Lowest temperature in Boston on Jun 21, 2026?

Prediction market odds reflect real-money commitments from traders who stake capital on their temperature forecasts, creating a financial incentive for accuracy. Analyst forecasts, by contrast, rely on meteorological models and expert judgment but carry no direct financial penalty for error. This market often incorporates broader data streams—seasonal trends, climate patterns, and historical June weather in Boston—faster than traditional forecasts update. Comparing the two can reveal where professional consensus and market-based predictions diverge, highlighting areas of genuine uncertainty about early summer conditions.

On Kalshi, this market is priced through an order-book mechanism where buyers and sellers submit bids and offers for shares tied to specific temperature outcomes. On Kalshi, prices reflect that venue's order book, liquidity, and how traders price the outcome right now. Traders profit or lose based on whether their chosen outcome matches the verified result, creating a direct link between price and expected probability. The spread between bid and ask reflects market confidence; tighter spreads indicate high consensus, while wider spreads signal uncertainty about where the low temperature will fall.

This market resolves around Jun 22, 2026, once June 21, 2026 has passed and the day's lowest temperature in Boston can be verified. The outcome is determined by the recorded low temperature from credible public weather sources, ensuring an objective and transparent settlement. Traders holding shares in the correct outcome band receive their payout, while incorrect positions expire worthless. The resolution window closes shortly after the market end date to allow time for final data confirmation.

Major shifts in long-range weather forecasts, particularly updates from the National Weather Service or seasonal climate outlooks, can significantly move odds in this market. El Niño or La Niña patterns, anomalous jet-stream positioning, and historical temperature anomalies for June in Boston all influence trader positioning. As spring progresses into early summer 2026, real-time forecasts issued days before June 21 will likely trigger sharp repricing. Traders also monitor broader climate trends and any unusual atmospheric patterns that might push temperatures above or below the seasonal norm for that date.