**Current forecast models indicate a minimum temperature in Helsinki on October 12 most likely between roughly 4–6°C, driven by northeasterly flow, persistent cloud cover, and light rain or showers that limit overnight radiative cooling.** Multiple sources, including Yr.no, globalmeteo, and WeatherBug, project overnight lows around 5–6°C (41–43°F) with daytime highs near 8–9°C under overcast skies and northeast winds of 10–18 km/h. This aligns closely with the 1991–2020 climatological average low of 4.9°C for the date. Persistent moisture and cloudiness prevent temperatures from falling toward freezing, while the lack of strong southerly flow or clear skies keeps the minimum well below 10°C. The near-even market-implied odds between “0°C or below” and “10°C or higher” reflect the narrow range of plausible outcomes around the expected 4–7°C band, where small shifts in model guidance, wind speed, or precipitation timing can move the exact minimum by a degree or two. Historical records show October 12 lows have ranged from −4.6°C to 11.2°C, but recent model consensus and the current synoptic pattern strongly favor the middle of that distribution. Updated runs from official meteorological agencies will provide the next key data points for resolution.