Highest temperature in Seoul on July 25?

Platform comparison

Market context

Seoul's summer temperatures in late July typically peak between 28 and 32 degrees Celsius, with occasional excursions above 33°C during heat waves. The settlement mechanism relies on Incheon International Airport's official weather station, which serves as the standard reference for Korean meteorological data and sits roughly 50 kilometres west of central Seoul. The 0% crowd probability suggests traders are either absent from this market or treating it as a placeholder pending clearer forecasting data closer to the event date.

Historical July records for the Seoul metropolitan area show that temperatures exceeding 35°C occur roughly once every three to five years during the summer monsoon season. The 2018 heat wave pushed Seoul to 39.6°C, whilst more typical late-July highs cluster around 30–32°C. On Polymarket and Kalshi, comparable weather markets often show minimal trading volume until 7–10 days before settlement, when meteorological models stabilise; Betfair's decimal odds format and lower KYC barriers can attract earlier speculation on weather outcomes, though liquidity remains thin. Smarkets' fractional odds structure similarly draws niche weather traders earlier than centralised US platforms.

Traders should monitor the Korean Meteorological Administration's extended forecasts from mid-July onwards, particularly tracking the position of the Pacific high-pressure system and any tropical cyclone activity in the Western Pacific. El Niño or La Niña conditions influence monsoon intensity; the current phase will shape whether July 2026 trends toward above-average or near-normal temperatures. Incheon's coastal location means sea-surface temperatures and typhoon proximity become critical variables in the final week before settlement.

Methodology

This page compares Highest temperature in Seoul on July 25? 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 Kalshi Alternative UK, 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.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

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.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi Alternative UK 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.