Recent model consensus from sources including the Finnish Meteorological Institute and ECMWF places Helsinki’s August 28 high near 19–20 °C, consistent with the month’s climatological average of 18.7 °C and typical Baltic Sea moderation that limits extremes. Light winds, variable cloud cover, and a low-probability shower (20–50 % chance) introduce 1–2 °C uncertainty in the afternoon peak, while the sea’s thermal inertia and declining solar angle keep values well below late-July maxima. With all listed thresholds priced near 50 %, traders are reflecting genuine forecast spread two days out rather than any dominant warm or cool signal, underscoring how small shifts in timing of clearing skies or onshore flow can move the daily maximum across several bins. Updated guidance expected within 24 hours will likely tighten these ranges.