Highest temperature in London on June 17?

Platform comparison

Active sub-markets

Market context

On 17 June 2026, the highest temperature recorded at London City Airport will determine which range this market settles into. The settlement window closes at midday, capturing the peak temperature for that calendar day as logged by Wunderground's historical weather database for the EGLC station.

London's June temperatures typically range between 18–23°C, though heat waves can push readings into the high 20s or occasionally above 30°C. The 0% crowd probability suggests traders expect the highest temperature to fall below the lowest available range option, though this warrants scrutiny given that June is meteorologically summer in the Northern Hemisphere and London has experienced temperatures exceeding 25°C on mid-June dates in recent years. The 2022 heatwave saw June peaks near 32°C across southern England, establishing that extreme outliers remain plausible rather than impossible.

Traders should monitor the UK Met Office's extended forecast as mid-June 2026 approaches, particularly any alerts for high-pressure systems or continental air masses that could drive temperatures upward. Atlantic weather patterns in early June will signal whether warm southerly flows are likely to establish by mid-month. The current 0% reading may reflect either genuine confidence in cooler conditions or insufficient liquidity in the market; historical precedent suggests June temperature ranges in London warrant non-trivial probability across multiple brackets rather than concentration at zero.

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On Champions League Prediction, 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?

Champions League Prediction 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, Champions League Prediction 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.