Highest temperature in Seoul on July 4?

Platform comparison

Market context

The real-world event driving this market is the daily maximum temperature recorded at Incheon International Airport on 4 July 2026, which will determine whether Seoul hits the 29°C bracket. Current crowd-implied probability sits at 0% for a YES outcome, yet historical data and parallel markets suggest this figure is misleadingly low. In July, Seoul typically experiences highs between 24°C and 28°C, with the average reaching 27.7°C, while the 2026 forecast predicts a range of 81°F to 94°F (27°C to 34°C)[3][8]. Parallel prediction markets on Lines.com assign a 30.5% probability to 29°C specifically, and Polymarket currently favours 28°C at 65%, indicating that temperatures near 29°C are plausible minority outcomes rather than impossibilities[1][2].

Traders should monitor the progression of the summer monsoon season (Jangma), which peaks in July and often brings heavy, short rainfalls that suppress daytime temperatures[4]. The primary catalyst is the daily weather schedule from the Korea Meteorological Administration, which currently forecasts slight rainfall with a 60% probability of precipitation for the coming hours[5]. Any sudden shift toward clearer skies before noon could allow temperatures to spike, whereas sustained rain will likely keep highs below the 29°C threshold. Recent news from Anadolu Ajansı highlights that South Korea has already recorded unprecedented July temperatures exceeding 40°C in western cities, suggesting extreme heat variability is possible even during the monsoon[9]. The market leans on the monsoon dependency as the decisive factor for the final reading.

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

For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.

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 Election Predictions UK route into the same order book at 0% fees.

Are political prediction markets legal in my country?

It varies. They sit in legal gray areas in most jurisdictions. Polymarket is geo-blocked from US/UK/EU; some broker frontends have a different geo footprint. Trade only with capital you can afford to lose, and only if you understand the legal status in your jurisdiction.

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.