Highest temperature in Seoul on June 30?

Platform comparison

Market context

Seoul will experience its peak daytime heat on 30 June 2026, with the Incheon International Airport station recording the definitive temperature for the prediction market. Historical data shows June highs in Seoul typically climb from 77°F to 81°F, rarely exceeding 87°F, while the average daily solar energy gradually decreases as the month progresses[1]. The current crowd-implied probability of 0% for a specific high range suggests traders are betting against an extreme outlier, yet recent records contradict this caution: South Korea just recorded its hottest June average since 1973 at 22.9°C, and 59 cities saw record-breaking heat in July 2025, with one day hitting 41.0°C in Hongcheon[4][2][6].

Traders must monitor the official Wunderground release for the Incheon station at 12:00 UTC on 30 June, as this is the sole resolution source for the market[2]. The primary catalyst is the approaching monsoon front, which often suppresses peak temperatures in late June, though the 2025 trend of prolonged heatwaves indicates a potential for sustained high readings if the front delays[6]. Recent news from Yonhap confirms that South Korea’s heat records are accelerating, with the hottest June day since 1904 occurring just last year, meaning the 0% probability may underestimate the risk of a record-breaking day if atmospheric conditions align with the 2025 pattern[4][6]. The market’s depth is directly tied to funding flows from Klarna and SEPA deposits, as liquidity increases when traders anticipate volatility in these temperature-dependent settlement windows.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Seoul on June 30? with a focus on payment rails and deposit friction. Polymarket accepts USDC on Polygon only; Kalshi only ACH/Plaid (US only); Betfair card/SEPA in EU/UK; Manifold no deposit. Polymarket Klarna UK additionally offers Klarna and SOFORT as fiat on-ramps to USDC. Live odds reflect the Polymarket order book.

Resolution & payout

Settlement path determines payout latency. Polymarket settles on-chain (USDC, minutes). Broker frontends like Polymarket Klarna UK add Klarna/SOFORT as fiat withdrawal options with T+1 processing. Kalshi: USD via ACH (T+1 to T+3). Betfair: local currency via card/SEPA (T+1 to T+5).

FAQ

How does Klarna deposit work on Polymarket Klarna UK?

You enter the deposit amount in EUR/GBP, choose Klarna as the method, run through Klarna's standard authentication (Pay Later or Direct Bank Transfer), and Polymarket Klarna UK converts internally to USDC for the Polymarket order book. Processing: typically under 30 minutes.

Which payment methods are supported?

Klarna (Pay Now / Pay Later), SOFORT, SEPA bank transfer, credit card (Visa/Mastercard), Apple Pay, Google Pay, and direct USDC deposit on Polygon. Availability depends on your jurisdiction.

How fast is SEPA deposit?

SEPA Instant: under 10 seconds. SEPA Standard: 1-2 business days. Both accepted fee-free; the internal USDC conversion runs automatically once EUR lands in the platform account.

Can I deposit with a credit card?

Yes, Visa and Mastercard. Credit card deposits carry a ~2.5% acquirer surcharge (standard for card payments). Apple Pay and Google Pay run on the same card rails — same surcharge.

How do withdrawals work?

Identical methods in reverse. SEPA withdrawal: T+1 (standard) or under 10 seconds (SEPA Instant). Klarna withdrawals process via bank-account refund. USDC withdrawal to external wallet: Polygon gas cost (typically $0.01).