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Töölö Weather in September
Töölö, Helsinki, Finland
About Töölö in September
Töölö benefits from the cooling effect of Töölönlahti bay and the extensive green canopy of Hesperia Park, which together lower summer temperatures by 1–2°C compared to the commercial core. In winter, the bay acts as a cold air reservoir, and frost forms earlier here than in the denser stone districts to the south.
For detailed monthly temperature and rainfall data for Helsinki in September, see the Helsinki September weather guide.