Highest temperature in London on June 24?

Platform comparison

Active sub-markets

Market context

The real-world event hinges on the peak temperature recorded at London City Airport on 24 June 2026, with the crowd currently assigning a 77% probability that the high will stay at or below 35°C. This leans heavily on the immediate weather pattern: BBC Weather reports extreme heat with a red warning, yet forecasts suggest conditions will remain warm and muggy under clear skies rather than spiking into the 38°C band, which would cap readings if an Atlantic front arrives [4].

Historical context frames this probability against recent comparable cases, such as the 17°C maximum recorded on 6 June under unsettled post-May conditions, where the market assigned 100% certainty to that outcome [2]. Conversely, the 23 June daily report showed a maximum of 33.9°C, indicating the current heatwave is pushing temperatures near the 35°C threshold without breaching the 38°C band seen in other volatile heat events [8]. Traders should monitor the Met Office forecast for Wednesday, which predicts a 37°C high, as a divergence between this projection and the actual 24 June reading could shift the settlement [7].

Catalysts for the contract include the timing of any Atlantic front arrival and the specific humidity levels, which are currently at 88% and could suppress peak temperatures despite the clear skies [4]. While on-chain mechanics settle in USDC with BTC/ETH macro ties, the primary dependency is the Wunderground data release for the London City Airport Station, which will definitively resolve the temperature range [6]. Whale flows may react if funding rates on crypto exchanges suggest a broader risk-off sentiment, but the weather dependency remains the sole settlement driver for this specific contract.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — are listed with their platform attributes, because they operate off-chain and a 1:1 comparison of contract mechanics isn't possible.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

Is this market available outside the US?

BTC Prediction 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's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

Do I need to KYC for this market?

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

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.