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SunnyDays

ERA5 almanac — 8 years of real data

Lisbon in June

Lisbon in June: 16% of days see measurable rain, 76°F average high, 58% of days historically clear (n=240, ERA5 2018–2025).

Lisbon in June is a mixed month for sun: 58% of days historically clear (n=240, avg high 76°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 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 June

Clear-sky percentage for Lisbon in June, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period % Clear days Sample (n) Avg high
Early June
1st–15th		 52% n=120 76°F
Late June
16th–end		 63% n=120 76°F
Full month average 58% n=240 76°F

Sunshine & warmth in June

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 June. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period Warm & sunny (≥72°F, >6 h sun) Sample (n)
Early June
1st–15th		 65% n=120
Late June
16th–end		 80% n=120
Full month average 72% n=240
14.0 h median sunshine per day 96% of days exceed 8 h sunshine 16% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 58%. Sunshine-based “warm & sunny”: 72%. 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 in June is genuinely mixed: 58% of days historically clear (n=240), avg high 76°F — more clear than cloudy. The outcome varies year to year; don't book if you need guaranteed sun.

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 ← this page 58% n=240 All destinations →
July 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 June?

Rarely. Only 16% of days in Lisbon see measurable rain in June, based on 8 years of ERA5 historical data (n=240 days, 2018–2025). This is a historical average, not a forecast.

Is Lisbon good for sun in June?

It's mixed. Lisbon in June is clear on 58% of days historically (avg high 76°F, n=240 days, ERA5 2018–2025) — the outcome varies year to year.

How Lisbon compares in June

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.

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.