Highest temperature in Taipei on August 20?

Platform comparison

Market context

On 20 August 2026, Taipei will experience peak summer heat, and this market captures the single highest temperature reading recorded at Songshan Airport Station that day, measured in Celsius. The resolution hinges on Weather Underground's Daily Observations table rather than the Day High & Low summary—a distinction that matters for traders building automated feeds, as the two sources occasionally diverge by tenths of a degree depending on observation timing and station calibration. For programmatic resolution, you'll need to query Wunderground's historical data API directly and cross-reference the timestamp of the maximum reading against the settlement window closing at 12:00 UTC on 20 August.

Taipei's August temperatures cluster reliably between 32–36°C, with historical extremes reaching 37–38°C during particularly intense heat waves. The 0% crowd probability suggests the market may be miscalibrated or reflect low liquidity rather than genuine forecast confidence. Comparable August days at Songshan show that readings above 35°C occur in roughly 60–70% of years, whilst 37°C+ occurs in perhaps 15–20% of years depending on monsoon patterns and Pacific typhoon activity that month.

Traders should monitor the Western Pacific typhoon forecast from late July onwards—tropical systems either suppress peak temperatures through cloud cover or intensify heat through atmospheric pressure changes. The Japan Meteorological Agency's seasonal outlook and any issued heat advisories from Taiwan's Central Weather Administration in early August will signal whether conditions favour the upper or lower end of the typical range. Real-time feeds from Wunderground's station network should be queried continuously from 06:00 to 18:00 local time on the day itself to capture the actual maximum.

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

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 Polymarket Review UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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%.