Highest temperature in Taipei on August 9?

Platform comparison

Market context

Taipei’s weather has shifted towards a wetter, less sun-driven setup in the last 24–48 hours, with forecast sources pointing to showers, thunderstorms and heavy rain rather than the clear-sky heat that usually pushes August maxima higher. Weather Underground’s resolution source is the Taipei Songshan Airport Station daily observations table, so the trade is less about the headline “feels like” readings and more about whether cloud cover and rain keep the recorded peak inside the low-30s or pull it down towards the high-20s.[1][10][13][14]

That framing makes the current 5% YES price look conservative only if traders expect a genuine break from the forecast pattern. August in Taipei is normally very hot and humid, with typical highs around 33–34°C, but recent market pricing has leaned towards 27–29°C because official and commercial forecasts both describe unsettled weather. The market’s own history matters too: a similar Taipei temperature contract resolved to 37°C earlier in the week when the city broke hotter than expected, showing how quickly these ranges can move if cloud and rain underperform.[1][5][15][17]

The main catalysts are the morning-to-afternoon evolution of rainfall, any updated Central Weather Administration guidance, and whether Songshan Airport records a brief clearing spike before convection rebuilds. Traders should watch the hourly forecast updates and local observations rather than the day’s summary high, because the contract resolves on the observations table, not the day-high synopsis. If showers persist through the peak heating window, the top reading is more likely to sit near the market’s current 28°C focal point than to challenge the upper outcomes.[1][13][14]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Taipei on August 9? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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%.