Amsterdam July 5 High: Will It Hit Twenty-One Celsius?

Amsterdam’s weather on July 5 is one of the harder things to trade. The market has settled on 21°C as the most likely peak temperature, pricing it at a 55.5% implied probability. That is a narrow lead in a field with eleven possible outcomes, and the gap between 20°C and 22°C is essentially weather noise. Here’s what the measurements are telling us: July in Amsterdam averages a daily high near 22°C, but the variance around that mean is wide enough to make any single-day bet genuinely uncertain.

The market question asks which temperature bracket will represent the highest reading in Amsterdam on July 5, 2026, resolving at 12:00 UTC on that date. The YES price sits at 0.56 and NO at 0.45, with total volume of $1,899 and liquidity of $35,812. Those numbers matter: volume well below $1 million means this price can move sharply on a single updated forecast.

How the Amsterdam Temperature Contract Works

YES pays if Amsterdam’s July 5 peak temperature lands exactly in the 21°C bracket. NO pays if any other bracket claims the high. The Royal Netherlands Meteorological Institute (KNMI) and major weather services including the European Centre for Medium-Range Weather Forecasts (ECMWF) provide the underlying data. Resolution occurs at noon UTC on July 5, 2026.

• YES (21°C): 0.56 implied probability 55.5%
• NO (any other bracket): 0.45 implied probability 44.5%

The NO side wins when the peak temperature in Amsterdam falls outside the 21°C range on July 5. That means any reading in the 20°C bracket, the 22°C bracket, or further from center is enough. ECMWF ensemble models at this range typically carry uncertainty of plus or minus 2°C for a single-day European city forecast. That spread alone explains why eleven brackets share meaningful probability.

Momentum and Market Signals

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The momentum composite here is essentially flat. The 1-hour change is zero, the trend score sits at 50.51, and 24-hour change data is unavailable. This market has not moved on new information in the past hour. The most likely driver of any price shift before July 5 is a fresh ECMWF or GFS model run narrowing or widening the forecast cone for Amsterdam.

Total volume is $1,899, with all of that volume recorded in the last 24 hours. Liquidity stands at $35,812. The data doesn’t care about the politics, but thin volume does matter here: a single trader with a confident forecast and a few hundred dollars can move this price by several percentage points. Treat current pricing as a rough consensus, not a deep-market signal.

• The 1-hour and trend composite shows no directional conviction: price is holding steady at the 55.5% level without fresh catalyst.
• The 1-hour change of zero, combined with a neutral trend score, suggests traders are waiting on the next major model run before repositioning.
• Total volume of $1,899 flags this as a thin market: price movement on new data will be amplified relative to a deep-book market.
• Liquidity of $35,812 is healthy relative to volume, meaning the order book can absorb a moderate new position without extreme slippage.
• The 30-day price range shows this contract moved from 0.27 to 0.57, reflecting genuine uncertainty that resolved partially as July 5 approached.

Lines Analysis: Amsterdam July Fifth

The case for 21°C rests on climatology. Amsterdam’s July daily high distribution centers near 22°C, with 21°C and 22°C together accounting for a large share of historical July days. A modest trough or weakly anticyclonic pattern would push the day’s peak toward 21°C rather than higher. ECMWF forecasts for the Netherlands in early July 2026 have been consistent with a mild, slightly below-average temperature pattern, which favors the 21°C and 20°C brackets over 24°C or higher.

The risk to the 21°C position is real and symmetric. A stronger ridge building over Western Europe would push Amsterdam into the 23°C or 24°C range. A deeper Atlantic trough arriving early would cap the day at 19°C or 20°C. KNMI’s probabilistic temperature guidance for individual days carries substantial spread at two-day range. Either of those atmospheric setups would convert the current 55.5% holder into a losing position.

• ECMWF model runs updated July 3 and July 4 will be the primary price-moving catalysts before resolution.
• GFS model output diverging from ECMWF on the Western European ridge position would signal elevated uncertainty and could flatten the 21°C probability.
• Any KNMI official temperature forecast or airport METAR trend on the morning of July 5 will confirm or challenge the bracket.
• Atlantic low-pressure timing is the wildcard: an early arrival compresses the temperature window and shifts probability toward 20°C or below.
• Prolonged anticyclonic blocking over Scandinavia would heat Amsterdam above 23°C and make 21°C a losing ticket.

The total volume of $1,899 means the market is pricing a reasonable meteorological consensus, not a deep-book conviction. The data slightly favors the 21°C bracket, but the adjacent brackets at 20°C and 22°C carry enough residual probability that this is genuinely a close call. The market is pricing uncertainty, not science.

LINES VERDICT

LEAN YES, LOW CONVICTION

The 21°C bracket has the best single probability in an eleven-outcome field, supported by mild July climatology and current model guidance for Amsterdam. But at 55.5%, the market is essentially saying this is a coin flip with a modest tilt toward the center bracket.

What the market says: A 55.5% implied probability means the market assigns 21°C a slight edge over the field combined, but with all volume recorded in the last 24 hours and resolution in less than 48 hours, any model update before July 5 can reprice this contract sharply.

Key unknown: The July 4 ECMWF and GFS afternoon model runs are the single most important data inputs before resolution. If those models converge on a temperature above 22°C or below 20°C for Amsterdam on July 5, the 21°C bracket drops significantly in probability.