Highest temperature in Shenzhen on July 25?

Platform comparison

Market context

Shenzhen's peak temperature on 25 July 2026 will be measured at Bao'an International Airport Station and resolved against historical weather data from Wunderground. July is consistently the hottest month in Shenzhen, with daily highs typically ranging between 32–35°C, though extreme heat events can push readings above 37°C. The settlement window closes at midday on the resolution date, meaning only temperatures recorded up to that point will count towards the final outcome.

Historical patterns show Shenzhen experiences monsoon-influenced summer conditions during late July, with high humidity and frequent afternoon thunderstorms that occasionally moderate peak temperatures. Over the past decade, 25 July readings at Bao'an have clustered in the 33–35°C band, with only occasional excursions above 36°C during particularly intense heat waves. The 0% crowd probability suggests traders are pricing in either extreme confidence in a specific temperature range or significant uncertainty about which bracket will resolve.

The primary variable affecting this outcome is the timing and intensity of the East Asian summer monsoon system in late July 2026. Tropical cyclone activity in the South China Sea during the week preceding 25 July could introduce cloud cover and precipitation that suppresses peak temperatures, whilst a high-pressure ridge over southern China would favour clear skies and stronger solar heating. Current seasonal forecasts from meteorological services will become more precise as July approaches, providing traders with updated atmospheric pattern guidance roughly two weeks before settlement.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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. 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 does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.