Highest temperature in Shanghai on June 29?

Platform comparison

Market context

The underlying event is the highest temperature recorded on 29 June 2026 at Shanghai Pudong International Airport, a date that historically sits within the city’s peak summer heating window. Current crowd-implied probability of 0% for any specific high-temperature range suggests the market views the outcome as either impossible or so uncertain that no range commands confidence, a stark divergence from sportsbook lines that typically assign measurable odds to similar weather contracts. Analyst consensus on comparable June contracts usually places the likely high between 30°C and 35°C, yet the prediction market’s zero probability implies a unique disconnect, possibly driven by settlement mechanics or data-source ambiguities rather than meteorological reality.

Historical data frames this probability sharply: June highs at Pudong average 27°C to 29°C (80°F–85°F), rarely falling below 21°C (69°F) or exceeding 33°C (92°F), with summer peaks regularly surpassing 30°C and reaching 35°C under intense sun[1][5]. Comparable cases from recent years show that even on rainy days like today’s forecast of light rain and 29°C, temperatures can rebound quickly, making a 0% probability for any range highly anomalous unless the market anticipates a data gap or instrument failure[2][6]. Traders should watch for Wunderground’s daily update schedule, any official announcements from the Shanghai Meteorological Bureau regarding sensor recalibration, and the timing of the settlement window ending 12:00 UTC, as dependencies on real-time data ingestion could invalidate ranges if updates lag[3][7]. A recent BBC forecast confirms light rain and 29°C for 29 June, yet this does not preclude a higher peak later in the day, underscoring why the zero probability may reflect market mechanics rather than weather impossibility[2].

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

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 PolyGram. 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.

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 PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.