Highest temperature in Seoul (Incheon) on August 19?

Platform comparison

Market context

Seoul's summer heat peaks in August, with daily highs typically ranging between 28–32°C at Incheon International Airport, the official observation point for this market. August 19th falls within the latter half of the month when monsoon influence can either suppress temperatures through cloud cover and precipitation or intensify heat through humidity and stagnant air masses. The resolution hinges on Weather Underground's Daily Observations table rather than summary figures, a distinction that matters when intraday spikes occur; traders should verify the exact methodology Wunderground applies to its Incheon station data, as discrepancies between real-time readings and daily summaries have historically shifted outcomes in Asian weather markets.

Historical August records for Incheon show extremes ranging from 34.5°C during heat waves to 26°C in cooler, wetter years. The current 0% crowd probability suggests the market may be pricing in either a conservative baseline or insufficient liquidity to establish meaningful odds. Traders should cross-reference Korea Meteorological Administration forecasts and seasonal patterns; the 2023 and 2024 August cycles saw above-average heat, though individual daily peaks varied significantly based on typhoon proximity and upper-level atmospheric patterns.

Catalysts include tropical cyclone tracking in the Western Pacific—any system approaching the Korean peninsula in mid-August would suppress temperatures—and real-time atmospheric pressure anomalies. Monitor KMA's 10-day outlook updates and sea surface temperature anomalies in the Yellow Sea, both of which drive convective activity and thermal regimes. Settlement occurs at 12:00 UTC on August 19th, allowing traders to react to morning forecasts before the observation window closes.

Methodology

This page reads Highest temperature in Seoul (Incheon) on August 19? 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

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.

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.

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%.