Highest temperature in London on June 12?

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Active sub-markets

Market context

On 12 June 2026, the highest temperature recorded at London City Airport will fall into one of several defined ranges. The settlement mechanism pulls historical data from Weather Underground's daily archive for that specific station, requiring traders to verify the exact reading once the day concludes and the data populates. This is a straightforward factual resolution: a single daily maximum temperature in Celsius, matched against predefined brackets.

London's June temperatures typically range between 18–24°C, with occasional peaks above 25°C during warmer spells. The 0% crowd probability suggests either extreme confidence in a specific range or insufficient liquidity across all brackets. Historical June data from City Airport shows that temperatures exceeding 28°C occur roughly once every three to four years; readings above 30°C are rare but not unprecedented. Traders evaluating this market should cross-reference Met Office seasonal outlooks and comparable June patterns from 2015–2025 to calibrate which ranges carry genuine tail risk versus consensus expectations.

The key dependency is the Atlantic weather pattern in early June 2026—specifically whether high-pressure systems establish over the UK or whether Atlantic lows dominate. The Met Office's long-range forecast, typically updated fortnightly, will provide the most actionable signal three to four weeks before settlement. For programmatic approaches, integrating Weather Underground's API alongside ensemble model outputs (GFS, ECMWF) allows conditional order placement: traders can automate bracket selection once deterministic forecasts converge within seven days of the event. The settlement window closes at midday UTC, so final readings must be confirmed by that deadline.

Methodology

We track Highest temperature in London on June 12? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Bot 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.