Highest temperature in Shanghai on July 13?

Platform comparison

Market context

Shanghai Pudong International Airport faces its peak summer heat today, with traders assessing whether the daily maximum will breach specific Celsius thresholds before the settlement window closes at noon UTC. Historical data confirms July is the hottest month, where highs regularly exceed 30°C and frequently reach 35°C during sunny spells, making a 0% implied probability for the lowest range statistically anomalous against typical climatic patterns [1][5]. The current crowd pricing suggests a potential misalignment with long-term averages, as the hottest day of the year typically occurs around July 28 with temperatures ranging from 26°C to 31°C, yet extreme spikes to 35°C are well-documented in the region’s summer climate [1][5].

Traders monitoring this event should watch real-time updates from Wunderground, the designated resolution source, for the official 13 July high reading, while noting that current forecasts for today predict a maximum of 32°C [3]. This specific market highlights a key divergence between platforms: Polymarket displays prices as implied probabilities (0% YES), whereas competitors like Kalshi or Betfair often utilise decimal odds or fractional pricing, altering how risk is perceived [4]. Furthermore, fee structures and KYC requirements vary significantly; Polymarket generally offers lower fees and crypto-native access without strict identity verification, contrasting with the regulated, fiat-heavy models of Kalshi and Betfair that demand full KYC compliance. Such structural differences mean the same 0% probability might translate to vastly different effective odds or liquidity depths across these books.

Recent heat records in Shanghai, including an all-time high of 105°F (40.6°C) recorded on July 26, underscore the volatility inherent in summer weather betting [10]. While today’s forecast sits at 32°C, the rapid increase in solar energy and growing degree days throughout July creates a high-risk environment for temperature spikes [1]. The discrepancy between the 0% market price and the historical likelihood of exceeding 30°C suggests either a liquidity gap or a specific outlier expectation unique to this platform’s user base, a phenomenon less common on deep-liquidity venues like Smarkets where arbitrage quickly corrects such mispricings.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Shanghai on July 13? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Polymarket Alternative offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.