Highest temperature in Guangzhou on August 15?

Platform comparison

Market context

On 15 August 2026, the highest temperature recorded at Guangzhou Baiyun International Airport will determine this market's outcome. The crowd currently assigns zero probability to any specific temperature range, suggesting either extreme uncertainty about which bracket will resolve or a technical pricing anomaly. Resolution hinges on the Daily Observations table from Weather Underground rather than summary figures, a distinction that occasionally produces different readings when intraday spikes occur.

Guangzhou's August climate is remarkably consistent. Historical data from the past two decades shows daily highs clustering between 32–35°C during mid-August, with extremes rarely exceeding 37°C or falling below 31°C. The city's subtropical monsoon pattern means humidity typically peaks in summer, but temperature volatility remains modest compared to inland regions. This seasonal regularity should anchor expectations; the 0% crowd probability reflects confusion rather than genuine uncertainty about whether temperatures will fall within plausible ranges.

Traders should monitor tropical cyclone activity across the South China Sea in early August 2026, as any system approaching southern Guangdong could suppress temperatures through cloud cover and precipitation. The China Meteorological Administration publishes seasonal outlooks and typhoon forecasts that would signal material deviations from the historical mean. Additionally, urban heat island effects at the airport station can amplify readings on clear, windless days—a factor worth tracking if high-pressure systems dominate the region during mid-August. Current consensus pricing suggests the market awaits clearer seasonal forecasting data before meaningful probability mass accumulates.

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

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

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.