Highest temperature in Taipei on July 20?

Platform comparison

Market context

Taipei Songshan Airport will record its peak temperature for 20 July 2026, with the market resolving to the specific Celsius range containing that high. The current crowd-implied probability of 0% for a YES outcome suggests traders believe the temperature will fall outside the offered range, a stance that diverges sharply from historical climatology where July is Taipei’s hottest month, averaging a daytime high of 34°C (93°F) [2]. This zero probability contrasts with typical sportsbook lines on similar weather contracts, which often assign non-trivial odds to extreme heat events during the summer monsoon season, highlighting a potential inefficiency where the prediction market may be underpricing the likelihood of temperatures exceeding 35°C.

Historical data from comparable July dates shows that temperatures frequently breach 34°C, making a 0% probability for a high-heat range statistically anomalous when viewed against long-term weather patterns [2]. While sportsbooks might offer balanced lines reflecting the volatility of tropical heat, the prediction market’s flat zero implies a consensus that the day will be unusually cool, a view that lacks support from recent seasonal trends. Traders should monitor the daily Wunderground history for RCSS as the primary settlement source, watching for any sudden shifts in humidity or cloud cover that could suppress temperatures below the threshold [1]. No specific weather announcements are scheduled, but the dependency on real-time station data means the market remains sensitive to micro-climatic shifts typical of the Taipei basin in late July.

Sources: 1 · 2

Methodology

We track Highest temperature in Taipei on July 20? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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 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 Kalshi vs Polymarket 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.