Highest temperature in Shanghai on July 17?

Platform comparison

Market context

Shanghai’s July heat is notoriously intense, with the city routinely recording highs above 35°C during midsummer. Historical data shows that 17 July has frequently seen peak temperatures between 34°C and 38°C at the Pudong International Airport station, making a 0% crowd-implied probability for any specific high-temperature range appear mispriced relative to climatic norms [1]. The current pricing suggests traders are either betting on an extreme cool anomaly or have misunderstood the market’s binary structure, where “YES” likely refers to a specific threshold rather than the event occurring at all.

On Polymarket, this contract trades as a conditional token on Polygon, settled in USDC, where buyers speculate on whether the day’s maximum temperature falls within a defined bracket. The 0% YES price implies the market expects the temperature to fall outside the offered range entirely, which contradicts typical July patterns in Shanghai. Traders should monitor daily Wunderground updates for the Pudong station, as resolution hinges solely on that source’s recorded maximum for 17 July 2026. No official weather announcements are expected to alter the outcome, but sudden rain or cloud cover could temporarily suppress temperatures, though rarely below 30°C in this period [1].

Given the settlement window ends at 12:00 UTC on 17 July 2026, the final temperature will be locked in by midday local time. The lack of movement in the YES probability suggests low liquidity or a consensus that the range is unattainable, yet historical comparables indicate such a stance is statistically fragile. Watch for real-time Wunderground data releases as the primary catalyst, since no external policy or forecast changes will override the observed measurement.

Sources: 1

Methodology

We track Highest temperature in Shanghai on July 17? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Kalshi UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.