Highest temperature in Taipei on July 31?

Platform comparison

Market context

Polymarket has this contract at **0% YES**, so the order book is implying the market sees no material chance that the Taipei Songshan Airport Station posts a top temperature in the relevant settlement range today. The event itself is straightforward: the highest reading recorded there on 31 July 2026, as shown by Wunderground, will decide the outcome, with settlement flowing through Polymarket’s usual USDC-denominated, Polygon-based conditional token structure.

The current pricing sits against a hot late-July backdrop rather than a cool one. Focus Taiwan reported Taipei City was under an orange heat advisory on Friday after daytime temperatures topped 36°C for a third straight day[1]. Seasonal guides for Taipei put July highs around the low-to-mid 30s Celsius, with some sources showing daily peaks near 35–38°C and historical extremes above 40°C in exceptional years[3][5][7][18]. That means a 0% quote looks less like a forecast of mild weather and more like a market statement that the relevant settlement band is already being treated as effectively locked in, or that the contract is trading at an extreme discount to the realised temperature path.

For traders, the main catalysts are the afternoon peak at Songshan Airport and any last-minute shift in the local heat pattern, cloud cover, or thunderstorm development that could blunt the maximum before the airport observation window closes. The CWA heat advisory is the key public signal to watch intraday, and fresh updates from Taiwanese forecasters can move expectations quickly when daytime temperatures are already above 36°C[1][13]. Because the outcome is tied to a single station’s official history page on Wunderground, the practical risk is less about citywide averages and more about whether the airport’s highest reading clears the relevant threshold before settlement.

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

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

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'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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Alternative UK 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.