Highest temperature in Seoul on June 27?

Platform comparison

Active sub-markets

Market context

On 27 June 2026, traders are assessing the likelihood of the highest temperature recorded at Incheon International Airport falling into a specific range, with the crowd currently implying a 0% probability for the “YES” outcome. This real-world event hinges on meteorological data from Wunderground, which will resolve the market based on the peak temperature in degrees Celsius for that day. The settlement window closes at 12:00 UTC on 27 June 2026, meaning the outcome is determined solely by observed weather, not speculation.

Historically, Seoul’s June highs average between 77°F and 81°F (25°C–27°C), rarely exceeding 87°F (31°C), though South Korea has seen record-breaking heat, including a national peak of 41.0°C in Hongcheon in recent years [1][2]. Just days prior, on 19 June 2026, Incheon recorded 91°F (32.8°C), suggesting the current 0% implied probability may be overly cautious given recent thermal trends [3]. Platforms like Polymarket often use decimal odds, while Kalshi and Betfair rely on implied probabilities, creating divergent pricing for identical weather events; fee structures and KYC requirements also vary significantly across these books.

Traders should monitor the Korea Meteorological Administration’s daily forecasts and any sudden shifts in monsoon patterns or urban heat alerts, as these can drastically alter temperature outcomes. Recent reports note South Korea endured its second-hottest July since 1973, with average temperatures reaching 27.1°C, indicating a warming trend that may persist into June 2026 [4]. Smarkets and Betfair may offer more liquidity for such niche weather contracts, while Polymarket’s fee model could affect net returns. No moralising is needed—only factual observation of how these platforms diverge in pricing, access, and settlement mechanics for this specific meteorological event.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Seoul on June 27? 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 quote comes directly from the Polygon order book; the other three are listed with their platform attributes — fees, KYC, settlement currency, payment options — because a 1:1 contract comparison without API access would be guesswork.

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). Polymarket Alternative routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Alternative, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

What does it cost to trade on Polymarket Alternative?

Zero. Polymarket Alternative routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Alternative triggers a quick verification flow that finishes in minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.