Highest temperature in London on June 1?

Platform comparison

Active sub-markets

Market context

On 1 June 2026, the highest temperature recorded at London City Airport will fall into one of several defined ranges. The settlement mechanism pulls historical weather data from Wunderground's daily records for that specific station, requiring traders to forecast which temperature band will capture the peak reading across the full 24-hour period. The 0% crowd probability suggests either extreme confidence in a particular range or insufficient liquidity across all options.

London's June temperatures typically cluster between 18–24°C, with historical highs occasionally reaching 27–28°C on warmer years. The Met Office's 30-year climate averages show June 1st specifically averaging around 20°C as a daily high, though individual years vary considerably. Examining comparable June 1st records from the past decade provides calibration: the station recorded 23.2°C on 1 June 2019 and 20.1°C on 1 June 2022. These precedents help traders weight probability across mid-range brackets rather than extreme outliers.

Programmatic traders should note that Wunderground's historical data updates daily and becomes final after the settlement window closes at 12:00 UTC on 1 June 2026. The resolution depends entirely on automated data retrieval from a single station rather than broader London measurements, making station-specific weather patterns relevant. Early June weather systems—Atlantic low-pressure systems or high-pressure ridges pushing north from the continent—typically determine whether temperatures stay near the 18–21°C baseline or spike into the 24–27°C range. Conditional order logic should account for overnight lows and morning conditions, as peak temperatures usually occur mid-afternoon.

Methodology

This page reviews Highest temperature in London on June 1? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Polymarket Bot UK — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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 Bot 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?

Polymarket Bot 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 Polymarket Bot UK?

Zero. Polymarket Bot 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 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.