Highest temperature in Busan on August 15?

Platform comparison

Market context

Busan's peak temperature on 15 August 2026 will be measured at Gimhae International Airport Station and resolved against Weather Underground's Daily Observations table rather than its summary display—a distinction that matters when platforms diverge on data hierarchy. The current 0% implied probability reflects either extreme confidence in a specific temperature ceiling or sparse liquidity in early-stage positioning; comparable August readings at Gimhae typically range between 28–34°C, with 2023 recording 32.1°C on the same date.

Historical August patterns in Busan show consistent heat but rarely extreme outliers. The city's coastal location moderates temperatures relative to inland Korean regions, though typhoon season (peaking August–September) can introduce volatility. A 2015 heat wave pushed Busan to 34.6°C in mid-August, but such events remain statistical outliers rather than baseline expectations. Traders should note that resolution hinges entirely on Weather Underground's Daily Observations methodology, which may capture intraday spikes differently than other meteorological services—a technical detail that separates this market's settlement from casual weather betting.

Kalshi's KYC requirements and US-focused regulatory framework may limit participation compared to Betfair or Smarkets, which operate with lighter onboarding in certain jurisdictions. Polymarket's decimal odds format (1.50 versus 33% implied probability) appeals to different trader cohorts, though all platforms ultimately depend on identical source data. Monitoring Korean Meteorological Administration forecasts and typhoon tracking through mid-August will signal whether atmospheric conditions shift the probability distribution materially.

Methodology

This page compares Highest temperature in Busan on August 15? 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 Kalshi Alternative, which mirrors the Polymarket order book at 0% fees.

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.

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.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

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 has a different geo footprint and routes to Polymarket's order book at 0% fees.