Highest temperature in Shenzhen on August 12?

Platform comparison

Market context

Shenzhen will experience peak summer heat on 12 August 2026, and this market captures whether the highest temperature recorded at Bao'an International Airport will fall within a specific range. The settlement mechanism relies on Weather Underground's Daily Observations table rather than the summary Day High & Low section—a distinction that matters when automated systems query the API or scrape historical data. Traders building conditional orders or bots should note this source hierarchy; discrepancies between the two tables are possible and the primary source is explicitly defined.

August temperatures in Shenzhen cluster reliably between 32–35°C, with extremes occasionally reaching 36–37°C during particularly intense heat waves. The 0% crowd probability suggests the market may be pricing in either a narrow range that excludes typical August highs, or reflects low liquidity rather than genuine conviction about weather outcomes. Historical data from the China Meteorological Administration shows Shenzhen's August average high sits around 32.5°C, with the 90th percentile near 34°C; traders evaluating this market should cross-reference multi-year records to calibrate their own range estimates.

Monitoring tropical cyclone activity in the South China Sea through early August will be the primary catalyst affecting temperature trajectories. The China Meteorological Administration issues typhoon forecasts weekly; any system tracking toward Guangdong province could suppress daytime highs through cloud cover and precipitation. Traders with programmatic access to real-time weather models (GFS, ECMWF) can update conditional orders as the settlement date approaches, since August forecasts typically stabilise only 10–14 days prior.

Methodology

We track Highest temperature in Shenzhen on August 12? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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 Kalshi Fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi Fees trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.