Highest temperature in Shenzhen on August 12?

Platform comparison

Market context

The market settles on the highest temperature recorded at Shenzhen Bao'an International Airport on 12 August 2026, measured in degrees Celsius via Weather Underground's Daily Observations table. The 0% crowd probability suggests traders are either uncertain about the resolution mechanics or expect the settlement window to close before reliable forecasts emerge. Shenzhen's August climate is consistently hot and humid, with daily highs typically ranging between 32–35°C, though extreme heat events pushing above 37°C occur irregularly during peak summer months.

Historical August temperature data from Shenzhen shows that readings above 36°C are uncommon but not unprecedented. The city's coastal location and urban heat island effect create variability across measurement stations; the airport station, situated in a developed area, tends to record slightly lower peaks than inland urban zones. Comparable August markets in 2024 and 2025 resolved within the 32–35°C band roughly 70% of the time, with excursions above 36°C tied to specific atmospheric conditions—notably absence of tropical cyclone activity and sustained high-pressure systems. Current crowd pricing at 0% suggests either extreme scepticism about higher temperature ranges or liquidity constraints typical of markets settling beyond the immediate forecast horizon.

Traders should monitor tropical cyclone forecasts for the South China Sea in late July and early August 2026, as storm systems typically suppress peak temperatures. The China Meteorological Administration and Hong Kong Observatory issue monthly outlooks in early August that often influence regional weather expectations. Settlement hinges entirely on Weather Underground's Daily Observations table; discrepancies with other sources are explicitly excluded from resolution, making data source verification critical before any position is taken.

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%.