Highest temperature in Shenzhen on August 18?

Platform comparison

Market context

The market seeks to identify which temperature band will contain the highest reading at Shenzhen Bao'an International Airport on 18 August 2026, resolved against Weather Underground's Daily Observations table. The crowd currently assigns zero probability to any specific outcome, suggesting either extreme uncertainty about the resolution mechanics or insufficient trader participation at this early stage.

Shenzhen's August climate is remarkably consistent. Historical data from the past decade shows daily highs clustering between 32–35°C during mid-August, with occasional peaks reaching 36–37°C during heat waves. The city's subtropical monsoon pattern means August sits firmly within the hot, humid season, with typhoon activity occasionally suppressing temperatures. The 0% implied probability reflects the market's nascent state rather than genuine doubt about whether a temperature will be recorded; the actual uncertainty lies in which specific band will capture that maximum reading. Given Shenzhen's thermal stability in August, the consensus should favour mid-range bands (32–35°C territory) over extreme outliers, though traders should note that the resolution source specification—prioritising Daily Observations over Day High & Low summaries—introduces a technical dependency that could create discrepancies if Weather Underground's data tables diverge.

Traders monitoring this market should track tropical cyclone forecasts for late summer 2026, as typhoon activity represents the primary catalyst for temperature deviation. Any significant weather system tracking toward the Pearl River Delta in mid-August could suppress highs substantially. Until trading activity materialises, the 0% reading reflects illiquidity rather than predictive consensus, leaving room for informed positioning once comparable historical bands attract initial bets.

Methodology

This page reviews Highest temperature in Shenzhen on August 18? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Who Will Win, which mirrors the Polymarket order book at 0% fees.

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

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Who Will Win. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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%.