Highest temperature in London on August 1?

Platform comparison

Market context

The event is the **highest temperature at London City Airport on 1 August 2026**, measured in Celsius and resolved against the day’s peak reading on Wunderground’s history page for EGLC. With the market still priced at **0% YES**, the crowd is effectively saying there is no live signal yet, so a programmatic approach would treat this as a blank slate: ingest the daily forecast, watch intra-day updates, then compare the observed maximum against the market’s outcome buckets as the settlement window closes.

For framing, London’s early-August climate usually sits in the low-to-mid 20s Celsius rather than at extreme heat. WeatherSpark puts 1 August in London in a typical range of about **60°F to 74°F** (roughly **16°C to 23°C**), while historical UK records show that August can still produce very hot spikes, with the national August record at **38.5°C** and London-area highs above **38°C** in exceptional years.[1][11][12] That makes sub-30°C outcomes far more routine than heatwave tails, and it also explains why a power-user would model this as a narrow distribution around seasonal normals unless a synoptic shift arrives.

The main catalysts to watch are the short-range forecast model runs, any Met Office heat warning, and the timing of cloud, wind, or rain bands that can cap the daytime maximum at an airport station. Polymarket’s own market copy indicates a current centre of gravity around the mid-20s Celsius, with **26°C** leading and a tight cluster around **25°C–27°C**, which is the sort of setup that lends itself to automated order placement and conditional orders if the forecast changes quickly.[2] Since the resolution depends on the highest temperature recorded during the full day at London City Airport, a trader tracking this programmatically would also monitor the publication timing of the next day’s Wunderground datapoints, because late revisions before the following day’s first datapoint can still alter settlement.[2]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in London on August 1? 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 Polymarket Review UK, which mirrors the Polymarket order book at 0% fees.

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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Review UK. 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.

Do I need to KYC for this market?

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