Highest temperature in London on June 30?

Platform comparison

Market context

The real-world event this market tracks is the peak temperature recorded at London City Airport on 30 June 2026, measured in degrees Celsius. With the current crowd-implied probability for a "YES" outcome sitting at 0%, the market suggests traders see virtually no chance of the temperature exceeding the defined threshold, likely due to today’s forecast of a 23°C high and unsettled conditions.

Historical data frames this low probability clearly: June in London typically averages highs near 20°C, though recent years have seen extreme spikes, including the UK’s all-time June record of 36.1°C broken this month. Despite that record, the current forecast for 30 June shows a gentle breeze, 88% humidity, and a maximum of 23°C, aligning with the market’s scepticism about a heatwave. Traders should watch for sudden Met Office updates or BBC Weather revisions, as any shift toward a 30°C+ forecast could drastically alter book depth. A recent AOL report noted airport chaos during the hottest June day, when 37.3°C was recorded, highlighting how quickly weather can disrupt funding flows and on-ramp friction for payment rails like Klarna and SEPA.

The catalysts to monitor include official Met Office announcements and any sudden changes in the southerly wind pattern, which could bring warmer air from the continent. If temperatures climb above 30°C, the market’s traction could surge, driven by the same funding flows that deepen books on high-impact weather events. Traders must note that settlement ends at 12:00 UTC on 30 June 2026, leaving little room for late adjustments in deposit or withdrawal rails.

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Methodology

This page compares Highest temperature in London on June 30? 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

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.

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.

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).

Are payment details protected?

Yes. Card and bank details are never stored by Polymarket Klarna UK — they pass directly through PCI-DSS compliant payment service providers (Adyen, Stripe). Polymarket Klarna UK retains only transaction IDs and Klarna reference numbers for reconciliation.