Highest temperature in Shanghai on July 3?

Platform comparison

Market context

Shanghai’s summer heat is a defining feature of the region, with July regularly delivering highs that exceed 30°C, often climbing to 35°C under clear skies. At the Shanghai Pudong International Airport Station, the current day shows a morning thunderstorm followed by cloudy conditions, with a forecasted high of 85°F (29.4°C) and a low of 77°F (25°C) [8]. Despite the crowd-implied probability of 0% for a “YES” outcome on the highest temperature contract, historical patterns and real-time market data suggest a strong divergence: Polymarket traders assign a 42% chance to 31°C and 32% to 30°C as the frontrunners [1].

This 0% implied probability contradicts both climatic norms and active market sentiment, raising questions about whether the prediction market is mispricing a highly probable event. In comparable years, Shanghai’s July highs have consistently breached 30°C, with the hottest month averaging 87°F (30.6°C) at Pudong Airport [4]. The summer climate there regularly exceeds 30°C, reaching 35°C during the most sunny weather [6]. Such consistency makes the 0% figure an outlier, especially when contrasted with the 42% probability assigned to 31°C on Polymarket, indicating a meaningful gap between prediction-market odds and analyst consensus.

Traders should monitor incoming weather updates, particularly the timing and intensity of the morning thunderstorm and subsequent cloud cover, which could suppress or delay peak temperatures [8]. The settlement window ends on 3 July 2026 at 12:00 UTC, so any late-morning heat spike could alter the outcome. Wunderground will provide the official resolution data, recording the highest temperature for all times on this day at Pudong Airport [1]. With real-time odds shifting as traders buy and sell shares, the market reflects the latest collective view, making it essential to track live updates for any divergence from the current 0% implied probability [1].

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 Kalshi vs Polymarket, which mirrors the Polymarket order book directly.

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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Kalshi vs Polymarket. 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 vs Polymarket trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.