Highest temperature in Shanghai on August 6?

Platform comparison

Market context

Shanghai’s peak temperature on 6 August will be set by the highest reading at Pudong airport, and the market settles in USDC once the Wunderground daily history page for that station is fixed for the day. With the current crowd-implied probability at 0% YES, the contract is pricing an outcome at the low end of the Shanghai summer distribution rather than a materially hot reading.

Recent forecast sources point to a classic late-summer profile: daily highs around 31–35°C, with Shanghai’s August norms sitting near the high 20s to low 30s Celsius and heavy humidity. AccuWeather’s August outlook for Shanghai shows highs mostly in the high 80s to low 90s Fahrenheit, while travel and climatology pages describe August as one of the city’s hottest and wettest months, with daytime maxima commonly around 31–32°C and frequent rainfall. That makes a low settlement band more consistent with a cloudy, rainy, or sea-breeze day than with a clear-sky heat spike.[1][3][9]

The main catalysts are the day’s local weather evolution and whether any late-morning or afternoon sun breaks through before the settlement window closes at 12:00 UTC. Traders will be watching the Pudong airport observation stream, short-range model updates, and any rain-band or typhoon-related shifts that can cap the high earlier than expected; Shanghai’s August weather is also prone to rapid changes from showers and tropical systems.[3][10][15] In crypto terms, this is a clean USDC-settled event with limited direct BTC or ETH linkage, though broader risk sentiment and funding conditions can still affect positioning around low-liquidity weather contracts.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Highest temperature in Shanghai on August 6? 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.

UK Frequently Asked Questions

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.

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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.