Highest temperature in London on June 6?

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Market context

London's temperature on 6 June 2026 will be recorded at City Airport, with settlement based on the highest reading that day. The 0% crowd probability suggests traders are either uncertain about which temperature band will occur or the market has seen minimal activity. Early June in London typically sees maximum temperatures between 18–22°C, though heat waves can push readings into the mid-20s or occasionally higher.

Historical data from the Met Office shows that early June temperatures at London City Airport have ranged from 14°C to 27°C over the past two decades, with most years clustering around 19–21°C. The 27°C reading in 2006 remains an outlier during this period. June itself is transitional; whilst spring weather patterns still dominate, Atlantic systems can stall or high-pressure systems can establish themselves, creating variability. The current flat probability distribution suggests the market awaits clearer seasonal forecasting signals.

Traders should monitor the UK Met Office's extended outlook in late May and early June, which will clarify whether a ridge of high pressure or a low-pressure system dominates the period. The North Atlantic Oscillation index and sea-surface temperatures in May will influence whether June 6 falls within typical range or experiences anomalous warmth. Real-time weather models become reliable only 10–14 days before the date, so meaningful probability shifts are unlikely until late May.

Methodology

We track Highest temperature in London on June 6? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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 Prediction Today, 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, Prediction Today 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.