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 resolved against Wunderground historical data. The market currently prices all temperature ranges at 0% probability on Polygon, suggesting either a technical settlement issue or extremely early-stage liquidity. Traders holding conditional tokens for this contract are betting on specific Celsius bands, with USDC collateral locked until the settlement window closes at midday UTC on 28 May.

Historical May temperatures in Shanghai cluster between 25–32°C, with occasional peaks above 33°C during warm years. The city's subtropical climate typically produces humid conditions by late May, though year-to-year variation remains substantial. Comparable May 28 readings from prior decades show the 28–31°C range has occurred most frequently, whilst extremes above 34°C or below 24°C are rare but documented. Current zero probability across all bands suggests the market has not yet attracted substantive trading activity or faces data feed delays.

Traders should monitor China Meteorological Administration forecasts released in early May 2026, which typically provide ten-day outlooks with reasonable accuracy for Shanghai. El Niño or La Niña conditions active during spring 2026 could shift seasonal temperature patterns; the China National Climate Center publishes seasonal outlooks quarterly. Wunderground's historical database occasionally experiences minor reporting delays, though Pudong Airport maintains consistent automated station records. Settlement hinges entirely on the single highest temperature recorded across all daylight and overnight hours on that date.

Methodology

This page reviews Highest temperature in Shanghai on May 28? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Kalshi UK — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On Kalshi 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.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Kalshi UK triggers a quick verification flow that finishes in 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.