Highest temperature in Taipei on July 31?

Platform comparison

Market context

Taipei Songshan Airport’s final high for 31 July will be set from the Wunderground daily history page, so a programmatic approach should treat the market as a single observed daily maximum rather than a forecast of the afternoon temperature path. At 10:00 UTC, the crowd price of 0% for YES is hard to square with current conditions: Focus Taiwan reported Taipei above 36°C on Friday morning, with the Central Weather Administration issuing an orange heat advisory after three straight days above that level.[1]

For context, late-July Taipei is normally hot enough that 33–35°C daily highs are common, and several climate summaries put July averages around 33–35°C with occasional extremes into the high 30s.[3][11][13] That means the resolution bands most traders will care about are clustered around the usual summer peak rather than near cooler months; for bots, the useful task is to map live station readings to the market’s discrete temperature buckets and update probabilities only when the airport station’s official high materially shifts. Recent Taiwan reporting also shows Taipei has been capable of reaching 38°C-plus during heat events, which matters when setting upper-tail probabilities, but the market only needs the single highest reading recorded before the settlement window closes.[1][9]

The main catalysts are the midday-to-afternoon heat peak, any Central Weather Administration advisories, and whether showers or cloud build-up suppress the airport’s maximum before local evening. In practice, traders watching this programmatically would monitor the station feed cadence, compare it with nearby city forecasts, and look for any late-day revision in the daily high before the 12:00 UTC cutoff; if the current heat pattern persists, the low 30s to mid-30s remain the relevant range, while an unexpected thunderstorm would pull the print down faster than headline city averages suggest.[1][2][7]

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

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.

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 Bot 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.

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.

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.