Highest temperature in London on June 22?

Platform comparison

Active sub-markets

Market context

The underlying event is the **highest temperature recorded at London City Airport** during the specified settlement window, with resolution based on Wunderground’s daily history for that station. Current pricing is concentrated in the **27°C** range, which fits a warm-summer setup rather than an extreme heat outcome, and the short window means a late-afternoon spike matters more than the day’s average.[1]

For framing, a **0% YES** crowd-implied price is usually best read as either a stale book or a market where traders believe the likely settlement bucket is not the one labelled “YES” in the usual sense; for weather contracts, the key comparator is the forecast distribution, not headline sentiment. Recent comparable London temperature markets have been highly directional when official forecasts were clear, with one June market fully pricing a single outcome and another clustering around a modest high rather than a broad spread, which is consistent with how meteorological certainty can compress probabilities close to settlement.[2] Under German **GlüStV** rules, access can be constrained if the platform is treated as offering regulated gambling activity, while the US **CFTC** can assert jurisdiction where a contract is viewed as a commodity derivative; in practice, that regulatory uncertainty is part of the market’s accessibility backdrop rather than its price formation.

Traders should watch the final urban forecast updates, Heathrow and central-London model runs, and any thunderstorm or sea-breeze adjustments, because those can shift the daily maximum by a degree or two without changing the broader heat regime. Polymarket also notes that its **no-KYC up to $1,500** feature means smaller-volume participation can be friction-light, but larger positions or withdrawals may still trigger identity checks, which affects how easily some users can enter or scale exposure in this market.[1]

Sources: 1 · 2 · 3 · 4 · 5

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 Polymarket Legal UK, which mirrors the Polymarket order book directly.

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

Where can I trade this market with the lowest fees?

On Polymarket Legal 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?

Polymarket Legal 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.

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, Polymarket Legal UK 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.