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 fall into one of several defined ranges, measured in Celsius and sourced from Weather Underground's historical database. The Polymarket contract currently shows 0% implied probability across all temperature brackets, suggesting either illiquidity in the conditional token pairs or extreme uncertainty about which range will settle. Traders holding USDC on Polygon can mint conditional tokens representing each temperature band, with payouts determined by whichever bracket contains the actual daily maximum.

London's June temperatures typically range between 18°C and 24°C, though the city has recorded highs exceeding 30°C during heatwaves. The Met Office's 30-year climate average for mid-June sits around 21°C. Historical precedent matters here: in June 2022, London experienced a sustained heatwave with temperatures reaching 32°C, whilst June 2012 saw a cooler pattern with highs averaging 19–20°C. These variations illustrate why the market shows such low confidence—seasonal volatility is genuine, and four years of climate drift make historical baselines less predictive.

The primary catalyst for this contract is the UK Met Office's extended forecast, typically issued 10–14 days before settlement. Traders should monitor whether Atlantic weather systems bring cooler maritime air or whether high-pressure systems establish over the continent, driving continental warmth northward. The settlement window closes at 12:00 UTC on 14 June, meaning the contract resolves based on the highest temperature recorded across the full calendar day, not just business hours. Any significant weather warnings issued in early June would shift conditional token valuations substantially.

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 Kalshi 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.

Is this market available outside the US?

Kalshi UK 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.

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.

What does it cost to trade on Kalshi UK?

Zero. Kalshi UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Kalshi UK triggers a quick verification flow that finishes in minutes.