Highest temperature in London on May 30?

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Active sub-markets

Market context

London's highest temperature on 30 May 2026 will be measured at City Airport Station and resolved against historical records from Wunderground. The settlement window closes at 12:00 UTC on that date, with USDC payouts distributed to holders of the correct temperature bracket. Current crowd pricing reflects minimal conviction around any specific range, suggesting either genuine uncertainty or sparse trader participation in this niche weather contract.

May temperatures in London typically range between 15–22°C, though outliers occur. Historical data from the past decade shows late May highs clustering around 18–20°C, with occasional spikes to 24–26°C during warm spells. The 0% implied probability on the current bracket suggests traders are either avoiding the contract entirely or waiting for clearer atmospheric signals before committing capital. Weather prediction markets often see late positioning as the settlement date approaches, particularly when meteorological forecasts narrow uncertainty bands.

The key dependency is the UK Met Office's extended forecast, which will sharpen considerably in the week preceding 30 May. Traders should monitor Atlantic pressure systems and any blocking highs that could drive continental air masses northward—conditions that historically produce the warmest May days in London. Funding rates on weather-linked derivatives across major exchanges remain subdued, indicating limited macro hedging demand tied to this specific event. Resolution hinges entirely on Wunderground's historical data feed for EGLC station, making data availability and feed integrity the primary operational risk.

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.

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.

What does it cost to trade on BTC Prediction?

Zero. BTC Prediction 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, 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.