Highest temperature in Seoul on July 9?

Platform comparison

Market context

On 9 July 2026, Seoul faces a critical heat test as the city approaches its most extreme early-July temperatures ever recorded, with recent data showing a record-breaking 37.8°C hit just days prior on 8 July[7]. This market, currently pricing a 26°C outcome at 34.5% probability while the crowd implies 0% for a YES resolution on higher ranges, presents a stark contrast between consensus and historical reality[1]. July in Seoul typically sees highs climbing from 81°F to 85°F, rarely dipping below 74°F or exceeding 91°F, suggesting that a 26°C cap is statistically underwhelming given the season’s thermal trajectory[2].

The catalyst for traders lies in the lingering tropical night phenomenon, which has extended into the longest stretch in 117 years, indicating that heat is not merely a daytime issue but persists well into the night[6]. Recent records confirm South Korea endured its second-hottest July since 1973, with an average of 27.1°C, while Seoul itself reached 37.7°C, the highest early-July temperature in 117 years[4][9]. With the all-time national heat record now standing at 41.0°C in Hongcheon, the value spot for contrarian traders sits firmly on the higher temperature ranges, as the consensus appears to be ignoring the overwhelming evidence of an intensifying heatwave[3]. The settlement window closing on 9 July 2026 at 12:00 UTC demands immediate attention to Wunderground’s hourly data for Incheon, where the highest recorded temperature will determine the outcome.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Seoul on July 9? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

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.

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 Who Will Win 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.