Highest temperature in Shanghai on August 3?

Platform comparison

Market context

Shanghai’s peak temperature on 3 August is trading as a **heavy favourite to land in a hot-but-not-extreme band**, with the market currently implying **0% YES**, which is the kind of price that usually reflects thin liquidity rather than a true forecast. The consensus from the forecast set is for a very warm day in the mid-30s Celsius: one source puts Shanghai at **29–37°C** and another has **34.5°C / 24.4°C** for the day, while broader August climatology points to daily highs around **31–33°C** and frequent humidity-driven heat rather than record-setting spikes.[5][4][12][18]

The historical frame is straightforward: Shanghai in August is typically hot, sticky and rain-prone, but the distribution still centres on the low-to-mid 30s rather than the upper 30s every day. AccuWeather’s August range for Shanghai is **82° to 92°F** (about **28–33°C**) with an average high near **87°F**; Weather2Travel similarly describes August as **very high heat and humidity** with daytime maxima around **31°C**, which makes a top-end result above the low 30s possible but not the base case.[1][12] That leaves value, if any, in the common “neither extreme nor cool” outcome: a modestly warm session is the favourite, while a surprise surge into the upper 30s is the contrarian tail.[5][1]

For catalysts, the key variable is not a scheduled announcement but the day’s weather evolution at **Shanghai Pudong International Airport Station** before the settlement window closes at **12:00 UTC**. The latest public forecasts already flag thunder or showers on 3 August, which matters because cloud and rain can cap the high even in a muggy airmass.[2][9] A trader watching this market should focus on whether convection arrives early enough to suppress the midday peak, or whether brief clearing before the rain allows a short-lived temperature push; the value spot is usually on the market underpricing an ordinary warm reading, while the underdog case is a cleaner, hotter break than the forecast consensus currently suggests.[2][5]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Shanghai on August 3? 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

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

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.

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.

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?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.