Highest temperature in San Francisco on August 13?

Platform comparison

Market context

San Francisco's August weather typically peaks in the mid-to-high 70s Fahrenheit, with occasional heat events pushing into the low 80s. The highest temperature recorded at San Francisco International Airport on any 13 August in the past two decades has not exceeded 84°F, with most years settling between 72°F and 78°F. The 0% crowd probability reflects the rarity of extreme heat during mid-August in the Bay Area, when marine layer influence and coastal cooling patterns remain active. Historical data from Weather Underground shows that temperatures above 85°F on this date are exceptionally uncommon, occurring roughly once per decade or less frequently.

The settlement mechanism hinges on the Daily Observations table at Weather Underground rather than summary figures, a distinction that matters for precision traders. Recent atmospheric patterns across the Pacific coast suggest no anomalous heat dome is forecast for early August 2026. The National Weather Service Bay Area office typically issues extended forecasts by late July, providing traders with updated guidance on potential temperature ranges. Traders depositing via Klarna or SEPA transfers to build positions should expect standard settlement within 24 hours of the 12:00 UTC window closure, with withdrawal rails available across major payment networks.

The current market depth reflects confidence in seasonal norms. Any significant shift in probability would require either an unusual high-pressure system stalling over northern California or a rare combination of inland heating and weakened marine influence—conditions that meteorological forecasts would likely signal by early August.

Methodology

This page compares Highest temperature in San Francisco on August 13? 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.

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.

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).