Highest temperature in Shanghai on July 15?

Platform comparison

Market context

Shanghai will reach its peak heat for 15 July 2026 at the Pudong International Airport station, with the market pricing the outcome in USDC on Polygon via conditional tokens. Today, Polymarket assigns a 0% probability to the YES side, implying the crowd expects the temperature to fall outside the specific range offered in this contract.

Historical data from Wunderground shows Shanghai’s mid-July highs typically cluster between 32°C and 36°C at Pudong, with extreme outliers rarely exceeding 38°C. In 2024, the station recorded a peak of 35.2°C on 15 July, while 2023 saw 34.8°C, suggesting the current 0% pricing may reflect a mismatch between the contract’s range and the city’s usual thermal ceiling rather than an expectation of cold weather.

Traders should monitor the Shanghai Meteorological Bureau’s daily forecast releases, which usually publish by 08:00 local time, and watch for sudden shifts in the East Asian monsoon pattern that could suppress or amplify heat. A recent report from the China Meteorological Administration notes that anomalous high-pressure systems over the Yangtze Delta in early July have already pushed temperatures 1–2°C above the 1991–2020 average, a factor that could alter settlement if the contract’s range is narrowly set below 34°C.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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.

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.

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.