Highest temperature in Seoul on July 2?

Platform comparison

Market context

On 2 July 2026, the highest temperature recorded at Incheon International Airport will determine the outcome of a prediction market, with the current crowd-implied probability of a specific high-temperature range sitting at 0% YES. This reflects the intense heat and humidity typical of South Korea’s July monsoon season, where daily averages often exceed 20°C and highs can approach 30°C or more, especially when rain clears and the sun emerges [1][7]. The settlement window closes at noon UTC, relying on Wunderground data for the Incheon station, a key metric for traders comparing platforms like Polymarket, which uses decimal odds, versus Kalshi or Betfair, which often quote implied probabilities and enforce stricter KYC and fee structures.

Historically, July in South Korea has seen record-breaking temperatures, with two western cities recently topping 40°C—the highest ever recorded for the month [9]. Such extremes are not uncommon during the Jangma rainy season, which lasts from late June to mid-July, bringing short but heavy downpours that concentrate moisture and elevate humidity above 80% [1]. Traders should monitor announcements from the Korea Meteorological Administration regarding heatwave forecasts, as current short-range data indicates a feel temperature of 29°C with light southern winds and a 20% precipitation probability [4]. These dependencies, alongside platform-specific fee models and KYC reach, shape how different books price the same weather event, creating divergences in decimal odds versus implied probability that savvy traders must navigate.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Seoul on July 2? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Robinhood Prediction Markets, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Robinhood Prediction Markets offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.