Highest temperature in London on August 15?

Platform comparison

Market context

London's highest temperature on 15 August 2026 will be measured at City Airport and recorded in Weather Underground's Daily Observations table, with settlement occurring at midday UTC. The current 0% crowd probability reflects genuine uncertainty about whether the market will attract sufficient liquidity before the event window closes. Prediction markets on specific weather outcomes historically struggle with depth when they require precise instrumental readings rather than broad seasonal forecasts; traders need confidence that they can exit positions without slippage, and that confidence depends on steady deposit flows funding the order book.

Historical August temperatures in London cluster between 20–26°C, with extremes rarely exceeding 28°C. The 2022 heatwave pushed readings to 40°C across parts of the UK, but London itself peaked at 35.1°C that summer. City Airport's maritime location moderates peaks compared to inland stations, typically reducing daily highs by 1–2°C relative to central London figures. These precedents establish the realistic range; any market resolution above 30°C would mark an exceptional event, whilst readings below 18°C would signal unusual summer weakness.

Traders monitoring this market should track the Met Office's seasonal outlook for summer 2026, due publication in June, alongside Atlantic pressure patterns in early August. Payment friction remains material: traders using SEPA transfers or Klarna's deferred settlement rails may face timing constraints if they need to adjust positions in the final week before settlement. Book depth will likely remain thin unless deposit incentives or promotional campaigns drive fresh capital into weather-category markets during the summer months.

Methodology

This page compares Highest temperature in London on August 15? 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.

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.

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).