Highest temperature in Shanghai on August 15?

Platform comparison

Market context

Shanghai's highest temperature on 15 August 2026 will be measured at Pudong International Airport Station and resolved against Weather Underground's Daily Observations table. The crowd currently assigns zero probability to any outcome, suggesting minimal trading activity or consensus difficulty in pricing this contract ahead of the settlement window closing on 15 August 2026 at 12:00 UTC.

August temperatures in Shanghai historically cluster between 32–36°C, with occasional peaks above 37°C during heat waves. The city's summer climate is shaped by the East Asian monsoon and urban heat island effects. Comparing this market to historical volatility: Shanghai recorded 40.9°C in July 2022 and has experienced multiple days exceeding 38°C in recent summers. The zero implied probability across prediction markets suggests either insufficient liquidity, late-stage market positioning, or trader uncertainty about which temperature band will ultimately resolve. Kalshi and Polymarket show no divergent lines on this contract, indicating limited cross-platform arbitrage interest.

Traders should monitor China Meteorological Administration forecasts released in early August 2026, which typically provide 10–14 day outlooks for regional heat patterns. Tropical cyclone activity in the Western Pacific during mid-August can suppress temperatures or drive extreme heat depending on system positioning. Shanghai's air quality alerts and power grid strain reports often correlate with sustained high temperatures, offering indirect signals. The specific reliance on Weather Underground's Daily Observations table rather than summary figures introduces a technical dependency that may affect settlement interpretation if discrepancies emerge between reporting sources.

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

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.

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 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.

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.