Highest temperature in Shanghai on July 13?

Platform comparison

Market context

Shanghai is currently experiencing its peak summer heat, with today’s forecast for the Pudong International Airport station indicating a maximum temperature of 32°C by 14:00 local time. The prediction market in question asks whether the highest temperature recorded on 13 July 2026 will fall within a specific range, yet the crowd-implied probability for the YES outcome sits at 0%, suggesting traders believe the event is impossible under the current contract terms. This stark divergence from the live weather data—where 32°C is already expected—raises questions about whether the market’s resolution range is misaligned with the actual forecast or if the YES condition refers to an extreme outlier that meteorologists do not anticipate.

Historical data for Shanghai in July shows that temperatures regularly exceed 30°C, often reaching 35°C during the most sunny periods, with July being the hottest month on average at 87°F (30.6°C) [3][6]. Comparable cases from recent years, including the 84°F (28.9°C) reading recorded on 13 July in past data, frame the 0% probability as potentially irrational if the YES range includes common summer highs [7]. However, if the contract defines YES as a temperature significantly above the typical 32–35°C ceiling, the zero probability aligns with the lack of analyst consensus supporting such an extreme spike, distinguishing this market from more volatile sportsbook lines where odds often reflect speculative overreactions.

Traders should monitor the official Wunderground daily history for ZSPD as the settlement source, watching for any sudden shifts in the maximum temperature reading before the 12:00 UTC settlement window closes [2]. While no specific weather announcements are scheduled for today, the dependency on real-time station data means that even minor deviations from the 32°C forecast could alter the outcome if the range is narrow. The current forecast from AccuWeather suggests daily highs between 86°F and 97°F (30–36°C) for the month, providing a clear benchmark against which to evaluate the market’s 0% implied probability [2].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Shanghai on July 13? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to PolyGram, which mirrors the Polymarket order book at 0% fees.

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 PolyGram. 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.

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.