Highest temperature in Shanghai on July 2?

Platform comparison

Market context

Shanghai’s July heat is notoriously intense, with daytime highs typically hovering above 30°C and extreme peaks reaching 40°C. On Polymarket today, the contract for “Highest temperature in Shanghai on July 2?” trades at 0% probability for any outcome below 30°C, reflecting the crowd’s certainty that temperatures will exceed this threshold. This pricing aligns with on-chain mechanics: USDC settlements on Polygon, conditional tokens locking in exposure, and the market’s resolution tied to Wunderground data from the Pudong International Airport Station.

Historical patterns frame this 0% pricing as rational. July in Shanghai averages 32.5°C, with the hottest day of the month reaching 32.5°C on 29 July, while extreme highs have hit 40°C in recent years [3][7]. Comparable Polymarket contracts, such as the July 3 temperature market, assign 34% probability to 30°C and 32% to 29°C, confirming that traders expect temperatures well above 30°C [1]. The current 0% probability for lower ranges is consistent with this trajectory.

Traders should monitor Shanghai’s daily weather forecasts and any official heatwave announcements from local authorities, as these can signal imminent temperature spikes. AccuWeather’s July 2026 forecast shows daily highs between 83°F and 94°F (28.3°C–34.4°C), with overnight lows of 76°F–82°F (24.4°C–27.8°C) [5]. Additionally, watch for updates from the Shanghai Meteorological Bureau, which may issue extreme heat warnings if temperatures approach 40°C, a threshold that has been recorded in past summers [6][7]. These catalysts will directly influence the market’s final resolution.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

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 PolyGram. 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'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.

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.