Highest temperature in Busan on August 1?

Platform comparison

Market context

Busan’s highest temperature on 1 August is a straightforward weather settlement tied to the Gimhae Intl Airport station, so the key question is whether the day ends up near the low-to-mid 30s Celsius that is typical for early August or far hotter. Seasonal context points to a warm, humid coastal summer: August normals for Busan cluster around an average high near 30–31°C, with typical daily highs in the mid-to-high 20s Celsius and the hottest month of the year usually falling in August.[4][5][13][19]

The market’s 0% YES pricing looks unusual against that background, but it can be read as a reminder to compare venue mechanics before treating odds as interchangeable. On Polymarket, quoted prices are direct implied probabilities, while Kalshi and similar exchange-style books generally display prices closer to cents on the dollar and traders also need to factor in fees; Betfair and Smarkets, by contrast, are betting exchanges where commission, liquidity, and local KYC access can materially change the effective price a trader sees. For a single-station temperature market, historical comparables matter because Busan has occasionally reached the high 30s Celsius in extreme heat, including a widely reported 38.8°C in southeastern South Korea in 2025, so a zero price implies the market is treating an extreme outcome as effectively impossible rather than merely unlikely.[11][18]

The main catalysts are the forecast path into the afternoon, any heat advisories over southern Korea, and whether humid onshore flow keeps cloud and rain from capping the day’s maximum. Busan’s August forecasts show a wide but still hot envelope, with daily highs around 82–88°F and frequent humidity, so traders should watch late-morning updates, radar, and any official weather warnings rather than assuming the early reading will hold.[1][10][16] On this contract, the final print is what matters: the maximum temperature at Gimhae Intl Airport before the settlement window closes, with later revisions handled under the market’s publication rules.[7]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Busan on August 1? 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.

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.

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.

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.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi 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.