Highest temperature in Seoul on July 11?

Platform comparison

Market context

Seoul faces its peak summer heat on 11 July 2026, with the Incheon International Airport station set to record the day’s maximum temperature in degrees Celsius. The market currently implies a 0% probability for any outcome above the baseline, yet historical data suggests July highs in the region routinely reach the mid-20s to low-30s Celsius, with record-breaking years exceeding 37°C[7]. Polymarket traders are pricing 32°C as the leading outcome at 66%, while 33°C or higher holds 21%[1], a stark contrast to Kalshi’s decimal-odds format and stricter KYC requirements that often suppress speculative volume on weather events.

Comparable cases show Seoul’s July averages hovering between 27°C and 29°C, though humidity can push the “real feel” above 35°C[4]. The Korea Meteorological Administration forecasts a 25°C maximum for 11 July 2026, but monsoon variability means sudden heat spikes remain possible[9]. Traders should monitor real-time updates from Wunderground—the official resolution source—and watch for any anomalous heat advisories from Korean authorities, as recent record-breaking July temperatures in 2023 reached 37.7°C, shattering a 117-year record[7]. Unlike Betfair’s commission-based model or Smarkets’ low-fee structure, Polymarket’s zero-KYC access allows broader participation, inflating implied probabilities on extreme outcomes that traditional books might discount.

The settlement window closes at 12:00 UTC on 11 July, locking in the final temperature reading. With July being South Korea’s wettest and most humid month, cloud cover could suppress highs, yet dry spells often trigger rapid temperature surges[5]. Divergence between platforms is evident: Polymarket’s probability-based pricing highlights 32°C as dominant, whereas Kalshi would express this as 3.20 decimal odds, and Betfair might list it at 1.50 with a 5% commission. These structural differences shape how traders interpret the 0% crowd-implied probability, which likely reflects liquidity gaps rather than genuine meteorological certainty.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Seoul on July 11? 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 UK 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.