Highest temperature in Shanghai on June 23?

Platform comparison

Active sub-markets

Market context

The underlying event tracks the peak temperature recorded at Shanghai Pudong International Airport on 23 June 2026, with resolution sourced from Wunderground history. Current crowd-implied probability for the 0% YES outcome is misleading when compared against Polymarket data, where the frontrunner is 24°C at 59% and 25°C at 34%[2]. Historical averages for June at this station show daily highs increasing from 77°F to 83°F, rarely falling below 69°F or exceeding 92°F[1]. Climate records indicate the warmest June day in Shanghai reaches 30.06°C, with average highs of 25.7°C[7]. This divergence highlights how platforms like Kalshi or Betfair, which often emphasise decimal odds and strict KYC, may price risk differently than Polymarket’s implied probability model, where liquidity and fee structures drive the 24°C consensus.

Traders must monitor real-time meteorological updates and any sudden shifts in humidity or cloud cover, as these directly influence peak temperatures. Recent BBC forecasts for Shanghai show temperatures climbing to 26°C by 24 June and 28°C by 25 June, suggesting a warming trend that could push 23 June higher than current averages[3]. The settlement window ends 2026-06-23T12:00:00Z, so dependencies include the precise timing of Wunderground’s daily aggregation and potential delays in data publication. Fee structures vary significantly: Polymarket charges minimal fees with no KYC, whereas Kalshi imposes higher costs but mandates identity verification, creating a split in market participation and price efficiency. Smarkets and Betfair further diverge by offering decimal odds rather than implied probabilities, altering how traders assess the 59% chance of 24°C[2].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Shanghai on June 23? 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 Kalshi 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

Is this market available outside the US?

Kalshi Alternative UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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 Kalshi Alternative UK?

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

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

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