**Current short-range forecast guidance from the Finnish Meteorological Institute and global models (ECMWF, Met Office) indicates a daytime maximum near 20–22 °C in Helsinki on 15 August, consistent with late-summer climatology where average highs decline from ~21 °C early in the month toward 18–19 °C by month-end.** Partly cloudy to overcast skies with light showers or sprinkles are expected under moderate southwesterly flow, limiting strong solar heating while preventing rapid overnight cooling. This places the most probable outcomes in the 19–22 °C range, where small differences in cloud timing, boundary-layer mixing, or localized sea-breeze effects can shift the recorded high by 1–2 °C. Model consensus is relatively tight at this 48-hour lead time, yet inherent uncertainty in convective timing and exact wind speeds keeps adjacent buckets (18 °C through 23 °C) competitive in trader pricing. Updated 12–00 UTC model runs and FMI nowcasts will be the key near-term catalysts.