Highest temperature in London on June 22?

Platform comparison

Active sub-markets

Market context

The event is the **highest temperature recorded at London City Airport** before the settlement window closes, and the live picture points to a hot day rather than a marginal call. BBC Weather is already showing London City Airport at **13°C** in current observations, while its day forecast for Monday 22nd June reaches **28°C**, and the Met Office has issued a **30°C** maximum for the airport, so the market is being framed by a clearly warm synoptic setup rather than a near-term cold reversal.[2][5]

Against that backdrop, the crowd-implied probability of **0% YES** looks hard to reconcile with the weather guidance if the contract’s “YES” corresponds to a higher temperature band, because comparable late-June London days can still print a wide range when sunshine, cloud cover and showers compete. Climate normals from WeatherSpark show that mid-to-late June sits inside London’s warm season, with average daily highs above 67°F from **16 June to 8 September**, which means the distribution is usually centred around warm afternoons, not extremes; in practice, that makes the exact outcome sensitive to the day’s cloud cover, sea-breeze influence and any shower development.[4]

For traders, the main catalysts are the **latest airport observations**, the **hour-by-hour forecast updates** and any shift in the afternoon shower risk, because the contract resolves on the day’s peak reading rather than a daily average. The BBC and Met Office pages already show materially warm expectations, while the NOAA current-conditions feed for EGLC gives recent temperature prints around the low 20s Celsius, which leaves room for a higher daytime maximum if clearing develops.[2][5][9] In cross-platform terms, that creates a noticeable gap between a zero-priced prediction-market outcome and the more bullish weather guidance, with no sportsbook line provided here to anchor a direct comparison.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Is this market available outside the US?

Best Prediction Markets 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 Best Prediction Markets?

Zero. Best Prediction Markets 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.

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.