Highest temperature in Seoul on July 23?

Platform comparison

Market context

The Seoul airport temperature reading for 23 July is priced with **27°C** as the clear favourite at **49%**, while the crowd is notably lighter on the warmer tail, with **28°C** next at **30%**.[1] For a handicapper, that leaves the market leaning towards a middling summer high rather than an outright heat spike; the **underdog** case is a cooler result if cloud and rain suppress daytime heating, but the consensus is still firmly anchored in the **mid-to-upper 20s**.[1]

That shape is consistent with July in Seoul, when rainfall risk is substantial and the atmosphere is often shaped by the East Asian summer monsoon rather than persistent clear-sky heat.[1][2] July averages in Seoul also show a meaningful chance of precipitation on any given day, which helps explain why the market is not treating the low 30s as the base case.[2] The current **value** angle is whether the market is underestimating a brief warm-up if cloud breaks and showers are limited, but the biggest **contrarian** position remains a cooler-than-forecast outcome if rainfall arrives during the daytime build-up.[1][2]

For traders, the main things to watch are the late-July weather setup over the Korean peninsula and the short-range forecast into the settlement window, especially any shift in monsoon moisture, rain bands, or cloud cover that would cap the afternoon maximum.[1][2] Because the market settles on the highest temperature recorded at Incheon Intl Airport Station on 23 July, the decisive inputs are the day’s actual hourly observations rather than broader city forecasts, so even a modest change in timing of showers can move the result between adjacent bands.[1]

Sources: 1 · 2

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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Who Will Win 2026. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.