Highest temperature in London on August 3?

Platform comparison

Market context

The reading will be set by the **highest temperature at London City Airport** on 3 August, so the key question is whether the day peaks in the **low 30s Celsius** or stalls a degree or two lower. With the settlement source tied to Wunderground’s station record rather than a citywide average, short-lived local effects matter: sun angle, cloud timing, sea-breeze suppression, and whether the airport sits just ahead of or behind the warmest inland air. [2][10]

The current **0% YES** crowd price sits far below the recent temperature backdrop for London. The Met Office said daily maximum temperatures across the UK were already running **2.1°C above average** in summer 2026, while BBC reporting on the heat spell noted southern England was projecting **upper 20s to lower 30s Celsius**, with some places potentially reaching **35°C**. London’s own 2026 summer has already produced a **26.6°C** hottest day at Kew Gardens, which is warm but still below the sort of airport-level peak needed for the upper bands in this market. [13][17][3]

For traders, the main catalysts are the **latest Met Office and model updates** into the morning run, plus any shift in the Southeast pressure pattern that would keep cloud and a breeze off the Thames corridor. In practical market terms, this also links to funding flow: when weather markets attract fiat deposits that clear quickly through **Klarna** or **SEPA**, or quicker exits via **USDC**, liquidity tends to thicken and the book can reprice sharply as forecasts firm up. The market’s depth will therefore depend as much on on-ramp convenience and withdrawal rails as on the forecast itself. [2]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in London on August 3? 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

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 I deposit with a credit card?

Yes, Visa and Mastercard. Credit card deposits carry a ~2.5% acquirer surcharge (standard for card payments). Apple Pay and Google Pay run on the same card rails — same surcharge.

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).