Average temperatures, rainfall and packing tips for Helsinki, Finland in December
December in Helsinki is typically cold, with average daytime highs around 3°C and nights near -2°C. Temperature-wise it sits mid-range for Helsinki (the 9th warmest month).
Expect some rain: around 77 mm falls in Helsinki during December on average.
If your dates are flexible, the most comfortable months in Helsinki are usually June, July, August and September.
← Helsinki weather tomorrow (live)
In December, Helsinki averages a daytime high of about 3°C and a night-time low of around -2°C, based on recent historical data.
Expect some rain: around 77 mm falls in Helsinki during December on average.
December is cold in Helsinki. City sightseeing works fine if you dress for it, but pack properly and expect short days. If your dates are flexible, the most comfortable months in Helsinki are usually June, July, August and September.