 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 Lisbon 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	78%	n=120	83°F
Late July 16th–end	91%	n=128	83°F
Full month average	85%	n=248	83°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 Lisbon 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	97%	n=120
Late July 16th–end	100%	n=128
Full month average	99%	n=248

13.9 h median sunshine per day 98% of days exceed 8 h sunshine 2% of days see ≥ 1 mm rain — rain is not hidden

Comparison (old vs new): WMO-code “clear” bar: 85%. Sunshine-based “warm & sunny”: 99%. The 14-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

Lisbon is historically one of the best destinations for sun in July: 85% of days meet the clear bar (avg high 83°F, n=248 days across 8 years). Pack for outdoor activity — this month consistently delivers.

Every month in Lisbon

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

Historical clear-sky % for Lisbon, all months, ERA5 2018–2025.
Month	% Clear	Sample (n)
January	0%	n=248	All destinations →
February	0%	n=226	All destinations →
March	7%	n=248	All destinations →
April	19%	n=240	All destinations →
May	49%	n=248	All destinations →
June	58%	n=240	All destinations →
July ← this page	85%	n=248	All destinations →
August	91%	n=248	All destinations →
September	66%	n=240	All destinations →
October	42%	n=248	All destinations →
November	2%	n=240	All destinations →
December	0%	n=248	All destinations →

Frequently asked

Does it rain in Lisbon in July?

Rarely. Only 2% of days in Lisbon 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 Lisbon good for sun in July?

Yes. Lisbon is historically strong for sun in July: 85% of days are clear on average (avg high 83°F, n=248 days, ERA5 2018–2025).

How Lisbon compares in July

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

→ Lisbon vs Athens in July — Athens is 82% clear historically
→ Lisbon vs Ibiza in July — Ibiza is 88% clear historically
→ Lisbon vs Mallorca in July — Mallorca is 80% clear historically

→ Lisbon 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.