Highest temperature in Taipei on July 20?

Platform comparison

Market context

Taipei Songshan Airport is set to record its peak daily temperature on 20 July 2026, a date that falls within the city’s most intense summer window. Current crowd-implied probability for any specific outcome sits at 0% YES, suggesting traders see no immediate consensus on a particular range, despite historical data indicating July is the hottest month in Taipei with a daytime average high of 34°C (93°F)[2]. This divergence between the zero probability and the known seasonal heat creates a notable gap for cross-platform comparison, as sportsbook lines on similar weather contracts often reflect higher implied likelihoods for extreme heat during this period.

Historical patterns from previous July peaks show temperatures frequently exceeding 35°C, with the Taipei Songshan Airport Station consistently capturing the city’s highest readings due to its urban exposure and lack of coastal cooling. Comparable cases from 2023 and 2024 saw peaks reach 37–38°C, framing the current 0% probability as potentially underweight relative to climatological norms[2]. Traders should monitor the Taiwan Central Weather Bureau’s weekly heat advisories and Wunderground’s daily archives for RCSS, as these serve as the official settlement sources and can shift implied probabilities rapidly if forecast models update toward higher extremes.

Key catalysts include the release of the 10-day forecast from AccuWeather, which currently shows cloudy conditions with a RealFeel® of 103° and 71% humidity at the station[1]. Any sudden shift in cloud cover or wind patterns could alter the peak temperature, making the next 48 hours critical for price discovery. Analyst consensus on similar weather contracts typically adjusts upward when humidity exceeds 70%, as this traps heat and elevates daytime highs, a factor that may soon correct the current 0% implied probability if forecast data aligns with historical July trends.

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

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 Best Prediction Markets 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.