Highest temperature in London on July 14?

Platform comparison

Market context

On 14 July 2026, the highest temperature recorded at London City Airport will determine the settlement range for this market. The resolution mechanism pulls directly from Wunderground's historical weather database for that specific station and date, with settlement occurring in USDC once the calendar day closes at 12:00 UTC. The 0% crowd probability suggests traders are either heavily weighted toward a specific temperature band or the market has seen minimal activity; either way, the outcome hinges entirely on meteorological conditions rather than on-chain mechanics or macro volatility.

London's July temperatures have historically ranged between 20°C and 32°C, with extreme heat events (above 30°C) occurring roughly once every three to five years during summer months. The 2022 heatwave pushed readings above 40°C across parts of the UK, though London City Airport itself recorded lower peaks due to its riverside location and urban microclimate. Comparable July days at this station typically settle in the 22–28°C band, making outlier ranges either well above or below historical norms the key decision points for traders positioning now.

The Met Office publishes extended forecasts approximately two weeks before the target date; traders should monitor their 14-day outlook released around late June 2026 for any signals of high-pressure systems or Atlantic weather patterns that could drive anomalous heat. Seasonal factors—including solar activity, ocean temperatures, and jet stream positioning—will be material to the final reading. Wunderground's historical archive remains the sole authoritative source, so traders should verify station continuity and data quality before settlement.

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 — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.

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

What are crypto prediction markets?

Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.

What does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

How does UMA secure the resolution?

The UMA Optimistic Oracle uses a bond system: a proposer posts a bond, a two-hour challenge window opens. On dispute the losing side forfeits the bond — financial incentive for honest resolution.

How volatile are crypto prediction markets?

Crypto markets react to spot prices — a 5% BTC move typically shifts a "BTC above X by date" market 10-20%. Polymarket crypto market liquidity is usually six-figure USD, sufficient for active trading.

Which crypto markets exist on Polymarket?

Currently active markets include BTC/ETH/SOL price targets, halving dates, ETF approvals, hard-fork outcomes and Layer-2 TVL thresholds. The list updates weekly; biggest volume sits on BTC and ETH price forecasts.