Highest temperature in Seoul on June 29?

Platform comparison

Market context

Seoul is entering early summer with a noticeable shift in humidity over the last 24 hours, pushing the city toward the start of its monsoon season. The current crowd-implied probability of 17% YES for the highest temperature on 29 June reflects a market that is cautious about an extreme heat spike, given that late June typically brings short, predictable afternoon showers rather than sustained scorching days. Historical data shows the warmest day in June 2026 so far was 19 June, which hit 34.0°C, while the lowest minimum was 15.6°C on 6 June, indicating a range that rarely breaches the 37°C threshold seen in July [6][7].

Traders should monitor the Korea Meteorological Administration’s short-range forecasts for sudden shower warnings, as a 60% precipitation probability with slight rainfall intensity was already noted for the 15-hour window [5]. The key catalyst is the timing of the monsoon onset, which usually begins in late June and can suppress peak temperatures by introducing cloud cover and rain [2][3]. With humidity rising but not yet reaching the exhausting levels of midsummer, the market is likely to remain anchored below the 37.1°C record set in July 2008, making the 17% YES probability a reasonable reflection of the current weather trajectory [7].

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

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 Today. 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.

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's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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.