Highest temperature in Shanghai on June 8?

Platform comparison

Active sub-markets

Market context

Shanghai's highest temperature on 8 June 2026 will be recorded at Pudong International Airport Station and resolved via Wunderground historical data. The market currently shows 0% implied probability across all temperature bins, suggesting either illiquidity or a data-loading issue rather than genuine consensus that no temperature will be recorded. This settlement mechanism differs notably from how Kalshi and Betfair handle weather contracts: Kalshi typically uses NOAA data for US locations and settles with tighter geographic specificity, whilst Betfair's weather markets often aggregate multiple sources and allow for dispute resolution periods. Polymarket's reliance on a single Wunderground feed creates a cleaner technical settlement but offers no fallback if that source experiences downtime on the resolution date.

Historical June temperatures in Shanghai range from 28°C to 35°C, with averages around 30–32°C. The 2025 June peak was 36.2°C; the 2024 peak was 34.8°C. These precedents suggest the market's zero probability across all bins reflects a platform-specific issue rather than meteorological impossibility. Traders comparing books should note that Smarkets and Kalshi would likely display non-zero odds across temperature ranges even in illiquid conditions, whereas Polymarket's order-book model can show empty books more readily.

The Shanghai Meteorological Bureau publishes daily forecasts through early June 2026. Traders should monitor late-May weather pattern reports from the China National Meteorological Centre, particularly any alerts for heat waves or tropical systems that could shift typical June temperatures upward or downward. The resolution window closes at 12:00 UTC on 8 June, giving traders a narrow window to verify Wunderground's data before settlement.

Methodology

This page compares Highest temperature in Shanghai on June 8? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to Polymarket Alternative UK, 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

Where can I trade this market with the lowest fees?

On Polymarket Alternative UK, which mirrors the Polymarket order book at 0% fees. 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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Alternative UK triggers a quick verification flow that finishes in minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.