Highest temperature in Chengdu on August 20?

Platform comparison

Market context

On 20 August 2026, the highest temperature recorded at Chengdu Shuangliu International Airport will determine this market's outcome. Resolution depends on the Daily Observations table from Weather Underground rather than the Day High & Low summary, a distinction that matters when station instruments record micro-fluctuations or when reporting lags create discrepancies. The settlement window closes at 12:00 UTC on the resolution date, leaving a narrow window for final data confirmation before USDC settlement on-chain.

Chengdu's August climate is consistently hot and humid; historical August highs at Shuangliu typically range from 28–35°C, with extreme readings above 36°C occurring in roughly 5–10% of years during the past two decades. The 0% crowd probability suggests traders are either pricing in an unusually cool August or treating this as a low-conviction market with sparse liquidity. Comparable weather markets on crypto platforms show that temperature ranges within historical norms attract modest participation, whilst extreme-weather scenarios (heatwaves, anomalies) draw speculative volume.

Traders should monitor China Meteorological Administration forecasts released in early August 2026, which typically provide 10–14 day outlooks with reasonable accuracy for maximum temperatures. El Niño or La Niña conditions active during mid-2026 could shift regional patterns; current climate indices suggest monitoring NOAA's Oceanic Niño Index updates. Funding rates and spot activity on major exchanges rarely correlate with weather markets directly, but sustained dry conditions across southern China or unexpected heat domes would be material catalysts that might shift implied probabilities closer to settlement.

Methodology

This page reads Highest temperature in Chengdu on August 20? 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%.