Highest temperature in London on June 14?

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Market context

On 14 June 2026, the highest temperature recorded at London City Airport will determine which range this market settles into. The settlement mechanism uses Wunderground's historical data feed for that specific station, with traders currently pricing all outcome ranges at zero probability on Polygon—a technical artefact suggesting either illiquidity or genuine uncertainty about whether the market will attract sufficient volume before the settlement window closes at midday UTC.

London's June temperatures have historically clustered between 18°C and 24°C, with extremes rare but documented. The Met Office records show that June 2022 saw a peak of 28.5°C in the capital, whilst June 2019 reached 32.0°C during an exceptional heatwave. City Airport's location on the Thames estuary means it typically records slightly cooler readings than central London stations, often 1–2°C lower during summer peaks. These precedents suggest that outcome ranges centred on 20–26°C will likely capture the settlement value, though the 0% crowd probability reflects the market's current dormancy rather than any meteorological certainty.

The UK's seasonal weather patterns and any Atlantic systems moving through the British Isles during early-to-mid June will be the primary driver. The Met Office's long-range forecast, updated monthly, provides the most reliable guidance for traders seeking to assess tail-risk scenarios. Conditional token mechanics on Polygon mean positions remain illiquid until trading volume increases, but USDC settlement is guaranteed once Wunderground data confirms the day's maximum temperature.

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 Polymarket Scam?, 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 Scam? 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.

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.

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.