Amsterdam May 28 High: Will It Hit Twenty-Five?

Amsterdam’s weather market is moving fast. The contract for a 25°C high on May 28 jumped more than 21 percent in the last 24 hours, landing at 54.5% implied probability. That kind of momentum in a short-duration weather market means one thing: forecast models are converging, and traders are following the data in real time.

The market question asks for the single highest temperature recorded in Amsterdam on May 28, 2026. The current leader is 25°C, priced at $0.55 YES and $0.46 NO. The contract resolves at noon UTC on May 28. Total volume has reached $14,663, with $11,804 traded in the last 24 hours alone.

How the Amsterdam May 28 Temperature Contract Works

This market resolves to YES for 25°C if the official daily maximum temperature in Amsterdam on May 28 hits that exact degree. Competing outcomes include 24°C, 26°C, 23°C, 27°C, 22°C, 28°C or higher, and a range down to 18°C or below. Resolution uses official meteorological observation data. Each degree bracket is a separate contract, and only one pays out.

• YES at $0.55 pays out if Amsterdam’s official May 28 high lands at exactly 25°C (54.5% implied probability).
• NO at $0.46 covers every other outcome, from a cool 18°C or below to a hot 28°C or higher (45.5% implied probability).

The NO case is straightforward but wide. Amsterdam’s May high temperature has to land anywhere except exactly 25°C for the alternative outcomes to pay. A slightly stronger warm front pushes the reading to 26°C or 27°C. A cloud-covered morning with a slower warm-up lands at 24°C or below. European mesoscale forecast models show tight spread for tomorrow, but a single-degree resolution market like this one lives and dies on that final reading.

Momentum and Market Signals

Sponsored Partner

The combined momentum signal here is strong and directional. The 1-hour change is flat at 0.0%, but the 24-hour surge of 21.5% with a trend score of 57.70 points to a decisive shift in forecast model output sometime in the past day. When a short-duration weather market moves that sharply, it is almost always a sync with a deterministic model run, specifically the ECMWF or GFS 48-hour surface temperature output showing 25°C as the modal outcome for Amsterdam tomorrow.

Total volume sits at $14,663 with $11,804 arriving in the last 24 hours. Liquidity is $29,306, which is healthy for a single-day weather market. Volume below $1M means price can move sharply on a new forecast model run, and this market is well below that threshold. One confident trader or a fresh model update could reprice this contract by several percentage points before resolution.

• The 24-hour price change of +21.5% aligns with a probable ECMWF or GFS model update converging on 25°C as the Amsterdam daily maximum for May 28.
• The 1-hour flatness at 0.0% suggests the initial model-driven repricing has stabilized, with traders now waiting for the next forecast cycle.
• Liquidity of $29,306 against a $14,663 total volume base means the order book is reasonably deep for a micro-duration market.
• Thin overall volume means a single large trade can move the contract by five to ten percentage points before noon UTC tomorrow.
• The trend score of 57.70 confirms directional lean toward YES without signaling overwhelming consensus.

Lines Analysis: Amsterdam Temperature on May Twenty-Eight

Here’s what the measurements are telling us. European regional forecasts for Amsterdam on May 28 are pointing toward a warm spring day, with the 25°C bracket attracting the majority of market capital after a sharp 24-hour reprice. Late May in Amsterdam has a climatological daily maximum around 17°C to 19°C, so a reading at 25°C would represent a meaningful warm anomaly. That kind of warmth is entirely plausible under a southerly flow pattern, which is what current synoptic setups across Western Europe are suggesting for late May 2026.

What makes the alternative outcomes real is the precision required for this contract. Amsterdam’s May 28 high landing at exactly 25°C requires the warmest part of the afternoon to stay within a tight one-degree window. A stronger ridge or more direct southerly advection pushes the reading to 26°C or 27°C. Morning cloud cover or a sea breeze off the North Sea could cap the afternoon at 24°C. The 26°C and 24°C contracts are the most likely competitors. Neither has attracted the volume that 25°C has, but both represent plausible model outcomes given forecast uncertainty at the 48-hour range.

• KNMI (the Royal Netherlands Meteorological Institute) publishes official surface temperature observations for Amsterdam. Any update to their forecast or advisory would directly reprice this contract.
• The next ECMWF model run (00Z or 12Z UTC) covering May 28 is the single most important data input before resolution.
• GFS ensemble spread for Amsterdam on May 28 will show whether the 25°C signal is consistent across ensemble members or driven by a single deterministic run.
• Afternoon sea breeze development is the key local factor. North Sea influence can suppress Amsterdam’s afternoon high by one to two degrees on otherwise warm days.
• Any shift in the 500 hPa ridge axis over Western Europe would affect how far inland warm southerly air penetrates before resolution at noon UTC.

The data doesn’t care about the politics, and this market is a pure weather forecast question. Total volume of $14,663 is modest. The 24-hour surge favors 25°C, but the precision required for this single-degree bracket keeps the probability well below certainty. The next forecast model cycle is the deciding input.

LINES VERDICT

SLIGHT EDGE TO TWENTY-FIVE DEGREES

The 24-hour repricing reflects genuine forecast model convergence on 25°C as the modal Amsterdam high for May 28. The market is pricing uncertainty, not science, and a one-degree bracket always carries meaningful miss risk.

What the market says: 54.5% implied probability means traders see 25°C as the most likely single outcome, but barely more likely than not. Thin volume means one model update before noon UTC could reprice this contract sharply before resolution on May 28.

Key unknown: The next ECMWF or GFS 12Z model run covering May 28 Amsterdam surface temperatures is the single data point that would move this contract materially before resolution.

Scientific and Forecast Context

Amsterdam’s late-May climatological average daily maximum sits between 17°C and 19°C based on historical KNMI records. A 25°C reading on May 28 would fall roughly six to eight degrees above the long-run average for that date. Warm anomalies of this magnitude in late May are increasingly observed under persistent anticyclonic conditions over Western Europe. They are not extreme by recent standards, but they require a specific synoptic setup to materialize and hold through the afternoon hours before the sea breeze develops.

The precision of a single-degree resolution market amplifies forecast uncertainty in ways that broader temperature-range markets do not. Even if the forecast strongly favors a warm day, the difference between 24°C, 25°C, and 26°C often falls within the margin of model uncertainty at 48 hours. Traders in this contract are essentially pricing the probability density function of tomorrow’s Amsterdam maximum at a single one-degree bin. That is a narrow target, which is why 54.5% is a reasonable ceiling for the leading outcome even with strong directional model support.

Events that would move price before the May 28 noon UTC resolution: a new ECMWF deterministic run shifting the Amsterdam maximum to 26°C or 24°C, a KNMI special weather advisory signaling unusual temperature behavior, or any observed morning temperature readings from Amsterdam stations that suggest the day is tracking above or below the 25°C modal forecast.

Is Amsterdam May 28 temperature hitting exactly twenty-five degrees?

The market assigns 54.5% probability. That means traders see it as the single most likely outcome among eleven brackets, but not a near-certain result.

What does the NO contract cover?

Every outcome except exactly 25°C pays NO, including 24°C, 26°C, and all other brackets. A miss of even one degree in either direction pays out the alternative contracts.

What data point would move this contract most?

The next ECMWF or GFS 12Z model run for May 28 Amsterdam surface temperatures is the primary catalyst. Any shift in the modal forecast to 24°C or 26°C would reprice this contract immediately.

When does this contract resolve?

Resolution occurs at noon UTC on May 28, 2026, using official meteorological observation data for Amsterdam’s daily maximum temperature.

Is the volume reliable enough to trust this price?

Total volume is $14,663 with $29,306 in liquidity. Below $1M total volume means a single large trade can move the price by five to ten percentage points. The signal is directional but not deep.