Highest temperature in Seoul on July 5?

Platform comparison

Market context

Seoul is bracing for a subtropical summer that the Korea Meteorological Administration has flagged as hotter and wetter than the annual average, with July specifically projected to exceed 24.6°C as a mean temperature[4]. This official outlook, released just days ago, shifts the real-world baseline from typical mid-20s warmth to a scenario where intense downpours and sauna-like heat dominate the peninsula, directly challenging the market’s current 0% YES probability for any extreme heat range[4]. The sudden emphasis on a “subtropical” climate akin to Southeast Asia suggests that historical norms may be insufficient for pricing this event, as the KMA models now predict higher temperatures and more rainfall than the 30-year average[4].

Historical data frames July in Seoul as typically hovering between 25°C and 30°C, with occasional spikes nudging 30°C, yet the KMA now warns that late July and August often bring the most sustained heat depending on the year[3]. While the average high for July sits at 25°C, recent records show western cities topping 40°C in July, marking the highest ever for the country and indicating that extreme outliers are not impossible[10]. The current 0% probability appears to ignore these precedents, as the combination of high humidity and rising sea temperatures could push daily highs well beyond the typical 28°C anchor, potentially reaching the 30°C+ ranges seen in recent anomalies[3][10].

Traders must monitor the KMA’s updated three-month outlook for typhoon activity, as the forecast predicts a similar number of typhoons to the annual average, which could temporarily suppress temperatures or trigger flash floods that alter heat accumulation[4]. The immediate catalyst is the daily weather bulletin from the KMA, which will detail the timing of intense downpours and squalls that characterise this sauna-like summer[4]. Any deviation from the predicted 245.9–308.2 mm rainfall range for July could signal a clearer, hotter spell, making the KMA’s short-range forecasts the primary dependency for assessing whether the 0% probability is a mispricing of the emerging subtropical trend[4].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Seoul on July 5? 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 Today, 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 Today. 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'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.

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.