Highest temperature in Guangzhou on August 14?

Platform comparison

Market context

On 14 August 2026, the highest temperature recorded at Guangzhou Baiyun International Airport Station will determine the settlement outcome of this market. The resolution will draw from Weather Underground's Daily Observations table rather than the Day High & Low summary, a distinction that matters when intraday spikes occur outside peak reporting windows. USDC settlement will occur within 48 hours of the settlement window close at 12:00 UTC on that date.

Guangzhou's August climate is consistently hot and humid, with historical daily highs typically ranging between 32–35°C. The 0% crowd probability suggests traders are either awaiting range clarification or treating this as a calibration event. Comparable August readings from prior years show that extreme heat days (above 37°C) occur in fewer than 5% of cases; most August settlements cluster in the 33–35°C band. The current probability distribution may reflect uncertainty around which temperature bracket the market is actually pricing, rather than doubt about whether a high will be recorded.

Traders should monitor tropical cyclone activity in the South China Sea during early August 2026, as storm systems can suppress daytime maxima or trigger sharp intraday spikes depending on timing and track. The China Meteorological Administration's seasonal forecasts, typically released in late July, will provide guidance on monsoon intensity and heat dome positioning. Any El Niño or La Niña signals from NOAA's Climate Prediction Center in the months preceding August could shift baseline temperature expectations. Real-time weather model consensus from GFS and ECMWF data feeds will become actionable in the final week before settlement.

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

UK Frequently Asked Questions

What are crypto prediction markets?

Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.

What does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.