Highest temperature in Shanghai on July 21?

Platform comparison

Market context

Shanghai is currently experiencing overcast conditions with a temperature of 82°F (approximately 28°C) at Pudong International Airport, yet the market assigns zero probability to any outcome, suggesting a potential mispricing or a misunderstanding of the settlement criteria by the crowd. Historical data for mid-July in Shanghai typically shows peak temperatures ranging between 33°C and 37°C, with the city frequently recording highs above 35°C during this period due to intense summer heat and humidity. The current 0% implied probability contradicts the established climatic pattern for late July, where temperatures in this range are statistically probable rather than impossible events.

Traders should monitor the official Wunderground daily history for ZSPD as the settlement window closes at 12:00 UTC on 21 July 2026, watching for any real-time weather updates that might indicate a cooling trend or a heat spike. While current conditions show 89% humidity and 27 mph winds which may suppress peak temperatures slightly, the seasonal baseline remains a strong indicator that temperatures will likely exceed 30°C. The primary catalyst is the final hourly reading released by the weather station before the deadline, as any significant deviation from the seasonal average would immediately invalidate the current zero-probability stance.

Sources: 1

Methodology

Sports-specific comparison page for Highest temperature in Shanghai on July 21?. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi or Manifold.

Resolution & payout

Sports markets typically settle on official final-whistle plus league confirmation. Polymarket uses UMA Optimistic Oracle with a source URL per contract — usually official league data feeds or ESPN/Soccerway. Two-hour dispute window, then smart-contract payout in USDC.

FAQ

Are prediction markets better than sports betting?

Prediction markets tend toward tighter odds than bookmakers because they use peer-to-peer exchange rather than bookmaker margin. On major matches, Polymarket quotes typically sit 2-5% closer to the true probability model than bet365 or DraftKings.

When do sports markets resolve?

Typically within hours of the official final whistle. Polymarket uses UMA Optimistic Oracle with source URLs pointing at official league data feeds — e.g. the Premier League for EPL markets, UEFA for Champions League, FIFA for World Cup.

What are live sports odds on Polymarket?

Some top-tier matches stay open during play — you can trade the half-time probability in the 70th minute. Polymarket mid-prices update second-by-second; any frontend mirroring the order book shows the same movement.

How fast do sports winnings settle?

Once the official league outcome is logged in the UMA Oracle (typically 1-2 hours after the final whistle), Polymarket's smart contract triggers USDC payout. To your wallet within minutes.

What's the difference between match odds and outright odds?

Match odds cover a single game ("Bayern beats BVB"). Outright odds are long-term aggregates ("Bayern wins the league"). Outright markets have deeper liquidity; match markets have faster resolution.