London July 9 Low Temp: Will It Hit Twenty-Two Celsius?

London’s overnight low on July 9 has traders split, and the market is leaning toward cooler outcomes. The 22°C outcome sits at 38.5% implied probability, meaning traders collectively assign a better-than-even chance that the city dips below that mark. Here’s what the measurements are telling us: July nights in London rarely hold above 20°C, so this is genuinely a close call.

The market question is simple: what is the lowest temperature recorded in London on July 9, 2026? The 22°C outcome trades at £0.39 YES and £0.62 NO. The market resolves at 12:00 UTC on July 9. Total volume stands at $2,237, with all of that trading occurring in the last 24 hours.

How the Twenty-Two Celsius Contract Works

This is a multi-outcome market. Each temperature outcome is its own contract. YES on 22°C pays out only if the official lowest temperature recorded in London on July 9 lands exactly at 22°C. Any other reading, whether 21°C, 20°C, 23°C, or anything outside that value, resolves NO. The resolution source is the market operator’s designated weather data feed for London.

• YES (22°C): trades at £0.39, implying 38.5% probability the low lands exactly at this value.
• NO: trades at £0.62, implying 61.5% probability the low lands somewhere else on the temperature scale.

The NO case is straightforward. London’s July low lands at 22°C only in genuinely warm overnight conditions. The UK Met Office climatology for London in July places median overnight lows closer to 15°C to 17°C, with warm spells pushing readings into the low 20s. A reading of 21°C or 23°C would be enough to resolve this contract NO. The margin is a single degree.

Sponsored Partner

Momentum and Market Signals

The momentum composite here is flat. The 1-hour price change is 0.0% and no 24-hour change is recorded separately, but the 30-day price history shows the contract dropped 16.5% on July 7 before recovering 7% the same day. The trend score of 37.15 is below the midpoint of a 0-100 scale, confirming bearish lean. The most likely driver of that intraday swing is updated forecast model output from the European Centre for Medium-Range Weather Forecasts or the UK Met Office, which typically revise London temperature forecasts aggressively within 48 hours of the event.

Total volume is $2,237, which is very thin. The 24-hour volume matches total volume, meaning this market opened and filled entirely today. Liquidity of $24,337 substantially exceeds volume, which means the order book can absorb new trades without large price swings. But with total volume under $1 million, a single large position could reprice this contract immediately. Treat the 38.5% probability as directionally informative, not statistically robust.

• The 1-hour price change is flat at 0.0%, signaling no new information has entered the market in the last hour.
• The 24-hour price action shows a sharp drop and partial recovery on July 7, consistent with a forecast model revision narrowing or widening the temperature range.
• The trend score of 37.15 confirms the market is leaning toward outcomes other than 22°C.
• Liquidity at $24,337 is healthy relative to volume, but thin total participation means this price is not battle-tested.
• No whale trades are on record. All pricing reflects retail-scale participation only.

Lines Analysis: London’s July Night and the Degree That Matters

The case for 22°C rests on current UK weather patterns. July 2025 saw several nights in London where the overnight low held between 20°C and 23°C during heat episodes. If an anticyclone is positioned over southern England on the night of July 8 into July 9, radiative cooling will be suppressed and overnight temperatures can stall in the low 20s. The market’s 38.5% on a single-degree outcome is not unreasonable under those synoptic conditions.

What makes the NO side compelling is basic meteorological math. The probability is spread across eleven outcomes, from 18°C or below through 28°C or higher. For NO to pay, the low needs to land anywhere except 22°C. That is a ten-to-one distributional advantage for NO before considering that London’s climatological median overnight low in July is well below 22°C. Cooler synoptic setups, cloud cover, or any precipitation would push the reading to 20°C or below, immediately resolving NO.

• A UK Met Office forecast revision toward a warmer overnight low in the 22°C to 23°C range would push YES higher.
• Any front or trough moving over southern England on July 8 would cool the overnight low and strengthen NO across all outcomes above 20°C.
• European Centre for Medium-Range Weather Forecasts ensemble output for London within 24 hours of resolution is the single highest-value data point this market is waiting for.
• Humidity and cloud cover forecasts matter as much as temperature here. Clear skies enhance cooling; overcast skies suppress it.
• A reading of 21°C or 23°C resolves the contract NO and redistributes value to adjacent outcome markets.

With $2,237 in total volume, this market is thin. The data doesn’t care about the politics, and here the data says the 22°C outcome is plausible but competes against ten other buckets. The order book favors NO, and the meteorological base rate supports that lean.

LINES VERDICT

LEANING NO

London’s overnight low on July 9 could land at 22°C, but eleven possible outcomes and a climatological median well below that mark keep the probability modest. The market has correctly identified this as a live question, not a settled one.

What the market says: The 38.5% implied probability on 22°C reflects genuine meteorological uncertainty in a multi-outcome structure. With resolution in under 48 hours and total volume under $3,000, this price can shift sharply on any new forecast model output before July 9.

Key unknown: The UK Met Office or European Centre for Medium-Range Weather Forecasts ensemble update for London overnight temperatures on July 8 to July 9 is the single data release that will reprice every outcome in this market.