Highest temperature in Shanghai on June 4?

Platform comparison

Active sub-markets

Market context

Shanghai's daily maximum temperature on 4 June 2026 will be recorded at Pudong International Airport Station and settled against historical data from Wunderground. Early June in Shanghai typically falls within the pre-monsoon transition period, with daily highs ranging between 28–32°C as the city moves toward summer. The 0% crowd probability suggests either extreme confidence in a specific temperature band or minimal trading activity on this particular market variant.

Historical June temperatures at Shanghai Pudong provide a useful baseline. Over the past decade, early June maxima have clustered around 29–31°C, with occasional spikes to 33–34°C during early heat waves. The settlement mechanism—using Wunderground's recorded high for the full calendar day—differs from some competing platforms' approaches to weather resolution. Kalshi and Betfair sometimes employ alternative meteorological sources or time-window specifications, which can create pricing divergences on identical underlying events. Polymarket's reliance on Wunderground aligns with broader transparency standards but traders should verify source accessibility given occasional data delays in historical records.

Traders monitoring this market should track late May weather patterns and any atmospheric pressure systems moving toward eastern China in early June. The China Meteorological Administration typically issues extended forecasts by late May; these announcements often shift market pricing on temperature ranges. Seasonal typhoon activity, whilst rare in early June, can suppress temperatures if systems approach the region. Liquidity on narrow temperature bands remains thin across most platforms, meaning wide bid-ask spreads are common and execution costs may exceed expected value on marginal positions.

Methodology

We read Highest temperature in Shanghai on June 4? 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

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?

Polymarket Alternative 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 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.

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.