Highest temperature in Shenzhen on July 31?

Platform comparison

Market context

Shenzhen’s top temperature on 31 July will be measured at Bao’an International Airport, and the market settles to the highest reading recorded there on the day, not a citywide average. July is normally one of Shenzhen’s hottest months, with typical highs around 31°C, while historical city data show record highs in the mid-30s Celsius rather than extreme triple-digit-style heat.[1][2][14]

The current 0% YES implies the contract is being priced as an outlier relative to the climate baseline, but the historical frame is still warm enough that a sub-30°C outcome would be notably cool for late July in Shenzhen, especially if rain or cloud suppresses daytime heating.[1][2] Comparable July profiles suggest highs commonly sit in the 31–34°C band, and recent historical examples on 31 July have still been in the low-to-mid 30s, which helps explain why any sportsbook-style line, if available, would likely sit well above a sub-30°C threshold rather than at parity.[14][20]

For traders, the main catalyst is the intraday forecast path for Shenzhen rather than any scheduled event: cloud cover, thunderstorms and heavy rainfall can materially cap the day’s maximum temperature, while a clear, humid afternoon supports a higher reading.[2][14] The key cross-platform comparison is between the market’s near-zero implied chance, the weather baseline from climatology, and any live forecast updates from major weather services; if the forecast high drifts into the low 30s Celsius, the current price would look especially compressed, whereas a wetter-than-expected day would reinforce the scepticism built into the market.[1][6][16]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets UK, which mirrors the Polymarket order book directly.

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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Best Prediction Markets UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.