Highest temperature in London on June 2?

Market context

On 2 June 2026, the highest temperature recorded at London City Airport will fall into one of several defined ranges. The crowd currently assigns 0% probability to the YES outcome, suggesting either extreme confidence in alternative ranges or insufficient liquidity driving the market to an edge case. London's June temperatures typically range from 18–23°C, with occasional peaks above 25°C during warm spells, making the distribution of outcomes across multiple ranges a standard feature of such markets.

Historical data from the Met Office and Weather Underground shows London experiences high variability in early June. The 30-year average maximum for early June sits around 20°C, though the city has recorded temperatures exceeding 28°C in June during warm years (notably 2022 saw June peaks near 32°C). The specific resolution source—London City Airport Station—tends to record slightly higher readings than central London due to its location and urban heat characteristics. A 0% crowd probability suggests either the YES range sits at an extreme tail (very high or very low), or traders have concentrated conviction elsewhere.

Traders should monitor the Met Office extended forecast as early June approaches, particularly any signals of high-pressure systems or Atlantic weather patterns that could drive anomalous warmth. The UK's recent climate trend shows increasing frequency of June temperatures in the 25–28°C band, which may warrant reassessing whether current probabilities reflect this shift or remain anchored to older baselines. Settlement depends on Wunderground's historical data feed remaining accessible and accurate through the resolution window.

Methodology

This page reviews Highest temperature in London on June 2? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to PolyGram, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Resolution source: This market settles from the official publication at https://www.wunderground.com/history/daily/gb/london/EGLC. A proposer submits the result to the UMA Optimistic Oracle on Polygon, the two-hour challenge window opens, and the smart contract pays out in USDC.

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.