Highest temperature in London on June 16?

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Market context

On 16 June 2026, the highest temperature recorded at London City Airport will fall into one of several defined ranges. The crowd currently assigns zero probability to any outcome, suggesting either extreme uncertainty about the settlement mechanics or insufficient liquidity to establish a baseline. London's June weather typically peaks between 20–24°C, though heat waves can push readings into the high 20s or low 30s.

Historical June records for London show considerable variability. The UK Met Office data indicates that June temperatures at London stations have ranged from around 15°C on cooler days to 32°C during exceptional warm spells. The summer of 2022 saw record-breaking heat across southern England, with some stations exceeding 35°C by late June, though this remains an outlier. Most June days cluster in the 18–23°C band, making mid-range brackets statistically more probable than extreme highs or lows. The 0% crowd probability likely reflects traders waiting for clearer range definitions or resolution source confirmation rather than genuine confidence in any particular outcome.

Traders should monitor the UK Met Office's seasonal outlook for spring 2026 and any Atlantic weather pattern forecasts published in the months preceding the settlement date. La Niña or El Niño conditions, if established by early 2026, could influence European summer temperatures. The specific resolution source—Wunderground's historical data for London City Airport—requires verification that this station will remain operational and reporting throughout June 2026. Any disruption to data collection at this location could complicate settlement.

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

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 Who Will Win 2026, 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?

Who Will Win 2026 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 does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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.