Highest temperature in London on June 17?

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Market context

On 17 June 2026, the highest temperature recorded at London City Airport will fall into one of several defined ranges. A YES share in this market pays out if the actual peak temperature matches your chosen bracket; a NO share pays if it lands elsewhere. The settlement source is Wunderground's historical weather database for that specific station, which records hourly readings throughout the day. Traders are essentially wagering on whether London will experience a cooler, moderate, or warmer-than-average June afternoon.

London's June temperatures typically peak between 20–24°C, though extremes have occasionally pushed toward 28–30°C during heat waves. The 0% crowd probability suggests traders are currently uncertain about which range will resolve, or the market may have insufficient liquidity to establish consensus. Historical June data from the Met Office shows that temperatures above 25°C occur roughly once every three to five years in mid-June, whilst readings below 18°C are less common but not rare during unsettled Atlantic weather patterns.

The key variable is the large-scale atmospheric setup in mid-June 2026. High-pressure systems anchored over continental Europe would drive warm air northwestward into the UK, favouring higher temperature brackets. Conversely, Atlantic low-pressure systems or northerly flow would suppress readings. Long-range weather models become increasingly unreliable beyond two weeks, so traders should monitor seasonal forecasts from the UK Met Office and European centres as June approaches. Any significant heat-wave warnings issued in early June would shift market expectations materially.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

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 Prediction Market UK?

Zero. Prediction Market 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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Prediction Market UK triggers a quick verification flow that finishes in 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.