Highest temperature in Seoul (Incheon) on August 13?

Platform comparison

Market context

Seoul's maximum temperature on 13 August 2026 will be measured at Incheon International Airport Station and resolved via Weather Underground's Daily Observations table rather than its summary figures—a distinction that matters when platforms diverge on data hierarchy. The current 0% implied probability suggests traders are either absent from this market or treating mid-August Seoul heat as too predictable to warrant pricing uncertainty, though August temperatures in the region typically range between 28–32°C with occasional peaks above 33°C.

Historical August data from Incheon shows the airport station has recorded highs exceeding 34°C in roughly four of the past fifteen years, with 2018 and 2022 both reaching 35°C or above during mid-month heat waves. The 0% probability reflects either thin liquidity or consensus that the market's resolution criteria—specifically the Daily Observations table hierarchy—creates sufficient friction to deter participation. Kalshi's binary structure and Weather Underground's documented measurement consistency make this resolvable, whereas Betfair's lay-betting mechanics might attract different trader profiles sceptical of extreme heat outcomes.

Traders should monitor late July and early August weather patterns across East Asia; the East Asian summer monsoon's intensity and timing directly influence Seoul's August temperatures. South Korea's Meteorological Administration typically issues seasonal outlooks in late June, and any El Niño or La Niña signals from June 2026 onwards could shift expectations. The settlement window closes at midday UTC on 13 August, requiring traders to factor in the time-zone lag between Incheon local time and market closure.

Methodology

We read Highest temperature in Seoul (Incheon) on August 13? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

UK Frequently Asked Questions

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Kalshi Alternative UK has a different geo footprint and routes to Polymarket's order book at 0% fees.

Polymarket vs Betfair Exchange: which is better for UK prediction trading?

Betfair Exchange offers UKGC regulation, GBP settlement, and potentially tax-free winnings — but focuses on sports and politics only. Polymarket has deeper liquidity, 0% platform fee, global event coverage, and crypto/geopolitical markets Betfair doesn't offer. For UK traders: Betfair for regulated GBP sports markets; Polymarket for broader, global prediction events.

Is Kalshi available in the UK?

Kalshi is a US CFTC-regulated prediction exchange. UK residents can create accounts but must use USD and US payment methods. Kalshi's product range overlaps with Polymarket but with lower liquidity on most contracts. For UK traders, Polymarket typically offers better prices due to higher global volume.