Highest temperature in London on June 1?

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Market context

This market resolves based on the highest temperature recorded at London City Airport on 1 June 2026, measured in degrees Celsius. The settlement window closes at midday on that date, with resolution sourced from Weather Underground's historical records for the specific station.

London's June temperatures typically range between 15°C and 22°C, though the city has recorded highs exceeding 30°C during heatwaves. The Met Office's long-term climate data shows that temperatures above 25°C occur roughly once every three years in early June, whilst readings above 28°C are considerably rarer. The highest June temperature ever recorded in central London stands at 34.5°C, set in 2015. City Airport, situated on the Thames estuary, tends to register slightly cooler readings than central London due to proximity to water and lower urban heat island effects.

Traders should monitor the UK Met Office's extended forecast issued in late May, which typically provides reliable guidance for temperature ranges five to ten days ahead. The North Atlantic Oscillation and jet stream positioning in early June will substantially influence whether continental warm air reaches the British Isles or whether Atlantic systems deliver cooler, wetter conditions. Historical analogue years—particularly 2015, 2018, and 2022, which saw early summer heatwaves—offer reference points for assessing the probability of extreme June temperatures. Current crowd probability of 0% suggests traders are pricing in below-average conditions, though the specific temperature threshold for this market's YES resolution remains unclear from the available description.

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 1? 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

Is this market available outside the US?

Trump Prediction 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.

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 Trump Prediction?

Zero. Trump Prediction 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, Trump Prediction triggers a quick verification flow that finishes in minutes.