Highest temperature in Seoul (Incheon) on August 14?

Platform comparison

Market context

On 14 August 2026, Seoul's Incheon International Airport Station will record a daily maximum temperature. This market resolves to the temperature range containing that highest reading, as logged in Weather Underground's Daily Observations table rather than the Day High & Low summary—a distinction that matters when comparing resolution methodologies across platforms. Polymarket and Kalshi both settle weather derivatives on granular data sources, though Kalshi's binary structure (YES/NO on specific thresholds) differs from Polymarket's categorical bins; Betfair and Smarkets typically offer decimal odds formats that require manual conversion to implied probability, whereas Polymarket displays probabilities directly. The current 0% implied probability suggests either extreme confidence in a particular temperature range or insufficient liquidity across all bins.

Seoul's August climate presents a consistent baseline: historical August highs at Incheon average 29–31°C, with extremes rarely exceeding 35°C except during heat waves. The 2022 Korean heat wave pushed Seoul to 39.6°C in early August, establishing that exceptional readings remain possible though uncommon. Traders should monitor late-July 2026 weather patterns and any tropical cyclone activity in the Western Pacific, as typhoon systems can suppress temperatures or create sudden spikes depending on timing and proximity.

The resolution methodology—specifically Weather Underground's Daily Observations table—creates a potential edge for traders familiar with how that platform timestamps readings versus competitors' data sources. KYC requirements vary significantly: Polymarket operates with lighter verification in most jurisdictions, whilst Kalshi enforces stricter US-based identity checks, affecting which trader cohorts can access this market across venues.

Methodology

This page compares Highest temperature in Seoul (Incheon) on August 14? 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

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

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.

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.

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. 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.