Highest temperature in Seoul on July 13?

Platform comparison

Market context

Seoul faces its peak summer heat on 13 July 2026, with the Incheon International Airport station set to record the day’s highest temperature in degrees Celsius. Historical data shows July highs in Seoul typically range from 29°C to 35°C, rarely exceeding 36°C, though recent years have seen record-breaking spikes, including 37.8°C in early July 2023—the hottest in 117 years [2][6]. The current crowd-implied probability of 0% for any specific outcome suggests extreme uncertainty or a market still forming, contrasting sharply with Polymarket’s active pricing, where 32°C leads at 42% and 33°C follows at 32% [1].

Traders should monitor real-time updates from Wunderground, the official resolution source, and watch for any sudden shifts in regional weather patterns, such as tropical night streaks that have previously pushed overnight temperatures above 25°C for over 20 consecutive days [3]. While Kalshi and Betfair typically use decimal odds and enforce stricter KYC, Polymarket operates on implied probability with minimal identity verification, creating divergent liquidity and fee structures on this event [1]. Smarkets, meanwhile, offers lower fees but less depth on niche weather markets. With settlement closing at 12:00 UTC on 13 July, the market’s resolution hinges entirely on the single highest reading recorded at RKSI, making intraday volatility a critical catalyst.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Seoul on July 13? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

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.

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.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.

Which platform supports Klarna/SOFORT?

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