Highest temperature in Seoul (Incheon) on August 1?

Platform comparison

Market context

The relevant event is the **highest reading at Incheon Intl Airport Station on 1 August**, which is usually a late-summer heat question rather than a one-off extremes trade. Seoul and the nearby Incheon area are typically hot and humid in August, with average highs around 30°C in Seoul and daily highs that commonly sit in the low-to-mid 30s Celsius across the month; WeatherSpark puts Seoul’s early-August average highs near 85°F/29°C, with only gradual cooling later in the month[1][2][13]. That backdrop makes a *0% YES* price look like a display issue rather than a literal forecast, because the contract’s settlement source is a temperature reading that should almost certainly be above zero on any normal summer day.

For historical framing, the key comparison is not the city record but the distribution of ordinary August highs. Time and Date and WeatherSpark both place Seoul’s August climate in the 79°F-86°F range on average, while Weather Underground’s own history pages show that Korea’s late-summer heat can be severe enough to push records far above seasonal norms[13][14][16]. In platform terms, Polymarket prices this as an implied probability, while Kalshi and Betfair typically expose the same information differently: Kalshi via contract price and exchange-style settlement, Betfair via decimal odds that embed commission, and Smarkets via decimal odds with lower headline commission but different market access. For a simple temperature range contract, those format differences matter more than the underlying weather view, because the same forecast can look far closer to “free” on one venue than another once fees are included.

The main catalysts are routine rather than dramatic: the day’s actual progression at Incheon, cloud cover, and whether any rain or sea-breeze moderation limits the afternoon peak. AccuWeather’s August 2026 outlook for Seoul points to daily highs in the low-to-high 80s Fahrenheit, which is consistent with a warm but not exceptional start to the month[6]. Traders should also watch whether the market’s exact reference station and reporting convention on Weather Underground match the day’s apparent citywide heat, because airport stations can run cooler or warmer than the broader metropolitan average depending on wind and coastal influence.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Seoul (Incheon) on August 1? 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, 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.

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 is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Kalshi Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.

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.