Highest temperature in Shanghai on June 22?

Platform comparison

Active sub-markets

Market context

Shanghai Pudong International Airport is likely to see a summer-type high rather than an extreme spike, with June daily highs at the airport typically rising through the month and the climatological range for the month centred around the high 20s to low 30s Celsius. WeatherSpark’s June profile for Pudong shows average daily highs climbing from about 77°F to 83°F, with values rarely below 69°F or above 92°F, which puts the implied 0% YES on a very high outcome in context rather than a normal warm-day result.[1][4] AccuWeather’s June 2026 forecast for the airport points to highs of roughly 76°F to 93°F, suggesting the day’s top temperature could still finish in the upper-20s or low-30s Celsius if cloud, rain or sea-breeze effects limit heating.[5][8]

For comparison, Polymarket-style books typically quote direct implied probabilities, while Kalshi uses event prices and many UK-facing exchange markets on Betfair or Smarkets are read through decimal odds, which can make the same forecast look different even when the underlying view is similar. The market will settle on the highest temperature recorded at Shanghai Pudong International Airport Station on 22 June, so the key catalyst is the local afternoon heating cycle rather than the morning starting point; NOAA’s ZSPD timeseries shows the day’s highs are normally measured later in the day, with temperatures building from the 70s Fahrenheit in the morning towards the 80s and 90s by afternoon.[2] In practice, a trader should watch the airport forecast, any Shanghai meteorological warnings, and whether rain or thunderstorms develop, because those factors can cap the day’s maximum and matter more here than overnight conditions.[8]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Shanghai on June 22? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live quote comes directly from the Polygon order book; the other three are listed with their platform attributes — fees, KYC, settlement currency, payment options — because a 1:1 contract comparison without API access would be guesswork.

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). Kalshi Alternative UK 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 Kalshi 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.

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.

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 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 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.