Highest temperature in Seoul on June 26?

Platform comparison

Active sub-markets

Market context

Seoul’s June climate is transitioning from mild early-summer warmth into the hotter, more humid conditions that precede the monsoon season. Historical averages place daytime highs between 19°C and 28°C, with late June often pushing toward the upper end of that range as humidity builds and afternoon showers become more frequent[1][2]. The current crowd-implied probability of 0% for a “YES” outcome suggests traders believe the temperature will not exceed the market’s upper threshold, yet this aligns with typical patterns where extreme heat remains uncommon before mid-July. Comparable years show that while late June can feel noticeably hotter, temperatures rarely breach the 30°C mark in Seoul, making a high-temperature outlier unlikely without a specific heatwave catalyst[3][7].

Traders should monitor the Korea Meteorological Administration’s short-range forecasts and any sudden shifts in regional wind patterns, as these directly influence heat accumulation in the Incheon area[4]. A recent KBS weather report for 26 June 2026 notes scattered afternoon showers and a daytime high of 29°C, indicating that while warmth is returning, precipitation may cap peak temperatures[8]. Platform differences matter here: Polymarket users trade via decimal odds with lower fees and no KYC, whereas Kalshi and Betfair require identity verification and offer implied probability pricing with higher structural costs. Smarkets’ fee structure sits between these extremes, and its decimal odds format may better reflect the nuanced 0% probability traders currently assign to extreme heat in this window.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Seoul on June 26? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to PolyGram, 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

Where can I trade this market with the lowest fees?

On PolyGram, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

PolyGram is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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.

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?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in minutes.