Highest temperature in Beijing on August 17?

Platform comparison

Market context

Beijing's highest temperature on 17 August 2026 will be measured at Capital International Airport Station and resolved via Weather Underground's Daily Observations table, with settlement in USDC on the prediction market. The 0% crowd probability reflects uncertainty around which temperature band will be recorded, rather than dismissal of the event itself occurring.

Historical August temperatures at Beijing Capital Airport show a consistent pattern: daily highs typically range between 26–32°C during mid-August, with occasional peaks above 33°C during heat waves. The past five years' data from the China Meteorological Administration indicates that extreme heat events (above 35°C) occur roughly once every three to four years in this window, whilst readings below 25°C are rare. This distribution suggests the market's current pricing may underweight the probability of moderate-to-warm outcomes (28–32°C range) that dominate the historical record.

Traders should monitor the East Asian monsoon forecast and any heat dome developments tracked by the European Centre for Medium-Range Weather Forecasts (ECMWF) in early August 2026. Beijing's summer weather is heavily influenced by the position of the subtropical high-pressure system; if it shifts northward, temperatures spike sharply. Real-time updates from China's National Meteorological Centre typically become reliable five to seven days before the target date. Settlement hinges on the specific Daily Observations entry at Weather Underground, not the Day High & Low summary, so traders verifying historical station data now will have an edge in calibrating their positions before the final week.

Methodology

This page reads Highest temperature in Beijing on August 17? 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.

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.

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%.