Pronóstico: Highest temperature in Shanghai on June 27?

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Market context

The underlying real-world event is the peak temperature recorded at Shanghai Pudong International Airport on 27 June 2026, which historically sits between 29°C and 35°C during late June. Today, Polymarket prices this contract with a 0% implied probability for the "YES" outcome, suggesting the market believes the temperature will not breach the specific threshold defined in the conditional tokens. This pricing reflects a stark divergence from on-chain mechanics where USDC liquidity on the Polygon network typically supports more nuanced probability distributions for weather events.

Historical data frames this 0% probability as an outlier, given that daily highs in Shanghai regularly exceed 30°C in late June, often reaching 35°C under sunny conditions[5]. Average weather patterns show daily highs increasing from 77°F to 83°F (25°C to 28°C) in June, rarely falling below 69°F or exceeding 92°F[3]. Current forecasts for June 2026 indicate daily highs ranging from 80° to 86°F (27°C to 30°C), which contradicts the absolute certainty implied by the zero probability[4].

Traders should monitor the official Wunderground resolution source and local meteorological announcements for any sudden shifts in the forecast, as the settlement window ends at 12:00 UTC on 27 June. While today’s BBC forecast shows a high of 29°C with sunny skies and light winds, the rapid transition into the hot season starting 17 June means temperatures could spike unexpectedly[1][6]. The dependency on the specific station data at ZSPD requires watching for any discrepancies between the Hongqiao and Pudong readings, as regional variations can alter the final outcome significantly[2].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Pronóstico: Highest temperature in Shanghai on June 27? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

On PolyGram, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

PolyGram is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

What does it cost to trade on PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.