Highest temperature in London on May 30?

Platform comparison

Active sub-markets

Market context

On 30 May 2026, the highest temperature recorded at London City Airport Station will fall into one of several defined ranges in Celsius. The settlement will draw from Wunderground's historical weather database for that specific location and date, with the resolution window closing at midday UTC. This is a straightforward meteorological outcome with no discretionary element—the temperature either occurs or it does not.

London's late May weather typically ranges between 15–22°C, though anomalies are well-documented. The May 2022 heatwave saw temperatures exceed 28°C across southern England; conversely, May 2019 delivered cooler spells with highs near 16°C. The 0% crowd probability suggests traders are either absent from this market or expect the settlement mechanism itself to face friction rather than doubting the underlying weather event. Historical volatility in spring temperatures means the outcome space is genuinely wide, yet the current odds reflect minimal engagement rather than consensus forecasting.

From a regulatory standpoint, this market's accessibility depends on your jurisdiction and account status. Under German GlüStV rules, prediction markets on weather outcomes face lighter scrutiny than financial derivatives, though operators must still hold appropriate licences. US CFTC reach extends to US persons trading on offshore platforms, though weather derivatives typically sit outside direct CFTC commodity jurisdiction. Most UK-regulated platforms allow participation up to £1,500 without enhanced KYC, meaning casual traders can enter this market with standard identity verification alone. Traders should confirm their platform's specific KYC thresholds and regional compliance posture before committing capital.

Methodology

This page reviews Highest temperature in London on May 30? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Polymarket Tax UK — the application we operate, where you trade directly against 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?

On Polymarket Tax 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.

Is this market available outside the US?

Polymarket Tax 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 Tax UK?

Zero. Polymarket Tax 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 Tax UK triggers a quick verification flow that finishes in minutes.