Finland Experiences Warmer Than Average June with Regional Extremes
Finland recorded a warmer-than-usual June, with average temperatures 1–2 degrees above the long-term average across most of the country, according to data from the Finnish Meteorological Institute (FMI). The month was particularly warm in northernmost Lapland and the southwestern archipelago, where conditions were described as exceptionally warm in some areas (Helsingin Sanomat).
The average temperature ranged from around 17 degrees in southern and central Finland to approximately 10 degrees in the Käsivarsi region of Lapland. The coldest reading of the month was -2.5 degrees, recorded in Lompolonvuoma, Kittilä, on June 2. Meanwhile, the highest temperature reached 29.5 degrees at the Kärkkä observation station in Salo on June 29, just shy of the 30-degree mark (Ilta-Sanomat).
Record-Breaking Heat and Rainfall
June saw 13 hot days—defined as days when temperatures exceed 25 degrees—significantly above the average of eight for the month (Ilta-Sanomat). Despite the warmth, sunshine hours were below average across most of Finland, with totals ranging from 200 to 270 hours (Helsingin Sanomat).
While precipitation levels were largely normal in most regions, Lapland experienced unusually high rainfall. The Raistakka observation station in Posio recorded the highest monthly precipitation at 135.3 millimetres. At some Lapland stations, rainfall was classified as exceptional, meaning such levels occur roughly three times per century or less (Ilta-Sanomat). The highest single-day rainfall was 55.1 millimetres, measured in Kemie, Tohmajärvi, on June 17 (Helsingin Sanomat).
Unusual Weather Patterns
Despite the heat, thunderstorm activity was notably low. The FMI recorded approximately 6,400 cloud-to-ground lightning strikes, well below the June average of 17,600 for the period 2002–2025 (Helsingin Sanomat). The combination of warm temperatures, regional heavy rainfall, and reduced thunderstorms marked June as an atypical month for Finnish weather.