Highest temperature in Shanghai on July 5?

Platform comparison

Market context

The real-world event hinges on the highest temperature recorded at Shanghai Pudong International Airport on 5 July 2026, measured in degrees Celsius. Historical data confirms July is Shanghai’s hottest month, with average highs reaching 30°C (87°F) and peaks frequently exceeding 35°C (95°F) during sunny spells[1][2]. Summer highs regularly surpass 30°C, often climbing to 35°C under clear skies[5]. Given these norms, a 0% implied probability for any specific low range appears statistically inconsistent with typical weather patterns, suggesting the market may be mispricing the baseline likelihood of extreme heat.

Traders should monitor daily weather forecasts and real-time updates from Wunderground, the official resolution source, as light rain or cloud cover could temporarily suppress temperatures[7]. Recent forecasts indicate a maximum of 31°C for the coming morning, which remains within the expected summer range but below the 35°C peak[7]. Key dependencies include wind speed, which averages 11–12 mph in July, and solar radiation, rising gradually to 5.6 kWh daily[1]. Platforms diverge significantly here: Polymarket uses decimal odds and lower fees with minimal KYC, whereas Kalshi requires strict identity verification and offers implied probability pricing, while Betfair and Smarkets employ traditional fractional odds and higher commission structures. These structural differences affect liquidity and pricing efficiency for weather-specific contracts.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Shanghai on July 5? 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 Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

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.

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. Polymarket 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.