Highest temperature in Busan on August 10?

Platform comparison

Market context

Busan’s highest temperature will be set by the reading at Gimhae Intl Airport Station, and the market’s payoff depends on the *Daily Observations* table on Weather Underground rather than the day-summary figure. That matters because platform pricing is already clustering around the low-30s Celsius, with Polymarket showing 30°C and 31°C as the leading bands, while the event’s resolution is tied to a single station rather than a broader city forecast.[4]

Seasonally, August is Busan’s hottest month, with average highs typically in the mid-to-high 20s Celsius and occasional spikes into the low 30s, while some climate references show warm-season maxima reaching the mid-30s on extreme days.[7][12][18] That historical profile explains why a 0% YES price can still be a thin reading rather than a forecast of impossibility: on prediction markets, a zero-percentage quote usually reflects either no active liquidity or a contract framework where the displayed band is far from the crowd’s current preferred range. On Polymarket, prices are shown as implied probabilities in cents per share, whereas Kalshi-style books quote decimal-style contract prices and Betfair or Smarkets instead layer exchange commissions on winnings, which can make the same meteorological view look different after fees; KYC access also varies by platform and jurisdiction.

Traders should watch the local forecast for thunderstorm timing, cloud cover and wind shifts, because a morning rain band can cap the maximum even if afternoon clearing follows. AccuWeather’s forecast for 10 August points to morning thunderstorms, then cloud and brightening later, with a high around 86°F/30°C, while Weather Underground’s station data will ultimately decide whether the realised peak lands in the 29°C, 30°C, 31°C or higher bracket.[16][11] Recent reporting from Korea also shows the peninsula has been in a severe heatwave, with record temperatures elsewhere and Busan described as part of the high-30s belt, so small changes in convection and sea-breeze penetration are the main near-term catalysts rather than any scheduled announcement.[13][15]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Busan on August 10? 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

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.