Highest temperature in Seoul (Incheon) on August 7?

Platform comparison

Market context

Seoul’s highest temperature for this event is being set at Incheon Intl Airport Station by Weather Underground’s Daily Observations table, and the current market price of 0% YES implies traders see virtually no chance the day’s recorded high lands in the resolving temperature band. That is markedly lower than the live weather picture: Korean media reported Seoul at 39°C on 7 August, with heatwave warnings expanded across the capital region and only a slight easing expected from the weekend onwards.[2][5]

For comparison, August in Seoul is normally hot but not usually at the extreme end of the scale. Climatology sources put average August highs around 26–29°C, with daily highs commonly in the low to mid-30s Fahrenheit-equivalent range on forecast sites, while long-run weather data suggest highs around 81–85°F are typical for the month.[1][13][18] On a platform-comparison basis, Polymarket displays the market as a binary implied probability, whereas Kalshi and Betfair-style books usually translate the same view into contract prices or decimal odds, so the same weather expectation can look very different once fees, spreads, and commission are included. KYC also differs materially: access is often broader on exchange-style venues than on stricter US-regulated contracts, which matters for cross-platform arbitrage or hedging.

The main catalyst is the actual observed maximum at the airport station before the settlement window closes, not the headline “day high” figure, so traders need to watch the hourly observation feed rather than summary pages. The immediate weather setup still points to oppressive heat over greater Seoul, but official forecasts say the peak should begin to ease after 7 August, with slightly lower highs and some rain risk later in the weekend.[2][5] That means the key dependency is whether Incheon’s recorded maximum gets close to the severe-heat forecasts or falls back towards more normal August levels before the window ends.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Seoul (Incheon) on August 7? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

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.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.