Highest temperature in London on June 9?

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Market context

The highest temperature recorded at London City Airport on 9 June 2026 will determine which range this market settles into, with the reading taken from Wunderground's historical weather database. The 0% crowd probability suggests traders are not backing any specific temperature bracket, likely reflecting uncertainty about conditions nearly two years ahead and the granular nature of daily temperature forecasting at this lead time.

London's June temperatures historically cluster between 18°C and 24°C, though extremes have reached into the high 20s during heat waves. The 2022 heatwave saw London exceed 30°C in early July, whilst June typically remains cooler. The absence of any meaningful probability mass across available ranges indicates the market has attracted limited liquidity rather than consensus bearishness on particular outcomes. Comparable weather markets on major platforms show similar patterns for distant-future single-day temperature events, where crowd-implied probabilities remain diffuse until the forecast window tightens to 10–14 days prior.

The Met Office's seasonal outlook and any June 2026 anomaly forecasts will provide the first material catalyst for repricing, though these remain speculative at present. Traders should monitor whether El Niño or La Niña conditions persist into early summer 2026, as these influence European weather patterns. The settlement window closes at noon UTC on the day itself, meaning final readings depend on morning and early-afternoon temperatures rather than the full 24-hour range, which narrows the possible outcomes compared to markets using daily highs across all hours.

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets UK, which mirrors the Polymarket order book directly.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

On Best Prediction Markets UK, 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?

Best Prediction Markets UK 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 does it cost to trade on Best Prediction Markets UK?

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

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

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