Highest temperature in Shanghai on May 29?

Platform comparison

Active sub-markets

Market context

Shanghai's weather on 29 May 2026 will determine which temperature bracket captures the day's peak reading at Pudong International Airport. The settlement mechanism relies on Wunderground's historical weather database, which records hourly observations and derives daily highs from the official station feed. This specificity matters: different weather stations within Shanghai can report variations of 1–2°C, and Wunderground's data occasionally lags or requires manual correction for extreme events, creating settlement ambiguity that traders must account for.

Late May in Shanghai typically sees temperatures between 28–32°C as the city transitions into early summer monsoon patterns. Historical data from 2015–2024 shows 29 May highs clustering around 29–31°C, with outliers reaching 33°C during heat waves and dipping to 25°C in cooler years. The 0% crowd probability across major platforms—Polymarket, Kalshi, and Betfair—suggests either extremely tight range definitions in the market's upper brackets or minimal liquidity, a common pattern for hyper-specific weather markets where decimal odds on Betfair and Smarkets often compress into near-zero territory for tail outcomes. Kalshi's regulated US-focused offerings typically exclude international weather contracts, whilst Polymarket's broader catalogue captures this event despite lower trading volumes.

Traders should monitor China Meteorological Administration forecasts released in early May, which typically project 10–14 day outlooks with reasonable accuracy for Shanghai. Tropical cyclone activity in the Western Pacific during late May could suppress temperatures or trigger sudden spikes; the 2020 and 2022 seasons saw unusual volatility during this window. Settlement hinges entirely on Wunderground's data pull—no alternative sources are specified—making platform uptime and data-feed reliability material risks that distinguish this contract from standardised temperature markets.

Methodology

This page compares Highest temperature in Shanghai on May 29? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Is this market available outside the US?

Polymarket Alternative is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Alternative 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.