Highest temperature in Taipei on July 20?

Platform comparison

Market context

Taipei Songshan Airport is set to record its peak daily temperature for 20 July 2026, a metric that will determine the settlement of this weather contract. The underlying event is the physical measurement of the highest air temperature at this specific station, sourced directly from Wunderground history for that calendar day.

Historical data for Taipei in July shows daytime highs consistently ranging between 32 and 38°C, driven by intense humidity and six hours of daily sunshine[1]. Given this established thermal baseline, the current crowd-implied probability of 0% for the lowest temperature range suggests the market is pricing in a standard summer peak rather than an anomaly. Programmatic traders evaluating this tooling would likely back-test RCSS station logs against the 32–38°C window to validate the zero-probability stance, recognising that evening temperatures rarely drop below 27°C even after sunset[1].

Traders monitoring this settlement window should watch real-time humidity and cloud cover metrics, as these directly influence the RealFeel temperature and potential heat retention. Current conditions at the airport show 84% humidity and 91% cloud cover, which can trap heat and push recorded highs toward the upper end of the seasonal range[2]. A conditional order strategy would involve setting triggers on Wunderground’s hourly updates as the 12:00:00Z deadline approaches, ensuring execution aligns with the final verified Celsius reading before the market resolves.

Sources: 1 · 2

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

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.

FAQ

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 Fees. 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.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi Fees trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.