Highest temperature in London on June 22?

Platform comparison

Active sub-markets

Market context

The relevant real-world event is the highest temperature recorded at London City Airport during the June 22 measurement window, with settlement tied to the Wunderground daily history page for EGLC rather than a live cash-market price or a general London reading. With the current crowd-implied probability at 0% YES, the market is effectively pricing in that the reported daily high will not land in the YES range, which is a notable stance given that London airport highs can move quickly on the back of short-lived clear spells and wind shifts. [2][3]

Historical framing matters here because late-June London temperatures often sit in the low-to-mid 20s Celsius, but the city has also produced sharper spikes during warm continental air episodes. Earlier 2026 London heat has already shown how quickly expectations can reset: the Met Office said 26.6C at Kew Gardens made it the hottest day of the year so far in late May, which is a useful reminder that a 0% market can still be exposed to a single strong afternoon if the synoptic set-up turns favourable. [5][9]

For traders, the key catalysts are the day’s observed runway-side temperatures, cloud cover, rainfall risk, and any late changes in forecast guidance from the Met Office or BBC Weather for London City Airport, since the settlement source is the airport station itself. On accessibility, German GlüStV rules can affect whether a user can access or use a prediction-market venue from Germany, while US CFTC reach is relevant where a platform is treated as offering derivatives-like event contracts to US persons; “no-KYC up to $1,500” generally means smaller accounts may be able to enter or withdraw within that threshold without full identity verification, but it does not remove jurisdiction, tax, or platform compliance limits for this market. [1][3]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in London on June 22? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Polymarket Tax UK — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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 Polymarket Tax 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 Tax 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'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.

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 Tax UK triggers a quick verification flow that finishes in minutes.