Highest temperature in Seoul on June 22?

Platform comparison

Active sub-markets

Market context

The relevant event is the day’s highest recorded temperature at Incheon International Airport, not a citywide Seoul reading, so traders are really pricing a single airport weather print in late June. Incheon sits on the northwest coast and is typically a little cooler and more maritime than central Seoul, which matters when comparing platforms: Polymarket’s binary contract is easiest to read as a yes/no view on the upper temperature band, whereas Kalshi and Betfair usually express the same view through different price conventions, and Smarkets may quote a sharper decimal-odds style market depending on liquidity and access.

Historically, late June in Seoul and nearby Incheon is warm rather than extreme, with typical Seoul daytime highs in the high 20s °C and rising humidity as the month progresses.[1][3] That makes a 0% crowd-implied “YES” plausible if the listed range is for an unusually hot upper bracket, because ordinary early-summer weather often lands below the most aggressive bins while monsoon-season moisture tends to increase cloud cover and suppress maximums.[1][3] AccuWeather’s June outlook for Seoul also places daily highs mostly in the low 30s °C at the top end, which supports a market shaped by whether the airport can push into the very highest listed range rather than merely being warm.[4]

The main catalysts are short-term forecast shifts, especially the arrival of the East Asian summer monsoon, local pressure patterns, and any run of clear, humid days that allow inland heating to spill towards the coast.[1][3] Because the market settles on the highest temperature recorded during the day from Wunderground’s Incheon Intl Airport Station page, the key watchpoint is the intraday forecast path rather than the morning reading; the Korea Meteorological Administration’s short-range updates explicitly track maximum temperature and precipitation probability through the day.[5] On venue mechanics, Betfair and Smarkets typically add exchange-style commission and require broader account verification, while Polymarket’s pricing is shown as implied probability, so a small move in weather expectations can appear very differently across books.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Seoul on June 22? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to Polymarket 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). Polymarket Alternative routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

FAQ

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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.