Highest temperature in Shanghai on May 28?

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Market context

Shanghai's weather on 28 May 2026 will determine which temperature band captures the day's peak reading at Pudong International Airport. Late May sits squarely in Shanghai's transition toward summer, when daily highs typically range between 28–32°C, though heat waves can push readings several degrees higher. The 0% crowd probability suggests traders are either uncertain about the resolution mechanics or treating this as a placeholder market awaiting clearer odds distribution across temperature brackets.

Historical May data from Shanghai shows considerable year-to-year variance. The city has recorded May highs ranging from the low 20s during cooler springs to 35°C during anomalous heat events, though readings above 33°C remain less frequent than moderate warmth in the 28–31°C band. Comparable late-May periods typically see humidity rising alongside temperature, with afternoon thunderstorms occasionally capping daily maxima. The current flat probability structure reflects genuine uncertainty rather than consensus conviction around any single outcome.

The settlement window closes at midday on 28 May, creating a timing dependency: Wunderground's historical records must capture the full calendar day's peak, meaning any late-afternoon spike after the market closes would still count toward resolution. Traders should monitor seasonal forecasts from China's meteorological authority and watch for any announced heat advisories in the week preceding the date. Tropical systems tracking toward East Asia in May could suppress temperatures, whilst high-pressure systems anchored over the region would favour above-average readings.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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 it cost to trade on Who Will Win 2026?

Zero. Who Will Win 2026 routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.