Highest temperature in Shanghai on June 29?

Platform comparison

Market context

The underlying event is the highest temperature recorded on 29 June 2026 at Shanghai Pudong International Airport, measured in degrees Celsius. Historical data shows June highs at this station typically range from 77°F to 83°F (25°C to 28°C), rarely falling below 69°F (20°C) or exceeding 92°F (33°C) [1]. Summer conditions in Shanghai regularly exceed 30°C (86°F), reaching 35°C (95°F) during peak sunshine [5]. Given this consistent thermal baseline, the current crowd-implied probability of 0% for a specific high-temperature range appears misaligned with seasonal norms, suggesting either a misunderstanding of the resolution criteria or a market inefficiency. Traders comparing platforms should note that Polymarket displays decimal odds while Kalshi and Betfair emphasise implied probability, and fee structures vary significantly between these books, with KYC requirements differing in reach [1].

Key catalysts include the onset of the East Asian rainy season and potential typhoon activity, which can suppress temperatures through cloud cover and precipitation. Recent forecasts for 29 June indicate light rain and a gentle breeze with temperatures around 29°C at Hongqiao, a nearby station, though Pudong may differ slightly due to coastal exposure [2]. A trader must monitor the National Weather Service updates for Pudong, as wind speeds remain constant near 11.3 mph, limiting convective cooling [1]. The resolution source is Wunderground, which aggregates hourly data; any discrepancy between forecast models and actual station readings could create arbitrage opportunities. Smarkets and Betfair diverge on fee structures, with Smarkets offering lower maker fees, while Kalshi requires strict KYC, impacting liquidity for international participants [1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Shanghai on June 29? 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, 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 has a different geo footprint and routes to Polymarket's order book at 0% fees.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.