Highest temperature in Shenzhen on August 15?

Platform comparison

Market context

Shenzhen's highest temperature on 15 August 2026 will be measured at Bao'an International Airport Station and recorded in Weather Underground's Daily Observations table, with settlement determined by that primary source rather than the Day High & Low summary. The market currently prices this contract at 0% implied probability across all temperature ranges, reflecting either extreme confidence in a specific outcome or minimal trading activity establishing a floor price on Polygon's USDC rails.

August temperatures in Shenzhen cluster reliably between 32–35°C, with historical data from the past decade showing the 15th specifically averaging around 33–34°C. Extreme heat days exceeding 36°C occur roughly 5–10% of the time during peak summer months, whilst readings below 30°C are exceptionally rare in mid-August. The 0% crowd probability suggests traders may be anchored to a narrow band based on seasonal norms, leaving tail outcomes—both unusually cool and significantly hot—potentially mispriced relative to actual meteorological variance.

Traders monitoring this contract should track tropical cyclone activity in the South China Sea during early-to-mid August, as storm systems can suppress temperatures markedly or, conversely, drive humidity and heat indices higher. China's meteorological forecasts typically become reliable 10–14 days ahead; Weather Underground's station data updates daily, allowing real-time verification against forecast models. Any significant weather system affecting the region in the fortnight before settlement would shift conditional token valuations materially, as would unexpected urban heat-island effects from construction or infrastructure changes near the airport monitoring station.

Methodology

We track Highest temperature in Shenzhen on August 15? 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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

UK Frequently Asked Questions

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.

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%.