Climate in Lahti

Lahti, Finland has a subarctic climate. The annual average temperature is about -0.9°C and the city receives roughly 650 mm of precipitation across 81 rainy days a year, with around 1426 hours of sunshine. The warmest month is Jul (highs near 17.8°C) and the coldest is Jan (lows near -19.7°C). These are deterministic, latitude- and region-based planning estimates — not a forecast or measured station data; check current conditions with an official meteorological service before travel.

Data year 2025; last updated 2026-05-16.

Lahti is classified as Subarctic. This reflects its annual temperature range and the seasonal pattern of its rainfall.

Lahti receives about 650 mm of precipitation a year over roughly 81 rainy days. The wettest month is Aug and the driest is Feb.

Lahti sees an estimated 1426 hours of sunshine a year, concentrated in the warmer months around Jul.

By temperature and rainfall, the most comfortable months in Lahti are Jul, Jun, Aug. Conditions vary year to year — verify with a current forecast before booking.

Lahti has a climate comfort score of 42/100, a challenging year-round climate by this measure. The score weights mild temperatures most, then rainfall balance, sunshine, low seasonality, and the absence of extreme winter cold or summer heat.

• Climate in Helsinki — Subarctic, comfort 48/100
• Climate in Tampere — Subarctic, comfort 42/100
• Climate in Turku — Subarctic, comfort 48/100