Highest temperature in London on June 17?

Platform comparison

Active sub-markets

Market context

The highest temperature recorded at London City Airport on 17 June 2026 will determine which temperature band this market resolves to, with settlement based on Wunderground historical data for that specific station and date.

June temperatures in London typically range between 15°C and 23°C, though extremes have occasionally pushed higher. The Met Office records show that mid-June averages around 19–20°C in the capital, with daily highs rarely exceeding 25°C unless an unusual warm spell arrives. Historical precedent suggests most June days cluster in the 18–22°C range; notably warm days above 24°C occur roughly once every few years during this month. The 0% crowd probability reflects the market's current assessment that no single temperature band has emerged as consensus favourite, indicating genuine uncertainty about which range will materialise.

Traders should monitor the Met Office's extended forecast as June 2026 approaches, particularly any alerts for high-pressure systems or continental warm air masses that could drive temperatures above seasonal norms. The UK's weather patterns in early-to-mid June depend heavily on Atlantic weather systems and jet stream positioning; forecasters typically gain reliable confidence only 10–14 days ahead. Any official heat-health alerts issued by the UK Health Security Agency would signal elevated temperature expectations. Settlement hinges entirely on the recorded maximum at London City Airport Station—a specific location whose microclimatic conditions may differ slightly from broader London readings, making local topography and urban heat effects relevant considerations for traders assessing probability distributions.

Methodology

Political prediction markets differ structurally from sports betting: thinner liquidity, longer settlement windows, higher sensitivity to single news events. This page shows the live Polymarket quote for Highest temperature in London on June 17? plus platform attributes for the three reference venues, so you can see at a glance where the deepest market for this question sits.

Resolution & payout

Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.

Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.

FAQ

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.

What does it cost to trade on Election Predictions UK?

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

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.