Highest temperature in Busan on July 28?

Platform comparison

Market context

On 28 July 2026, the highest temperature recorded at Gimhae International Airport in Busan will fall into one of several defined ranges, measured in degrees Celsius. This South Korean coastal city experiences monsoon influence during late July, with humidity and afternoon convection typically driving peak temperatures between 28–32°C during this period. The settlement mechanism relies on historical data from Weather Underground, which archives hourly readings from the airport station—the official reference point for Busan's recorded weather.

Busan's July climate shows consistent patterns across recent decades. The city averaged a high of 29.2°C in July 2023 and 30.1°C in July 2022, with extreme readings occasionally reaching 33–34°C during heat waves. The 0% crowd probability currently implied across prediction platforms suggests traders are either awaiting range specifications or treating this as a placeholder market. Polymarket, Kalshi, and Betfair typically diverge on fee structures and odds formats—Polymarket charges 2% on both sides, whilst Kalshi's binary structure and lower fees appeal to US-based traders with full KYC. Smarkets' decimal odds presentation attracts European traders familiar with that format, though all three require verification for this market type.

Traders should monitor the Korean Meteorological Administration's seasonal forecasts and any El Niño or La Niña updates affecting East Asian summer patterns. Late-July typhoon activity or upper-level ridge positioning could push temperatures above historical norms. The settlement window closes at 12:00 UTC on 28 July, allowing only morning readings to influence outcomes if the market resolves before afternoon peak heating occurs—a structural detail worth confirming across platforms before committing capital.

Methodology

We read Highest temperature in Busan on July 28? 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.

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.

Which platform is accessible globally?

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

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Polymarket Alternative offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.