Highest temperature in Shenzhen on May 31?

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Market context

On 31 May 2026, Shenzhen will be entering the early stages of its summer monsoon season, with atmospheric conditions typically favouring afternoon highs in the 28–32°C range. The market currently prices all temperature brackets at 0% probability on Polygon, suggesting either a technical listing issue or minimal liquidity in USDC-denominated conditional tokens at settlement. Traders evaluating this contract should note that Wunderground's historical data for Shenzhen Bao'an International Airport Station provides the definitive resolution source, with the settlement window closing at 12:00 UTC on the day itself—a constraint that eliminates any post-midnight temperature readings from consideration.

Historical May temperatures at Shenzhen Bao'an show a 30-year median high of approximately 30°C, with extremes ranging from 25°C in cooler years to 35°C during particularly intense heat events. The 2016 and 2020 May records both exceeded 33°C, demonstrating that whilst the modal outcome clusters around 29–31°C, tail outcomes above 33°C occur roughly once per decade. Current seasonal forecasting models from the China Meteorological Administration will become more precise by late April 2026, offering traders a clearer signal on whether late-May conditions favour the historical mean or an outlier event.

The primary catalyst affecting this contract's resolution is the timing of the southwest monsoon onset, typically occurring between mid-May and early June. Tropical cyclone activity in the South China Sea during May can either suppress temperatures through cloud cover or elevate them via pre-monsoon heat buildup. Traders should monitor the National Meteorological Centre's 10-day forecasts released in early May, as these will indicate whether blocking high-pressure systems or moisture-laden systems dominate the final week of the month.

Methodology

This page reviews Highest temperature in Shenzhen on May 31? 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

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

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.

What does it cost to trade on Kalshi UK?

Zero. Kalshi UK 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.

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.