Pronóstico: Highest temperature in Shanghai on July 8?

Platform comparison

Market context

Shanghai's summer heat peaks in early July, with daily highs typically ranging between 32–35°C at Pudong International Airport. The settlement mechanism here tracks the single highest temperature recorded across all hours on 8 July 2026, resolving to whichever bracket contains that peak reading. On Polymarket, this contract currently shows 0% implied probability across all temperature ranges, a pricing anomaly that reflects either thin liquidity or a technical lag in the interface rather than genuine market consensus that no temperature will be recorded.

Historical July data from Shanghai's meteorological station reveals consistent patterns: the past five years show daily maxima clustering between 33–36°C during the first week of July, with occasional spikes to 37°C or beyond during heat waves. The 2013 heat wave pushed temperatures to 40.8°C in early August, demonstrating that extreme outliers, whilst rare, remain within the realm of possibility. Current probability distribution across temperature brackets should reflect this baseline volatility rather than the present flat reading.

Traders monitoring this contract should track China's Central Meteorological Administration forecasts released in late June, which typically provide 10-day outlooks with reasonable accuracy for Shanghai. Typhoon activity in the Western Pacific during late June could suppress temperatures, whilst sustained high-pressure systems would elevate them. Real-time monitoring of Wunderground's historical data feed will be essential once the settlement window opens, as the platform updates hourly readings throughout 8 July.

Methodology

We track Pronóstico: Highest temperature in Shanghai on July 8? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

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 Polymarket Qué Es 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.