Highest temperature in Beijing on August 15?

Platform comparison

Market context

Beijing's highest temperature on 15 August 2026 will be recorded at the Capital International Airport Station and measured in degrees Celsius. The market currently prices a 3% probability on the YES outcome, suggesting the crowd expects a relatively moderate or cool day for mid-August in the Chinese capital.

Historical August temperatures at Beijing Capital Airport show a consistent pattern: daily highs typically range between 28–32°C during mid-month, with extremes occasionally reaching 35°C or above during heat waves. The 30-year climatological average for 15 August sits near 29°C. Traders assessing the current 3% probability should note that this implies the market is pricing in a notably cooler-than-normal day or a specific temperature threshold well below seasonal norms. Comparable years with unusual cooling—such as sustained cloud cover or monsoon influence—remain rare but documented; the resolution hinges on Weather Underground's Daily Observations table rather than summary figures, which can occasionally diverge by 1–2°C depending on measurement timing and station calibration.

Catalysts to monitor include seasonal weather pattern forecasts from the China Meteorological Administration, which typically issue 10–14 day outlooks by early August. El Niño or La Niña phase transitions can shift East Asian summer temperatures; current oceanic indices should be tracked through NOAA's Climate Prediction Center. Settlement occurs at 12:00 UTC on 15 August 2026, giving traders a fixed window to observe actual conditions. Any significant atmospheric disturbance—tropical cyclone remnants, upper-level troughs, or blocking highs—would materially affect the outcome and could shift market pricing substantially in the weeks preceding the event.

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.

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

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.

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%.