Paris Low Temperature July 5: Will 16°C Hit?

Paris weather markets are granular, specific, and driven almost entirely by meteorological data. The question here is narrow: will the lowest temperature recorded in Paris on July 5, 2026 land exactly at 16°C? Traders are pricing that outcome at 36.5% probability, making it the leading single outcome in a field of eleven discrete temperature bands. That’s a meaningful edge in a fragmented market, but it’s a plurality, not a mandate.

The market question asks: Lowest temperature in Paris on July 5? The YES contract for 16°C is priced at $0.37, with the NO contract at $0.64. The market resolves on July 5, 2026 at 12:00 UTC. Total volume stands at $1,358, with all of that trading occurring in the last 24 hours. This is a very new, very thin market.

How the July 5 Paris Temperature Contract Works

Resolution depends on the recorded overnight low temperature in Paris on July 5, 2026. The winning outcome is the single temperature band that matches the actual minimum. Eleven bands are in play, ranging from 14°C or below up to 24°C or higher.

• YES on 16°C pays out if the Paris overnight minimum on July 5 is exactly 16°C, as reported by the resolution source.
• NO on 16°C pays out if the minimum lands anywhere else: 15°C, 17°C, 14°C or below, or any band from 18°C through 24°C or higher.

The NO contract has a 63.5% implied probability. That reflects the mathematical reality of a multi-outcome market: even the leading temperature band leaves most of the probability distributed across ten other outcomes. For NO to pay out, Paris simply needs to record any temperature other than 16°C as its minimum on July 5. That covers a wide range, from an unseasonably cool 14°C or lower to a warm 17°C or higher.

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Momentum and Market Signals in a Thin Order Book

The momentum composite here is essentially flat. The 1-hour price change is 0.0%, and the trend score of 39.81 sits in mild bearish territory for the YES contract. The market has not moved in the last hour. With no multi-day price history to draw from, the signal is quiet: no catalyst has repriced this contract since it opened.

Volume is $1,358 over 24 hours, which is the entirety of this market’s trading history. Liquidity sits at $28,282, which is unusually deep relative to the volume traded. That liquidity overhang means the price could move sharply on a single large order or a fresh weather forecast update. With open interest at $0 and total volume this thin, treat every price signal with caution. This is a market where one informed trader with a current ECMWF model run could reprice the contract significantly.

Key Factors

• The 16°C band is the single highest-probability outcome at 36.5%, but ten other outcomes collectively hold 63.5% of implied probability.
• The 1-hour price change is flat at 0.0%, indicating no recent catalyst has moved trader conviction.
• The 24h price history shows the contract opened at $0.36 and is currently at $0.37, a minimal move consistent with early price discovery rather than informed directional flow.
• Liquidity at $28,282 far exceeds current volume, meaning the order book is set up for larger trades that have not yet arrived.
• The resolution window closes July 5 at 12:00 UTC, giving updated European weather model forecasts roughly 48 hours to reprice this market before close.

Lines Analysis: Paris Overnight Low and the Forecast Funnel

The 36.5% probability on 16°C reflects a reasonable meteorological prior for early July in Paris. The city’s July overnight lows historically cluster in the 15°C to 18°C range, and 16°C sits squarely in the middle of that distribution. Current European ensemble models for early July 2026 would be the single most important input here, and any trader with access to the latest ECMWF or Météo-France short-range forecast has a significant information edge over the broader market.

What makes NO structurally strong here is simple arithmetic. Even if 16°C is the most likely single outcome, a temperature landing at 15°C or 17°C, both adjacent and plausible, would pay out the NO contract. A cooler airmass pushing the low to 14°C or a warmer night keeping the minimum at 18°C or above would do the same. The NO contract wins across a wide corridor of outcomes, not just one extreme.

Signals to Monitor

• Météo-France and ECMWF 48-hour forecast for Paris overnight July 4-5: any model shift toward 17°C or 15°C minimums would reprice YES downward.
• Atlantic ridge or trough pattern over Western Europe: a ridge keeps nights warmer and pushes probability toward 17°C or 18°C bands.
• A cold front passage over northern France before July 5: would push probability toward 15°C or 14°C and away from the 16°C band.
• Updated ensemble spread in the 36-48 hour window: a tightening ensemble around 16°C would support the YES contract; a widening spread would pressure it lower.
• Any significant volume entering the adjacent 15°C or 17°C contracts on Polymarket: informed flow into neighboring bands signals trader confidence the minimum will miss 16°C.

The market has $1,358 in total volume. That is not a deep signal. The $28,282 in liquidity suggests market makers have positioned the order book for a more active trading period as the resolution date approaches. The data currently favors the 16°C outcome as a plurality, not a consensus. The next 48 hours of forecast updates will determine whether that plurality holds or collapses into a neighboring band.

LINES VERDICT

LEADING OUTCOME, FRAGILE PLURALITY

The 16°C band holds the highest single probability in this market, but that probability is thin and the order book is waiting for forecast data that hasn’t fully arrived yet.

What the market says: At 36.5% implied probability, the market rates 16°C as the most likely single outcome for the Paris overnight low on July 5, 2026, but the resolution date is two days away and this market has traded only $1,358 in total. Any updated European model run could shift prices quickly in a book this thin.

Key unknown: The 48-hour ECMWF and Météo-France ensemble forecasts for Paris overnight July 4-5 are the single most important data release that will reprice this contract before resolution.