Highest temperature in Shanghai on June 23?

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Market context

On 23 June 2026, Shanghai Pudong International Airport will record its peak temperature for the day, a figure that determines the outcome of a Polymarket contract priced today at 0% YES for the highest temperature range. The market resolves via USDC on the Polygon network, using conditional tokens to settle the specific Celsius bracket once Wunderground publishes the official daily maximum.

Historical data frames this near-zero probability as a mispricing, given that June marks the start of Shanghai’s hot season, which runs from mid-June to mid-September with average highs exceeding 80°F (27°C). Climate records show daily highs in June typically climb from 77°F to 83°F, rarely dropping below 69°F, while summer peaks regularly surpass 30°C and can reach 35°C during sunny spells. The current crowd-implied probability ignores these consistent patterns, suggesting traders should scrutinise whether the 0% rating reflects a genuine cold anomaly or a market blind spot.

Traders must monitor immediate weather catalysts, particularly the heavy rain forecast for Tuesday 23 June, which could suppress temperatures, alongside the ongoing light showers observed at 1:30 am with a recorded 73°F. While AccuWeather forecasts daily highs between 77°F and 96°F for June 2026, the BBC Weather report for Hongqiao Airport indicates heavy rain and a gentle breeze, potentially lowering the Pudong maximum below expected thresholds. The settlement depends entirely on the Wunderground dataset, so any deviation in real-time precipitation or cloud cover will directly impact the final temperature range.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Is this market available outside the US?

Kalshi 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'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.

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 UK triggers a quick verification flow that finishes in minutes.