Highest temperature in Taipei on July 20?

Platform comparison

Market context

Taipei’s highest temperature on 20 July 2026 is the real-world event this contract prices, not the abstract notion of summer heat. On Polymarket, the USDC-denominated market on Polygon currently shows the 35°C outcome at 100% implied probability, while all other ranges—including “28°C or below”—sit at 0% [1]. This pricing reflects the conditional-token mechanics where liquidity concentrates on the frontrunner, leaving no meaningful spread for alternative outcomes.

Historically, July is Taipei’s hottest month, with a daytime average high of 34°C at Songshan Airport, making 35°C a plausible but not extreme ceiling for mid-summer peaks [3]. Comparable years show that temperatures can breach 35°C during heatwaves, yet the market’s 100% assignment suggests traders view any lower reading as virtually impossible, a stance that may overstate certainty given natural variability in daily maxima.

Traders should monitor the Taiwan Meteorological Agency’s weekly heatwave advisories and Wunderground’s daily archive for RCSS, the official resolution source, as any sudden shift in forecasted cloud cover or humidity could alter the outcome [1]. A recent Accuweather report for Songshan Airport shows current conditions at 88°F with 71% humidity and 103°F RealFeel, underscoring how quickly heat indices can spike in July [2]. Watch for any official announcements on extreme-heat protocols before the 2026-07-20T12:00:00Z settlement window closes.

Sources: 1 · 2 · 3

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

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.

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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

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