Highest temperature in Shanghai on July 11?

Platform comparison

Market context

Shanghai faces its peak summer heat on 11 July 2026, with the Shanghai Pudong International Airport Station expected to record daily highs well above 30°C. Historical data confirms July is the city’s hottest month, where temperatures routinely exceed 35°C and occasionally reach 38°C, making a 0% crowd-implied probability for any specific range highly anomalous given the climate reality [3][6].

Past July records show highs consistently hovering between 30°C and 38°C, with 2025 specifically hitting 38°C at the same location [6]. The current zero probability suggests a market error or a misunderstanding of the settlement terms, as comparable cases from Weather Spark and AccuWeather indicate daily highs rarely fall below 26°C in mid-July [1][5]. Traders comparing platforms should note that Polymarket displays implied probabilities while Kalshi uses decimal odds, creating a friction point when interpreting such extreme divergences from historical norms.

Key catalysts include the hourly forecast for Saturday 11 July, which predicts a maximum of 30°C with partly cloudy skies and light precipitation [10]. While thunderstorms are possible, the prevailing south-east winds and high solar energy levels typically drive temperatures upward [1]. Fee structures and KYC requirements further differentiate these books; Kalshi’s strict identity verification contrasts with Polymarket’s crypto-native access, potentially affecting liquidity depth on weather contracts where institutional traders favour regulated venues.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Shanghai on July 11? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi Alternative UK, which mirrors the Polymarket order book at 0% fees.

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

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 is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Kalshi Alternative UK has a different geo footprint and routes to Polymarket's order book at 0% fees.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi Alternative UK 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.