Highest temperature in Shanghai on June 27?

Platform comparison

Active sub-markets

Market context

The underlying event is the peak daytime heat recorded at Shanghai Pudong International Airport on 27 June 2026, measured in degrees Celsius and resolved via Wunderground data. Current crowd-implied probability sits at 0% for the "YES" outcome, suggesting the market expects the temperature to fall outside the specific range being traded. This zero probability diverges sharply from platforms like Kalshi or Betfair, which often display decimal odds rather than implied percentages, and where fee structures and KYC requirements can suppress liquidity on niche weather events compared to Polymarket’s more open, lower-fee model.

Historical June data for Shanghai shows daily highs typically range between 24°C and 29.7°C, with 30 June often marking the month’s peak at 29.7°C [7]. AccuWeather forecasts for June 2026 at Pudong Airport indicate highs between 80°F and 86°F (roughly 26.7°C to 30°C), rarely exceeding 92°F [2][3]. Given this consistent thermal ceiling, a 0% implied probability implies the market believes the target range is either too high or too low to be plausible, a judgment that may reflect platform-specific liquidity biases absent on Smarkets, where decimal odds better expose true disagreement among traders.

Traders should monitor the Pluvi (rainy season) intensity and any sudden convective storm announcements, as Shanghai’s June weather is dominated by humid, unstable air that can suppress peak temperatures despite high solar input [6]. Recent climate reports confirm June 2026 rainfall averages at 159mm, which often coincides with cloud cover limiting surface heating [6]. While no specific weather alert has been issued for 27 June yet, the settlement window ending 12:00 UTC means afternoon heat spikes will be excluded from the record, a dependency that platforms with real-time odds like Kalshi may price more dynamically than static implied-probability markets.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Shanghai on June 27? 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, 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). Polymarket Alternative routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Alternative, 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.

What does it cost to trade on Polymarket Alternative?

Zero. Polymarket Alternative routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

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