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Finland summer weather summary and autumn transition

Updated 6 times since CLSTR started tracking revisions of this situation.

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2026-09-12 05:37 UTC → 2026-09-26 16:23 UTC · added removed

Retrospective data from the Finnish Meteorological Institute confirms that August temperatures remained near normal, broadly 0–1 degree Celsius warmer than the long-term average. However, many residents perceived the season as cooler due to a lack of extended heatwaves; August recorded only three heatwave days (exceeding 25 °C), which was six days fewer than the historical average. The highest temperature in August was 26.6 °C, recorded on the 15th at the Salo Kärkkä and Turku airport stations, while the summer peak of 31.1 °C occurred on July 12 at Pyhtää airport. Precipitation was highly variable. August was wetter than usual in central regions, extending from Southern and Western Lapland, with the highest rainfall of 189.2 mm recorded at the Tornio Kaakkuri station. Conversely, parts of Southern and Western Finland, as well as Eastern Lapland, saw less rainfall than normal, with a low of 11.9 mm at Uusikaupunki Itätulli. Lightning activity was also notably lower than average, with approximately 8,400 strikes compared to the typical 21,000. As of early September, Finland autumn progresses, the weather outlook has experienced an unusually quiet year regarding severe weather. Meteorologist Sara Salonen shifted toward unseasonably warm conditions for late September. Duty meteorologist Jani Sorsa reports that only four storm days have been recorded so far, significantly below temperatures in southern Finland are forecast to rise between 15 and 20 degrees Celsius during the 20-year annual average of 29. Thunderstorm activity is also remarkably low; approximately 28,000 cloud-to-ground lightning strikes have been observed this year, which is only a fraction final week of the typical annual range of 80,000 to 130,000. Experts attribute this lack of activity month. In northern Finland, temperatures are expected to persistent high-pressure systems reach between 10 and North Atlantic airflows that prevented the development 15 degrees Celsius. While rain may persist in eastern areas from Kainuu to Eastern Lapland through Sunday, most of necessary moisture and heat for major storms. As autumn progresses, Finland the country is expected to experience a significant drop in temperatures see clear and increased precipitation. Meteorologist Joanna Rinne reports that a high-pressure ridge will initially sunny conditions. A single rain area may bring clear but very cold conditions, with frost anticipated in windy conditions to central and potentially southern northern parts on Tuesday, but high pressure is expected to peak mid-week, leading to drier and sunnier weather toward the end of the country. week.

Versions

  1. 2026-09-26 16:23 UTC Finland summer weather summary and autumn transition
  2. 2026-09-12 05:37 UTC Finland summer weather summary and autumn transition
  3. 2026-09-08 02:55 UTC Finland summer weather summary and autumn transition
  4. 2026-09-01 20:07 UTC Finland summer weather outlook and seasonal summary
  5. 2026-08-11 15:35 UTC Finland summer weather outlook
  6. 2026-08-09 16:16 UTC Finland summer weather outlook
  7. 2026-08-03 12:14 UTC Finland summer weather outlook

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