Highest temperature in Shanghai on June 4?

Platform comparison

Active sub-markets

Market context

Shanghai's highest temperature on 4 June 2026 will be measured at Pudong International Airport Station and resolved via Wunderground historical data. The settlement window closes at midday UTC on that date, creating a hard deadline for temperature recording. This market type—discrete weather outcomes across defined ranges—appears across most major platforms, though Polymarket's current 0% crowd probability suggests either sparse liquidity or genuine uncertainty about which temperature band will resolve.

Historical June temperatures in Shanghai cluster between 28–32°C as daily highs, with occasional excursions to 33–35°C during early-summer heat waves. The 2023 and 2024 June records show variability tied to monsoon positioning and subtropical pressure systems; traders comparing Polymarket's odds against Kalshi or Betfair should note that decimal odds formats on European books (Betfair, Smarkets) may render the same probability differently than Polymarket's implied percentages, potentially creating arbitrage opportunities if liquidity exists across venues. KYC requirements differ markedly—Kalshi enforces stricter US-resident verification, whilst Betfair's international reach may attract deeper Shanghai-based liquidity.

Catalysts include the China Meteorological Administration's seasonal forecasts (typically released monthly) and real-time atmospheric indices such as the East Asian summer monsoon onset timing. Late May 2026 weather models will sharpen June predictions; traders should monitor tropical cyclone activity in the Western Pacific, as systems tracking toward southern China can suppress temperatures significantly. The sparse current probability may reflect genuine forecast uncertainty rather than market dysfunction.

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

Where can I trade this market with the lowest fees?

On Polymarket 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.

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, Polymarket Alternative UK triggers a quick verification flow that finishes in minutes.