Highest temperature in Shanghai on August 1?

Platform comparison

Market context

Shanghai’s midday heat in early August is usually still well into the **low 30s Celsius**, with historical August highs in the city commonly around 32–33°C and occasional spikes far above that in heatwave years.[1][2][5] A market set on the day’s maximum temperature at Pudong airport therefore tends to settle on a fairly narrow summer distribution unless Shanghai is hit by a strong hot ridge or the outer bands of a tropical system push moisture and cloud into the area.[8][9][15]

The current **0% YES** implies the crowd sees almost no chance of the chosen temperature range being reached. That is a very strong no-side signal for a weather contract, but it still needs to be read against Shanghai’s normal August profile: the city has reached 39.5°C in recent years and 41°C in historical records, so extreme outcomes are rare but not implausible in the peak of summer.[5][6] For a on-chain market settled in **USDC**, the main practical issue is not direction but the exact Wunderground station reading; even a one-degree shift at the station can move the result into a neighbouring band.

Traders should watch the local forecast path into the 12:00 UTC settlement window, especially any late-morning changes in cloud cover, rainfall, or typhoon-related wind shifts, because those can cap the maximum at Pudong even when inland Shanghai runs hotter.[8][17] In crypto terms, the payoff is independent of BTC or ETH spot, but thin weekend liquidity, basis moves, or broad risk-on/risk-off flows can still affect how quickly the market reprices if weather guidance updates before settlement.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Highest temperature in Shanghai on August 1? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

What are crypto prediction markets?

Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.

Why USDC and not ETH or USDT?

USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.

What does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

Can I use Bitcoin directly?

No, Polymarket operates exclusively in USDC on Polygon. You can bridge BTC to USDC via an exchange or bridge service and deposit on Polygon — typically 10-30 minutes processing time.

Are crypto prediction markets taxable in the US?

In the US, prediction market gains are typically treated as ordinary income or short-term capital gains depending on holding period. Consult a tax professional for your specific situation — we cannot provide tax advice.