The shoulder month: last climbs, typhoon roulette, and the first genuinely clear mornings since spring.
September is a transition, and the calendar position matters. Early month still behaves like summer: hazy, warm, with the final climbing days before trails close on September 10. Late September brings the first properly clear spells as the air dries out. Typhoons are the wildcard: one can erase a day and then hand you the sharpest morning of the season right behind it. Our logger starts measuring September this year.
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The first half of September extends August: humidity, morning-only views, afternoon cloud. The improvement comes gradually, and by the final week dry northern air starts winning, with visibly sharper mornings and the occasional all-day view.
Typhoon season peaks now. A direct pass shuts everything down for a day or two, but the washed, dry air behind a storm regularly produces the clearest conditions since spring. Flexible travelers can turn typhoons into an advantage.
Crowds fall off a cliff after the trails close on September 10, and lakeside hotel prices follow. Viewpoints that need a queue in August are empty on September weekdays.
Late in the month, cold snaps occasionally dust the summit before the official first-snowcap announcement, which usually comes in October. Catching an early dusting over autumn-tinged forests is a quiet September specialty.
Average visibility score by month, from our measurements
– = soon: our logger started in March 2026 and fills these in automatically.
The last ten days measure and feel like a different month from the first ten. If dates are flexible, go as late as possible.
A one-day buffer turns a typhoon from a trip-ruiner into a delay, and the post-storm morning often repays it with the best view of the month.
The final climbing days offer thinner crowds than August. After September 10 the trails and most huts close for the year.
September conditions swing fast. The live feed plus the forecast score tells you which morning this week is the one.