Highest temperature in Shenzhen on August 17?

Platform comparison

Market context

On 17 August 2026, the highest temperature recorded at Shenzhen Bao'an International Airport Station will determine the settlement outcome. The market resolves to a specific temperature range in degrees Celsius, with resolution sourced from Weather Underground's Daily Observations table rather than summary figures. Settlement occurs in USDC on btc-prediction.bet following the 12:00 UTC close of that date.

Shenzhen's August climate is remarkably consistent. Historical data from the past decade shows daily highs clustering between 32–34°C during mid-August, with extreme readings above 36°C occurring in fewer than 5% of years. The 0% crowd probability suggests traders are pricing in either an exceptionally cool anomaly or uncertainty around the specific resolution mechanics. Comparable August 15–19 periods across 2015–2024 rarely produced outliers; most years settled in the 32–35°C bands. This historical tightness constrains tail-risk pricing and explains why extreme temperature ranges command minimal implied probability.

Traders should monitor tropical cyclone activity in the South China Sea during early-to-mid August 2026, as typhoons can suppress temperatures significantly. The Western Pacific typhoon season peaks in August, and any system tracking toward Guangdong would be the primary catalyst for deviation from seasonal norms. Real-time satellite imagery and China Meteorological Administration forecasts typically become reliable 7–10 days before settlement. Additionally, verify that Weather Underground's Shenzhen Bao'an station remains the active reporting location; station changes or data gaps have occasionally triggered resolution disputes on weather markets. Cross-reference any final reading against official Shenzhen municipal weather records to confirm consistency.

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

Why USDC and not ETH or USDT?

USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.

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%.