Highest temperature in Busan on August 1?

Platform comparison

Market context

Busan’s late-summer heat is usually enough to make the upper temperature bands the default expectation, but this contract is tied to the single highest reading at Gimhae Intl Airport Station on 1 August, not the daily average. Seasonal benchmarks point to August as Busan’s hottest month, with typical daytime highs around 28–31°C and some sources allowing for short spikes well above that range; AccuWeather’s August 2026 outlook puts daily highs in Busan at 82–88°F, roughly 28–31°C.[1][2][4][7][13] Against that backdrop, a 0% implied YES probability looks like a market pricing a very specific threshold as effectively unreachable, rather than a view that Busan will be cool.

Comparable cases suggest the real question is whether conditions can produce a one-off extreme rather than a normal summer day. Long-run climate data show August warm enough for occasional surges, with Busan’s monthly record high reaching 37.3°C in historical climate tables, and one weather-history source citing a warmest-day figure of 38°C in August 2017.[15][16] By contrast, forecast averages sit far lower, and the spread between ordinary August heat and a true station record is wide enough that prediction-market pricing can diverge sharply from broad analyst-style weather consensus when traders focus on station-level maxima rather than citywide averages.[1][4][16]

Traders should watch the near-term synoptic setup: humidity, cloud cover, rainfall timing, and any heat-advisory pattern over southern Korea will matter more than the month-average forecast. Busan’s August climate is typically humid and wet, with timeanddate and other guides flagging high precipitation and muggy conditions that can cap daytime extremes even in a hot month.[4][12][13] The market cannot settle until Wunderground posts the final daily maximum for Gimhae Intl Airport Station, so intraday swings are likely to hinge on whether the afternoon peak arrives before marine influence or showers limit heating.[4]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.