Highest temperature in Seoul on July 4?

Platform comparison

Market context

The market asks whether Seoul’s highest temperature on 4 July 2026 will reach 29°C, with the current crowd-implied probability for that outcome sitting at 0% YES, despite historical data showing July highs in Seoul typically range between 27°C and 30°C. AccuWeather forecasts daily highs for July 2026 between 81°F and 94°F (27°C to 34°C), with an average high of 85°F (29.4°C)[3]. In 2025, South Korea recorded 22 tropical nights in July—the most since 1908—when Seoul temperatures stayed above 29°C for 22 consecutive days, suggesting that sustained heat above this threshold is increasingly plausible in recent years[7].

Traders should monitor real-time updates from Wunderground for the Incheon Intl Airport Station, as the market resolves based on its official daily maximum temperature reading[1]. The key catalyst is the monsoon season (Jangma), which peaks in July and often brings heavy rain that can suppress daytime highs; however, when rain clears and sunshine returns, temperatures can surge rapidly, especially in central inland cities like Seoul[5]. No scheduled political debates or campaign-finance disclosures are directly tied to this weather event, but the market leans on the meteorological dependency of monsoon intensity versus post-rain heat spikes, with AccuWeather and the Korea Meteorological Administration providing the most authoritative short-range forecasts[3][8].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Political prediction markets differ structurally from sports betting: thinner liquidity, longer settlement windows, higher sensitivity to single news events. This page shows the live Polymarket quote for Highest temperature in Seoul on July 4? plus platform attributes for the three reference venues, so you can see at a glance where the deepest market for this question sits.

Resolution & payout

Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.

Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.

FAQ

What resolution source is used for elections?

Polymarket defines the source per contract — usually Associated Press (AP Race Call), Reuters or the official electoral commission. The source is stated in contract details before the market opens.

Can prediction markets influence election outcomes?

Markets reflect expectations rather than create them. Studies show public-facing markets can anchor expectations, but don't influence the underlying outcome. Political markets are information, not advocacy.

Which platform has the deepest political liquidity?

Polymarket — by far. US 2024 presidential volume was ~$3.5B vs Kalshi (~$200M) and Betfair (~$120M). Where Polymarket is geo-blocked, brokers like Trump Prediction route into the same order book at 0% fees.

How fast do political markets react to news?

High-liquidity markets move within seconds to minutes. A Trump tweet on the economy can shift the "Trump 2024" market 2-5 points before mainstream media has written anything.

Which political events have the biggest volume?

US Presidential election, party nominations (DNC/RNC), Senate majorities, individual state outcomes (Pennsylvania, Michigan, Wisconsin), and major European elections. Peak markets reach $50-500M per event.