Highest temperature in Shenzhen on July 8?

Platform comparison

Market context

On 8 July 2026, the Shenzhen Bao’an International Airport Station will record its peak temperature for the day, a metric that determines the outcome of a prediction market where the crowd currently implies a 0% chance of any temperature above 31°C. This near-zero probability stands in stark contrast to Polymarket’s leading outcome of 31°C at 28%, revealing a meaningful divergence between the implied probability of the broader crowd and the more active traders on the platform. While sportsbooks rarely offer odds on such hyper-local weather events, the prediction-market split suggests analysts may be underweighting the historical likelihood of July highs in Shenzhen, which typically reach 89°F (32°C) as the hottest month of the year [4].

Historical data frames this current probability as potentially mispriced, given that July is consistently the hottest month at this station with an average high of 89°F, making temperatures of 30°C or 31°C statistically probable rather than anomalous [4]. Traders should monitor the morning rain and mostly cloudy conditions forecast for 7 July, which could suppress peak temperatures, but also watch for the morning thunderstorms expected on 8 July that might clear rapidly to allow a heat spike [2]. The resolution depends entirely on Wunderground’s recorded maximum for all times on the day, so any sudden shifts in wind direction or cloud cover before 12:00 UTC will be the critical catalysts [3]. Recent forecasts indicate a RealFeel of 92°F with light rain, suggesting that while clouds may limit the peak, the underlying heat potential remains significant [2].

Sources: 1 · 2 · 3 · 4 · 5

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.