Highest temperature in London on August 14?

Platform comparison

Market context

The market seeks to establish which temperature band will contain the highest reading recorded at London City Airport on 14 August 2026, using Weather Underground's Daily Observations table as the authoritative source. The settlement window closes at midday on the resolution date, meaning afternoon temperature peaks occurring after 12:00 UTC will not factor into the outcome. Current crowd pricing reflects 0% implied probability across all temperature ranges, suggesting either insufficient liquidity or a data-loading issue rather than genuine consensus that no temperature will be recorded.

August temperatures at London City Airport historically range between 18°C and 27°C, with daily highs typically clustering in the 22–25°C band during mid-August. The 0% crowd probability diverges sharply from typical sportsbook and meteorological expectations, which would ordinarily assign meaningful odds to multiple temperature brackets. This discrepancy warrants caution: traders should verify that all available temperature ranges are properly listed and that the market interface is functioning correctly before committing capital.

The UK Met Office publishes extended forecasts approximately ten days ahead of the target date, with meaningful updates arriving in late July and early August 2026. Traders monitoring this contract should track Atlantic weather patterns and jet-stream positioning in early August, as these drive temperature variance across south-east England. Any unusual heat dome or cold incursion affecting the British Isles during that fortnight would shift the probability distribution materially. The specific reliance on Weather Underground's Daily Observations table—rather than the Day High & Low summary—introduces a minor technical dependency that should be cross-checked against historical station data to ensure consistent measurement methodology.

Methodology

This page reviews Highest temperature in London on August 14? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Best Prediction Markets, which mirrors 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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Best Prediction Markets. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.

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.