Highest temperature in Seoul on July 10?

Platform comparison

Market context

The underlying event is the peak daytime temperature recorded at Incheon International Airport on 10 July 2026, which will determine the settlement of this prediction market in USDC. Current crowd-implied probability sits at 0% for the "YES" outcome, suggesting traders believe the temperature will fall outside the specified range, despite Seoul’s recent history of extreme heat.

Historical data frames this low probability as potentially premature. July 2025 was South Korea’s second-hottest July since 1973, with a nationwide average of 27.1°C, while early July 2024 saw Seoul hit 37.7°C, the highest in 117 years[4][7]. Incheon typically mirrors Seoul’s highs, with July averages ranging from 81°F to 85°F (27–29°C), rarely exceeding 91°F (33°C)[5]. A streak of tropical nights above 25°C recently broke a century-old record, indicating sustained thermal pressure that could push daytime peaks higher[1][3].

Traders should monitor the Korea Meteorological Administration’s weekly heat forecasts and any announcements regarding monsoon timing, as delayed rainfall often exacerbates heatwaves[4]. Recent Anadolu Ajansı reports confirm South Korea is experiencing record-breaking summer temperatures, with Gimmo and Seoul hitting 34.3°C and 35.8°C respectively in August 2025[7][8]. On-chain, watch for whale flows into BTC/ETH futures funding rates, as macro volatility often correlates with speculative positioning in weather-linked prediction markets, per data from Coinglass.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Highest temperature in Seoul on July 10? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

What are crypto prediction markets?

Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.

Why USDC and not ETH or USDT?

USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.

How does UMA secure the resolution?

The UMA Optimistic Oracle uses a bond system: a proposer posts a bond, a two-hour challenge window opens. On dispute the losing side forfeits the bond — financial incentive for honest resolution.

How volatile are crypto prediction markets?

Crypto markets react to spot prices — a 5% BTC move typically shifts a "BTC above X by date" market 10-20%. Polymarket crypto market liquidity is usually six-figure USD, sufficient for active trading.

Which crypto markets exist on Polymarket?

Currently active markets include BTC/ETH/SOL price targets, halving dates, ETF approvals, hard-fork outcomes and Layer-2 TVL thresholds. The list updates weekly; biggest volume sits on BTC and ETH price forecasts.