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How the score works

One number out of 100, blended from the four factors below: comfort, crowds, prices and weather. Higher means go now. Lower means queues, rain and paying more for the privilege.

Sleep with the window open. It's that kind of season.

Factor breakdown

Crowds

How many other people had the same clever idea. Built from researched monthly visitor patterns, then pushed harder for public holidays, school breaks and big events.

68

Weather

The weather that cancels plans rather than just dampens them. Built from monthly climate baselines plus researched storm, typhoon, smoke and snow periods.

76

Prices

How much the dates themselves cost you. Built from researched monthly demand, with the same holiday and event surges that drive the crowds, because airlines can read a calendar too.

66

Comfort

Whether you will enjoy being outside or merely endure it. Built from average highs and lows, humidity and rain risk.

86

Climate in September

Avg low
15°C
Avg high
21°C
Rain risk
peak
Humidity
comfortable

Better dates

Sep 11 - 13

3 day window

Expect more comfortable conditions and lighter crowds than the month overall.

Comfort Crowds

Sep 11 - 17

7 day window

Expect more comfortable conditions and lighter crowds than the month overall.

Comfort Crowds

Tougher dates

Sep 18 - 20

3 day window

San Sebastian Film Festival Window overlaps this window, with greater price pressure and heavier crowds.

Prices Crowds

Sep 18 - 24

7 day window

San Sebastian Film Festival Window overlaps this window, with greater price pressure and heavier crowds.

Prices Crowds

What shapes September 2026

10 days

Basque Coast Summer Peak

Sep 1-10

Seasonal peak

9 days

San Sebastian Film Festival Window

Sep 18-26

Festival

The season is half the story.You just read it.