Highest temperature in London on June 4?

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Market context

London's weather on 4 June 2026 will be determined by Atlantic pressure systems and the North Atlantic Oscillation phase entering early summer. Current meteorological positioning suggests typical early-June conditions for the capital, with the City Airport station recording temperatures influenced by urban heat island effects and proximity to the Thames estuary. The 0% crowd probability reflects genuine uncertainty about which specific temperature band will materialise, rather than confidence in any particular outcome.

Historical June records at London City Airport show the highest temperatures typically fall between 24–28°C, with occasional excursions above 30°C during heat waves. The station's 30-year average high for early June sits around 21°C. The 2022 heatwave saw temperatures exceed 40°C across parts of the UK, though London City Airport recorded lower peaks due to its riverside location and exposure to cooler maritime air. These precedents establish the plausible range: most outcomes cluster in the low-to-mid 20s, with tail risks extending toward 30°C if high-pressure systems dominate.

Traders should monitor the Met Office's extended outlook and Atlantic weather patterns through May 2026, particularly the position of the jet stream and any developing high-pressure ridges. The UK's seasonal transition into summer typically brings more stable conditions by early June, though individual day variability remains substantial. Real-time resolution depends entirely on Wunderground's recorded data from the London City Airport station, making the specific instrument location and measurement protocols the critical dependency for settlement.

Methodology

We track Highest temperature in London on June 4? 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

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 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.

Is this market available outside the US?

Prediction Today 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.

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.