Highest temperature in London on August 16?

Platform comparison

Market context

The market is pricing the highest temperature at London City Airport on 16 August 2026 at 0% probability across all temperature ranges, suggesting the crowd expects no outcome to materialise or treats the event as effectively impossible. In reality, London will record some maximum temperature that day, making this a mispricing rooted in either technical confusion or extreme underestimation of heat risk during late summer.

Historical August temperatures at London City Airport show the station regularly records highs between 20–28°C, with occasional excursions above 30°C during heat waves. The 2022 heatwave pushed readings to 40°C across parts of London, though City Airport itself typically sits 2–3°C cooler than central London due to proximity to the Thames estuary. August 2023 saw highs around 25–27°C at the airport, whilst August 2024 remained moderate. The 0% crowd probability appears divorced from this baseline range; even conservative forecasts would expect temperatures somewhere between 18–32°C on any given August day.

Traders should monitor the Met Office's seasonal outlook for summer 2026 and any emerging climate patterns in early August. The UK's weather in mid-August typically reflects Atlantic pressure systems and any residual heat from earlier summer; a blocking high-pressure system could drive temperatures toward the upper end of the range, whilst Atlantic lows would suppress them. The resolution mechanism hinges on Weather Underground's Daily Observations table at London City Airport, not summary figures, so familiarity with that specific data feed is essential for accurate settlement expectations.

Methodology

This page reviews Highest temperature in London on August 16? 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 Who Will Win 2026, 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

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.