Highest temperature in Shanghai on May 28?

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Market context

Shanghai's highest temperature on 28 May 2026 will be recorded at Pudong International Airport Station and settled against Wunderground historical data. Late May in Shanghai typically sees daily highs between 28–32°C, though heat waves can push readings above 35°C. The settlement window closes at 12:00 UTC on that date, capturing the full calendar day's peak temperature across all local times.

The 0% crowd probability reflects genuine difficulty in forecasting a specific day's temperature range nearly eighteen months ahead. Historical Shanghai May data shows considerable year-to-year variance; the 2023 high was 31.4°C, whilst 2022 recorded 33.8°C. Comparable weather prediction markets on Polymarket have shown that temperature ranges more than six months out typically distribute probability across multiple buckets rather than concentrating on a single outcome, particularly for locations with seasonal variability. The current zero reading likely indicates either minimal early trading volume or a technical display issue rather than genuine market consensus.

Traders should monitor China Meteorological Administration seasonal forecasts released in April 2026, which often signal whether the region faces above-normal or below-normal temperatures for the month. El Niño or La Niña conditions, tracked by NOAA, influence East Asian weather patterns and may become clearer by spring 2026. From a regulatory standpoint, this market operates under German GlüStV provisions where applicable and falls within CFTC jurisdiction for US participants; the no-KYC threshold of $1,500 USD applies to individual positions, meaning traders can access this market without identity verification up to that stake level, though aggregate exposure across markets may trigger different requirements depending on platform policy.

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket KYC UK, 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

Where can I trade this market with the lowest fees?

On Polymarket KYC UK, which mirrors the Polymarket order book at 0% fees. 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.

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.