Highest temperature in Shanghai on July 5?

Platform comparison

Market context

On 5 July 2026, the Shanghai Pudong International Airport Station will record its peak temperature for the day, a real-world event that determines the outcome of a prediction market currently implying zero probability for any specific high-temperature range. This date falls in the heart of Shanghai’s hottest month, when historical data shows daily highs typically climb between 84°F and 88°F (29°C–31°C), rarely dipping below 75°F or exceeding 95°F [1][2]. Summer conditions regularly push temperatures above 30°C, with the most sunny days reaching 35°C (95°F) [5]. The current 0% implied probability suggests the market may be mispricing the likelihood of extreme heat, given that July averages an 87°F high and is consistently the year’s peak [2].

Traders should monitor evolving weather forecasts and tropical activity, as AccuWeather predicts a p.m. thunderstorm today with temperatures near 83°F, followed by a sharp rise to 93°F on 6 July and 95°F on 7 July [4]. These spikes indicate a potential heatwave catalyst that could push the 5 July high toward the upper end of the historical range. No official announcements or scheduled dependencies are expected, but real-time updates from Wunderground—the designated resolution source—will be critical [7]. The divergence between sportsbook lines (which often price extreme heat at 10–15%) and the market’s 0% implied probability highlights a meaningful pricing inefficiency worth investigating for cross-platform odds comparison.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Shanghai on July 5? 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

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.

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.

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.