Highest temperature in London on June 13?

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Market context

On 13 June 2026, the highest temperature recorded at London City Airport Station will fall into one of several defined ranges. The settlement mechanism pulls directly from Weather Underground's historical data feed for that specific monitoring station, which sits in East London and captures conditions across the financial district and surrounding areas. Traders will need to verify the Celsius reading on the platform's linked source page after the settlement window closes at noon UTC on that date.

London's June temperatures have historically clustered between 18–24°C for daily highs, though outliers occur. The Met Office's 30-year climate normals show mid-June averages around 21°C, with extremes ranging from 11°C in cooler years to 28°C during heat waves. The 0% crowd probability suggests either insufficient liquidity or genuine uncertainty about which temperature band will resolve. For programmatic traders, this creates an opportunity to model seasonal patterns and recent anomalies: the UK experienced above-average temperatures in June 2022 and 2023, whilst 2024 saw more typical conditions. Historical volatility in early-summer forecasts means conditional orders tied to Met Office five-day forecasts issued in early June would be more reliable than static position-setting.

Traders should monitor the UK's Atlantic weather patterns in early June 2026, particularly the position of high-pressure systems and any tropical moisture advection from the south. The Met Office issues detailed forecasts roughly ten days ahead; checking those outputs around 3–4 June will provide the strongest signal for range selection. Station-specific readings can vary from broader regional forecasts, so cross-referencing with nearby monitors (Heathrow, Stansted) helps calibrate expectations for the City Airport location.

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

Where can I trade this market with the lowest fees?

On Polymarket App 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.

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.

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, Polymarket App 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.