Highest temperature in Shanghai on July 7?

Platform comparison

Market context

The underlying real-world event is the peak heat recorded at Shanghai Pudong International Airport on 7 July 2026, measured in degrees Celsius. Today, Polymarket prices the YES contract for this temperature range at 0%, implying the crowd believes the threshold will not be met. This pricing sits on the Polygon blockchain, where traders utilise USDC to buy conditional tokens that resolve based on the Wunderground data feed. The on-chain mechanics mean liquidity is thin, and the 0% price reflects a consensus that the day’s maximum will stay below the specific range required for a payout.

Historical data frames this 0% probability as a potential misreading of July’s typical intensity. Average daily highs at Pudong climb from 84°F to 88°F (29°C to 31°C) during July, rarely falling below 75°F or exceeding 95°F (35°C)[1][6]. Summer climates regularly exceed 30°C, reaching 35°C under sunny conditions[7]. Current forecasts for 7 July show a maximum of 33°C at 14:00, with humidity at 84% and light rain expected earlier[2][3]. If the day turns unexpectedly sunny, temperatures could breach 35°C, making the 0% price a risky bet against seasonal norms.

Traders must watch the hourly weather schedule and cloud cover announcements for 7 July, as clear skies are the primary catalyst for a spike above 35°C. The National Weather Service notes current clear conditions at 4:00 am with temperatures at 29.6°C, but wind gusts up to 9.9 m/s could influence heat retention[4][5]. A sudden shift in wind direction or a drop in cloud cover could trigger rapid heating. While no specific news announcement is pending, the dependency on real-time meteorological data means the settlement hinges entirely on whether the afternoon sun intensifies beyond the current 33°C forecast.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Shanghai on July 7? 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

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.

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.