Highest temperature in Seattle on July 23?

Platform comparison

Market context

Seattle’s July heat profile is usually mild rather than extreme, with typical highs around **75°F** and cool nights near 57°F, so a forecast for a very hot reading at Sea-Tac would normally need an unusually warm synoptic set-up rather than routine summer weather.[1] The market resolves on the day’s highest temperature at Seattle-Tacoma International Airport, so the relevant number is the station maximum rather than the city average, which matters because airport readings can differ from downtown Seattle and from nearby inland areas.[2]

That is why a **0% YES** crowd price should be read against both climate norms and comparable summer-temperature markets: the broad July baseline in Seattle points to mid-70s Fahrenheit, while recent prediction markets on similar Seattle date-specific temperature questions have clustered in the upper-70s rather than at extreme heat bands.[1][4] In other words, the book is likely thin on the far tail unless traders are confident that the airport will post an unusually high maximum for the date.

For traders, the main catalysts are the short-horizon forecast updates that determine whether heat builds into the settlement day, plus the funding rails that affect how quickly new money can reach the market. On a payment-first venue, lower friction from **Klarna**, **SEPA**, or **USDC** tends to matter most when weather news moves late and participants want to top up or withdraw without waiting on card processing or banking cut-offs; that can expand depth quickly, but only if the weather signal is strong enough to justify it. The key dependency is still the airport forecast itself, because a modest shift in projected highs can move a low-probability market more than the underlying seasonal average.

Sources: 1 · 2 · 3 · 4

Methodology

This page compares Highest temperature in Seattle on July 23? 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

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.

What's the minimum deposit?

10 EUR / 10 USD equivalent. No upper limit, but deposits over $1,500 lifetime volume trigger a quick KYC flow (typically 5-10 minutes).

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).

Are payment details protected?

Yes. Card and bank details are never stored by Polymarket Klarna UK — they pass directly through PCI-DSS compliant payment service providers (Adyen, Stripe). Polymarket Klarna UK retains only transaction IDs and Klarna reference numbers for reconciliation.