Highest temperature in Taipei on August 9?

Platform comparison

Market context

Polymarket currently prices the contract as a low-probability move, with **28°C** the leading outcome at **37.3%** and the market implying only **4%** for **YES** on the broader event structure. Because this market settles off the **Daily Observations** table for Taipei Songshan Airport on Weather Underground, not the headline Day High & Low summary, traders need to watch the intraday recorded maximum rather than the displayed daily summary figure; shares are standard conditional tokens on Polygon, bought and sold in USDC, with the correct band redeemable for $1 at resolution.[1]

That pricing sits in range with how Taipei usually behaves in August, when highs often cluster in the low-30s Celsius rather than pushing far above them. The current crowd favourite around 28°C reflects a day where cloud, rain and thunderstorm coverage can cap insolation and suppress the afternoon peak; comparable weather services for Taipei on 9 August point to rain and highs around 30–31°C, which helps explain why the market’s centre of gravity is below the hotter outcomes.[1][3][12] A resolved August temperature market on 5 August also shows how quickly these contracts can settle once the recorded maximum is known, reinforcing that the final print from the station matters more than the day’s general feel.[17]

For traders, the main catalysts are the latest Taipei forecast updates, rainfall intensity, and any shift in storm timing before the midday settlement window closes. Weather Underground’s station history will ultimately decide the winner, but near-term pricing can react to updated forecast models, central weather guidance, and live radar if convection clears or intensifies around Songshan Airport. AccuWeather and other forecast services currently show temperatures near the low-30s with rain risk, which is enough to keep the contract sensitive to any brief warm-up if cloud cover breaks earlier than expected.[2][10][13]

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 Kalshi UK. 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%.