Highest temperature in Seattle on August 9?

Platform comparison

Market context

Seattle’s hottest reading on 9 August has effectively settled into the upper-70s, with Weather Underground’s KSEA daily observations showing a 77°F maximum and the market already priced almost entirely into the 76–77°F band. That matters because the contract resolves off the airport station’s *Daily Observations* table, not the headline “Day High & Low” figure, so the relevant trading question is whether late updates alter the station record before the following day’s first datapoint is published.[1][7]

The current 0% YES probability for other bands is best read against Seattle’s usual August profile: long-run normals around the high-70s at the airport, with marine influence often capping inland heat even on sunny days. Comparable temperature markets tend to compress quickly once midday observations land, especially when airport data and forecast guidance line up; here, the reported 77°F sits close to the monthly average and below the kind of heat that would pull volume into higher bands.[2][5][6]

For traders focused on funding flows, the main catalysts are not weather surprises so much as payment friction and settlement speed around a market that has already largely priced the outcome. Depth tends to improve when deposits clear quickly through low-friction rails such as card-style on-ramps, Klarna, or SEPA, while withdrawals in USDC can make it easier to recycle capital across similar weather contracts; if on-ramp fees are high or fiat withdrawals are slow, books often stay thinner and less reactive. The key operational watchpoint is whether any Weather Underground revision appears before the market’s stated cut-off for accepting changes.[1][7]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Seattle on August 9? 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).

UK Frequently Asked Questions

What does SOFORT cost as a deposit method?

Polymarket Klarna UK charges no fees for SOFORT. The only cost is the internal FX spread (typically <1%) on EUR→USDC conversion. SOFORT itself has no end-user fees — the platform absorbs acquirer costs.

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 UK traders use Klarna to deposit on Polymarket?

Polymarket does not natively accept Klarna. To fund a Polymarket account from the UK, you must first purchase USDC via a crypto exchange (Coinbase UK, Kraken) or Revolut, then transfer to a Polygon-compatible wallet. Some third-party on-ramps (MoonPay, Transak) accept UK debit cards and may support Klarna buy-now-pay-later for crypto purchases.

What payment methods can UK users use for Polymarket?

UK traders typically use: (1) Coinbase UK or Kraken — buy USDC with GBP debit card or bank transfer; (2) Revolut — buy crypto and send to wallet; (3) MoonPay or Transak — Visa/Mastercard UK debit card directly to USDC on Polygon. Standard GBP-to-USDC conversion fees range from 0.5–2.5%.

How long do Polymarket withdrawals take for UK users?

Polymarket withdrawals to your Polygon wallet are instant (on-chain). Converting USDC back to GBP via Coinbase UK or Kraken typically takes 1–3 business days for bank transfer, or near-instant for Revolut. Polygon gas fees are minimal (<$0.01 per transaction).