Highest temperature in London on June 6?

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Market context

On 6 June 2026, the highest temperature recorded at London City Airport Station will fall into one of several defined ranges. The settlement will draw from Wunderground's historical weather database, which logs daily highs at this specific location in central East London. The 0% crowd probability suggests traders currently expect no outcome within the lowest temperature bracket offered, though the full range of possible outcomes remains open until the settlement window closes at noon UTC on that date.

London's June temperatures have historically clustered between 18°C and 24°C, with occasional peaks above 25°C during warm spells. The 30-year average high for early June stands near 21°C. Comparable markets on UK weather events show that crowd probabilities often compress toward mid-range outcomes when historical volatility is moderate; extreme highs (above 28°C) occur roughly once every three to four years in London during this month, whilst readings below 15°C are rare but not unprecedented. The current zero probability on the lowest bracket may reflect baseline expectations rather than genuine forecasting confidence.

Traders should monitor the UK Met Office's extended forecast, typically updated five to seven days before the event, which will provide the most reliable guidance on atmospheric patterns and high-pressure systems affecting south-east England. Late May and early June 2026 weather models, once available, will be critical; any signals of continental high pressure or warm air advection from the south could shift probabilities materially. The settlement depends entirely on Wunderground's recorded data from the airport station, making source verification essential before any resolution dispute.

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 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.

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 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.