Highest temperature in Shanghai on June 23?

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Market context

The highest temperature recorded at Shanghai Pudong International Airport on 23 June 2026 will determine the outcome of this prediction market, yet the contract currently trades at 0% probability for the "YES" range. On Polymarket, this conditional token is priced in USDC on the Polygon network, reflecting a market consensus that the temperature will fall outside the specified bracket despite the onset of summer. The on-chain mechanics allow traders to buy or sell exposure using standard wallet interfaces, with settlement finalised once Wunderground publishes the official daily maximum.

Historical data frames this near-zero probability as a potential mispricing rather than a certainty. June at Pudong marks the start of the hot season, which runs from mid-June to mid-September, with average daily highs exceeding 80°F (27°C) [4]. Recent forecasts for June 2026 indicate daily highs ranging from 77°F to 96°F (25°C to 36°C), with summer highs regularly surpassing 30°C (86°F) and reaching 35°C (95°F) in sunny conditions [5][6]. Even the current early-morning reading shows temperatures climbing from 73°F to 75°F (23°C to 24°C) within the first hour [1], suggesting significant thermal potential before noon.

Traders should monitor the National Weather Service updates for Pudong and the BBC forecast for Hongqiao, which predicts heavy rain and a high of 24°C (76°F) for Tuesday 23 June [2]. However, the dependency on clear skies for peak temperatures is critical; if the heavy rain persists, the daily maximum may remain suppressed, validating the current 0% price. Conversely, any sudden shift to sunny weather could drive temperatures toward the 35°C upper limit, creating a sharp divergence from current on-chain pricing. The settlement window closes at 12:00 UTC, so real-time Wunderground data will be the sole catalyst for resolution.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Shanghai on June 23? 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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Scam?, 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?

Polymarket Scam? 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.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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.