Paris edges it in September. Paris averages 13–23°C with moderate crowds; London 14–21°C with moderate-high crowds.
By Daan · Last reviewed October 2026
Paris and London
The verdict for September
Best weather, city back to work
+Warm, clear days with summer crowds already gone.
–Trade fairs and Fashion Week tighten hotel availability.
The steadiest weather of the year with a fully functioning city.
Summer weather, fewer people
+Summer crowds begin to ease while warm weather and major events continue.
–Fashion Week and other major events can tighten hotel availability.
Close to July weather with noticeably more room to move.
Scores and crowd levels are my own judgement; temperatures are monthly averages. Higher scores are better: quieter, cheaper and more pleasant.
Another month