Highest temperature in Shanghai on August 6?

Platform comparison

Market context

Shanghai’s late-summer heat normally puts the airport’s daily maximum in the low-to-mid 30s Celsius, with August averages around 31–32°C and long-run highs often clustered near 34–35°C. Recent forecast vendors are not aligned, but they all point to a hot day rather than a cool one: one August outlook shows 6 August at about 35°C/26°C, while another daily forecast prints 34°C with highs near 35–37°C in the same period.[2][3][13][15] For a market that settles on the *highest* temperature logged at Shanghai Pudong International Airport Station, that means the practical question is whether the eventual peak clears the low-30s band or prints something closer to the upper-30s outlier seen in some Shanghai summers.[10]

For trading and tooling, the cleanest approach is to treat this like a programmable range check against the Wunderground history page and the weather API or scraper you already use for other event-driven books. Because settlement depends on the station’s recorded daily maximum, not a city-wide average, you want updates that track intra-day heating, cloud cover, rain timing, and any abrupt convection that could lift the max into a higher bracket before the 12:00 UTC settlement cutoff. Shanghai’s August profile is humid and rain-prone, with around 11 rainy days and roughly 136 mm of monthly rainfall in common climatology, so midday shower timing can matter as much as the morning baseline.[3][9][15] There are no obvious structural dependencies beyond the local forecast and the station observation feed, but a power user would watch the live airport observation against the expected thermal peak window and adjust automated orders if the day trends hotter than the consensus model spread.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Shanghai on August 6? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi Fees trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.