Pronóstico: Highest temperature in Seoul on July 3?

Platform comparison

Market context

The highest temperature recorded at Incheon International Airport on 3 July 2026 will likely fall within the mid-to-high 20s Celsius, with occasional peaks nudging 30°C, as July in Seoul is historically hot and humid with average highs close to 30°C[1][2]. The current crowd-implied probability of 0% for a specific high temperature range appears to stem from a misunderstanding of seasonal norms rather than an actual absence of heat; July is the wettest month in Korea, yet when rain clears and the sun emerges, temperatures can feel over 34°C due to humidity exceeding 80%[1][2]. Historical data shows Seoul reached 37.1°C on 8 July 2008, the highest July temperature since 1908, proving that extreme heat is possible even during the monsoon season[7].

Traders should monitor the Korea Meteorological Administration’s short-range forecasts for precipitation windows and wind patterns, as clear skies following heavy rain can trigger rapid temperature spikes[4]. Recent reports indicate that summer heat in Korea is arriving 2–3 weeks earlier than last year, suggesting a potential for record-breaking temperatures this July[6]. Meteorologists have warned that this summer could be South Korea’s hottest yet, with Seoul experiencing temperatures up to 37.1°C in previous years, making it critical to watch for announcements regarding heatwaves or extreme weather alerts from official sources[7]. On Polymarket, this contract is priced using USDC on the Polygon network, where conditional tokens reflect the market’s current 0% confidence despite the historical likelihood of high temperatures in early July.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Pronóstico: Highest temperature in Seoul on July 3? 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 Polymarket Qué Es, 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

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.

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 Polymarket Qué Es 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.