Highest temperature in Guangzhou on August 6?

Platform comparison

Market context

Guangzhou’s airport reading is sitting in a **0% YES** spot only because the market is priced for a specific outcome, not because the weather is quiet: the implied read is that traders see the listed band as effectively closed off, leaving the field to other temperature outcomes. For the underlying day, the commercial forecast still points to a hot, humid, rainy August pattern, with Guangzhou’s August highs typically around **33°C** and daily highs often in the low-30s Celsius; official Hong Kong and Guangzhou weather bulletins also show the city near **36°C** in current city forecasts, which keeps the upside temperature tail alive rather than crushed.[1][4][12][14]

On form, this looks like a **favourite/underdog** market where the favourite is still the upper-30s cluster and the underdog is a lower maximum if cloud and showers cap heating. The recent market read on Polymarket has been concentrated around **37°C** and **36°C**, and the platform notes that revisions can arrive until the next day’s first datapoint is published.[13] That makes the value question one of *precision*: if the local boundary layer mixes more weakly than expected, or if sea-breeze timing and convective bursts arrive earlier, the top-end outcome can undershoot; if sunshine persists longer, the consensus upper-30s view remains intact.[13][18]

The catalysts to watch are the same ones that usually move a temperature close: fresh model runs, official China Meteorological Administration updates, and any late-shifting rain timing over the Pearl River Delta.[13] Guangzhou’s August climatology is wet and humid, with frequent rain and high overnight moisture, so small changes in cloud cover can swing the day’s maximum by a degree or two.[2][11][12] Traders should also keep an eye on airport-station specifics, because the settlement source is Guangzhou Baiyun International Airport Station on Wunderground rather than a citywide forecast, which can leave room for a modest airport-versus-city discrepancy if local showers or outflow boundaries develop.[14]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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%.