Highest temperature in Shenzhen on August 8?

Platform comparison

Market context

Polymarket is pricing the Shenzhen airport temperature contract at **0% YES** right now, so the on-chain USDC position is implying no meaningful chance that the Weather Underground observation table will print into the target Celsius band by settlement. The event itself is straightforward: the market resolves off the **highest temperature in the Daily Observations table** for Shenzhen Bao'an International Airport on 8 August 2026, with conditional tokens settling against that source rather than the broader headline summary.

That zero price looks at odds with the live weather picture. Weather Underground shows Shenzhen at **96°F / 84°F** around 5:39 AM CST with “today’s temperature” forecast to be nearly the same as yesterday[11], while AccuWeather’s same-day forecast has a **97°F high** and hourly values rising into the mid-to-upper 90s Fahrenheit during the afternoon[1][2]. In August, Shenzhen is typically hot and humid, with published seasonal guides putting average highs around **32°C to 35°C** and frequent rain or thunderstorm risk[13][17]. For a Celsius-resolution market, that means the relevant band is likely to hinge on whether the observed airport maximum lands near the low- to mid-30s rather than on any single headline forecast.

The main trader watchpoint is the actual airport station feed, because the market’s resolution text explicitly prioritises the **Daily Observations** table over the day-high summary. Short-term changes in cloud cover, convection, or a stray thunderstorm could cap the top reading, and Shenzhen forecasts today already include some rain risk later in the day[1][2][14]. A Polymarket user is therefore effectively trading the probability that the uploaded observation at Shenzhen Bao'an International Airport, rather than the forecast, ends up inside the settlement range by the relevant cut-off on Polygon.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Alternative UK, which mirrors the Polymarket order book directly.

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'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%.