Highest temperature in Seoul on July 23?

Platform comparison

Market context

The real-world event here is the hottest temperature recorded at Incheon International Airport Station on 23 July, measured in degrees Celsius and checked against Wunderground’s daily history page. In these markets, a **YES** share pays out if the final settlement condition is met, while a **NO** share pays out if it is not, so the key question is whether the day’s peak temperature falls into the specified range before the settlement window closes.

For context, late July in the Seoul area is typically warm and humid, with average daytime highs around **27–28°C** and a meaningful chance of rain, so the market is generally reading against a summer distribution that already sits close to the low-30s threshold. One live market snapshot already shows **30°C or higher** as the front-runner, with **29°C** the next closest outcome, which suggests traders are treating a near-30°C reading as a realistic base case rather than an outlier. July weather in Seoul often features short, heavy showers rather than all-day rain, so brief cloud cover can temper the high without necessarily ruling out a warm afternoon.

What matters most on the day is the actual airport observation path rather than a city-wide headline temperature, because airports can run slightly cooler or warmer than central districts depending on wind, cloud, and timing. Traders usually watch the midday-to-afternoon forecast trend, any rain-band timing, and whether the day clears enough for the temperature to build before the market’s cut-off. Since the market resolves from Wunderground’s recorded daily maximum, the final outcome depends on the highest logged value, not the temperature at a specific hour.

Sources: 1 · 2 · 3

Methodology

This page reviews Highest temperature in Seoul on July 23? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Prediction Market UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Prediction Market UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Prediction Market UK 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.