5 hot days in Helsinki's 2026 summer, 30th of 56.
summer of 1991-20206.2
summer5
Helsinki is compared against 1991-2020, not 1961-1990. This thermometer starts in 1971, so the earlier window every other city uses would cover only its warmer final years here, and a figure against that would look like every other city's while meaning something weaker. 1991-2020 is complete for this station, so it is the one shown. The count and the rank are measured on the full record and stand.
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Hot here means 25.7 °C or above, a level about one summer day in twenty used to reach at this station between 1971 and 2000. The bar has not moved; the number of days clearing it has. Every year counted over the whole window; this season is complete, so no year is cut short. That threshold is Helsinki's own. It is not a national standard and it is not comparable with another city's: every figure on this page is measured against this station and nothing else.
The 20 °C night is a Mediterranean measure and Helsinki is outside its range. None this year, and nine nights in the whole of 1961-1990. No multiple is quoted, because dividing by a base that thin is arithmetic rather than evidence. 28 of the 54 cities are gated this way.
Helsinki's hottest day this year, 28.7 °C, is 17th on this record. The previous best is 33.2 °C in 2019, the dot on the drop line. A typical summer here peaks at 27.8 °C. Its hot-day count is 30th of 56: a count and a peak are different claims, and neither borrows the other's rank.
54 cities are measured this way, each against its own record. See them on the map