**Cool, unsettled conditions with thundery showers and moderate westerly winds are keeping Warsaw’s maximum temperature forecast centered on 17–18°C for June 15, 2026.** Official guidance from the BBC and Met Office highlights daytime highs of 17°C under overcast skies and showers that limit solar heating and promote mixing of cooler air. Timeanddate.com similarly shows a high near 17°C (62°F) with drizzle and overcast conditions. These factors explain why traders assign the highest implied probabilities to 18°C (45.5%) and 17°C (29.5%), consistent with ensemble model consensus and historical analogs for early-to-mid June under similar synoptic patterns. June climatology places the average high near 22–23°C, so the current setup represents a notable cool anomaly driven by a northerly or westerly flow. Low confidence in significant warming stems from the persistence of cloud cover and precipitation, which cap afternoon temperatures. Updated model runs or clearer skies could shift odds toward 19°C or higher, but recent data favor the 17–18°C range as the most likely outcome before resolution.