Highest temperature in Taipei on August 18?

Platform comparison

Market context

On 18 August 2026, the highest temperature recorded at Taipei Songshan Airport Station will fall into one of several defined ranges. In prediction markets, traders buy YES or NO shares on whether an outcome will occur; a YES share pays out if the event happens, a NO share if it doesn't. Here, YES shares correspond to a specific temperature bracket—the market's current 0% probability suggests traders believe the actual high will fall outside whichever range this particular market is testing. The resolution hinges on data from Weather Underground's Daily Observations table at the Songshan Airport station, the primary meteorological reference for Taipei, rather than summary figures elsewhere on the platform.

Taipei's August climate is consistently hot and humid, with daily highs typically ranging between 32–35°C. Historical records show that extreme heat events—temperatures exceeding 37°C—occur sporadically but are not anomalous; the city recorded 38.3°C in July 2020 and has experienced several days above 37°C in recent summers. The 0% crowd probability suggests either that traders are confident the market's specified temperature range sits well outside the expected distribution for that date, or that the range itself is positioned at an extreme tail (either unusually high or low for August). Comparing this against climatological norms for mid-August helps calibrate whether the implied probability reflects genuine scarcity or a misaligned range definition.

Traders monitoring this market should track Taiwan's weather forecasts in the week preceding 18 August, particularly any tropical cyclone activity or upper-level atmospheric patterns that could suppress or elevate temperatures. The Central Weather Administration issues detailed 10-day forecasts roughly one week ahead. Additionally, any significant El Niño or La Niña conditions affecting the Western Pacific would influence seasonal temperature patterns across Taiwan during summer 2026.

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

UK Frequently Asked Questions

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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%.