Highest temperature in London on August 17?

Platform comparison

Market context

London's highest temperature on 17 August 2026 will be measured at City Airport Station and recorded in Weather Underground's Daily Observations table, with settlement occurring at midday UTC. The 0% crowd probability reflects the market's nascent stage rather than any meteorological certainty; August typically sees London highs between 20–27°C, though extremes above 30°C have occurred in recent summers.

Historical precedent matters here. The UK recorded 40.3°C in July 2022, and London itself reached 37.8°C in the same heatwave. August 2023 saw temperatures in the mid-to-high 20s across the capital, whilst August 2024 remained cooler. The resolution mechanism—using Daily Observations rather than Day High & Low summaries—introduces specificity that eliminates ambiguity but requires traders to verify source data directly. Early liquidity in weather markets typically builds as the event date approaches; current book depth likely reflects limited deposit activity rather than genuine disagreement on temperature ranges.

Traders monitoring this market should track the Met Office's seasonal outlook for summer 2026 and any Atlantic pressure patterns emerging in late July. Deposit friction on prediction platforms remains material: SEPA transfers, Klarna's buy-now-pay-later rails, and USDC on-ramps each carry different settlement timelines and fee structures. Markets with shallow liquidity often see wider spreads; funding inflows through faster payment rails (Klarna same-day settlement versus SEPA's 1–2 day cycle) can shift available capital and tighten ranges as August approaches.

Methodology

This page compares Highest temperature in London on August 17? 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

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.

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).