Pronóstico: Highest temperature in London on June 26?

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Market context

The highest temperature recorded at London City Airport on 26 June 2026 will determine the outcome of this prediction market, with the current crowd-implied probability for the YES side sitting at 0%. This reflects the market’s view that the temperature will fall outside the specified range, likely due to historically typical June conditions in London.

Historically, June in London sees average highs between 11.4°C and 19.6°C, with the hottest day in June 2026 so far reaching 26.6°C at Kew Gardens, southwest London, as reported by the Met Office [3]. However, London City Airport, located further east, typically records lower peaks than inland or southwest sites. The 2026 monthly forecast for the airport suggests similar ranges, with no extreme heat events projected for late June [2]. This context supports the current 0% probability, as the range likely targets a higher threshold than expected.

Traders should monitor the Met Office’s daily weather updates and any sudden shifts in the Atlantic pressure systems, which can drive unexpected heatwaves. A recent Sky News report highlighted the 26.6°C record, underscoring how localized conditions can vary significantly across London [7]. Watch for scheduled announcements on heat action plans and real-time data from Wunderground, the official resolution source, as these will clarify whether the temperature breaches the threshold before the settlement window closes at 12:00 UTC on 26 June.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Pronóstico: Highest temperature in London on June 26? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at PolyGram — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On PolyGram, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

PolyGram is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What does it cost to trade on PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in minutes.