Lisbon from Boston
5,124 km, about 7h 10m in the air. Every month scored for the weather at Lisbon and for the holidays that crowd it out at both ends.
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when a fare is genuinely below what that route normally costs, and
/stop ends it.
Public holidays at Boston move this destination's year too little to make it a different answer, so the Lisbon page is the one of record. This one is kept for the distance and the flight it implies.
No fare history on BOS–LIS yet, so this ranking is climate and crowds only. The price column fills in as the scanner collects.
Month by month from Boston
| Month | Max °C | Rain days | Crowds | Verdict | Why |
|---|---|---|---|---|---|
| Jan | 14° | 8d | 80 | ok | 14C max, 8 rainy days |
| Feb | 16° | 7d | 100 | good | 16C max, 7 rainy days |
| Mar | 17° | 8d | 100 | good | 17C max, 8 rainy days |
| Apr | 20° | 8d | 85 | good | 20C max, 8 rainy days |
| May | 23° | 3d | 85 | sweet spot | 23C max, 3 rainy days |
| Jun | 25° | 3d | 65 | sweet spot busy | peak: Ideal summer weather, high demand among tourists. |
| Jul | 28° | 0d | 65 | sweet spot busy | peak: Ideal summer weather, high demand among tourists. |
| Aug | 29° | 1d | 65 | sweet spot busy | peak: Ideal summer weather, high demand among tourists. |
| Sep | 26° | 3d | 85 | sweet spot | 26C max, 3 rainy days |
| Oct | 23° | 7d | 65 | goodbusy | shoulder season |
| Nov | 18° | 9d | 80 | ok | 18C max, 9 rainy days |
| Dec | 15° | 8d | 80 | ok | 15C max, 8 rainy days |
Crowds is a score out of 100 where higher is quieter. It counts public-holiday clusters in US as well as at Lisbon, which is why this table differs from the same one read from another country. A busy month is a crowded one, not a bad one — usually it is crowded because the weather is good. Crowds alone never make a month “avoid”: that is reserved for weather worth skipping.
The year in Lisbon
Lisbon has a Mediterranean climate with mild winters and hot summers. The peak tourist season occurs in summer when the weather is warm and sunny, while spring and fall offer more moderate conditions and less crowding.
| Busiest |
early Jun to late Aug — Ideal summer weather, high demand among tourists.
|
|---|---|
| Quieter, still good |
early Apr to late May — Pleasant spring weather and fewer crowds.
early Sep to late Oct — Milder temperatures and reduced tourist traffic.
|
This section was written by a language model from the climate figures above, and nobody has checked it. The month-by-month table is measured — ten years of ERA5 readings and published holiday calendars — and where the two disagree, the table is the one to believe. The busiest and quieter periods here also count toward the crowd score, which is 20% of the ranking.
The rest of the trip
Lisbon from anywhere · everywhere from Boston
Some links above are affiliate links: if you book through one, we may earn a commission at no extra cost to you. It does not affect the scores on this page, which are computed from climate, holiday and fare data before any link is built.