Warsaw May 16 High Temperature: Will It Hit Thirteen Degrees?

Warsaw’s weather market is drawing real attention heading into May 16. Traders are split almost exactly down the middle on whether the Polish capital’s daily high will reach 13°C tomorrow. The contract has surged sharply in the last 24 hours, with the implied probability climbing from the high 20s to 43%. That kind of move on a one-day weather market is worth unpacking.

This market resolves at 2026-05-16 12:00:00, using the highest recorded temperature in Warsaw on that date. At 43%, traders are saying the outcome is real but not favored. The 57% lean against is a thin margin. A single degree of warming or a shift in wind direction could swing this contract before resolution.

How the Warsaw Temperature Contract Works

This contract resolves YES if Warsaw’s highest temperature on May 16, 2026 reaches exactly 13°C. Resolution uses official meteorological measurement for the date. The contract closes at 2026-05-16 12:00:00.

• YES (13°C hits): priced at 0.43, implying a 43% probability.
• NO (13°C does not register as the daily high): priced at 0.57, implying a 57% probability.

For NO to pay out, Warsaw’s high temperature on May 16 must land at any value other than 13°C. That could mean cooler conditions — 12°C or below — or a warmer outcome at 14°C, 15°C, or higher. The competing outcome contracts on this same event span a wide range, from 12°C or below all the way to 22°C or higher. The spread of options reflects genuine forecast uncertainty for a mid-May day in central Poland, where temperatures can vary sharply depending on whether Atlantic or continental air dominates.

Momentum and Market Signals

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Momentum Is Running Hot on a Cold-Weather Contract

The momentum composite here is unusually sharp for a single-day weather market. The 1-hour and 24-hour price changes are both tracking at +14.0%, and the trend score sits at 64.97. That combination reads as a decisive recent shift in trader positioning, likely driven by updated European forecast model runs published in the last 12 to 24 hours. Forecasters regularly revise short-range temperature outlooks as model ensembles converge closer to the event date.

Total volume on this market is $20,279, with $13,539 of that moving in the last 24 hours. Liquidity stands at $37,085. With total volume well under $1 million, this is a thin market. A modest-sized position can move the price meaningfully. That partly explains the +14.0% swing. A handful of traders repricing based on fresh forecast data can look like consensus when the order book is this shallow.

• 1h and 24h price change both at +14.0%: the move is sustained, not a momentary spike, suggesting traders are responding to consistent forecast signals rather than noise.
• Trend score of 64.97: above the midpoint, confirming the directional lean toward YES has strengthened since yesterday.
• $13,539 in 24h volume against $37,085 liquidity: more than one-third of total liquidity changed hands today, which is high turnover for a weather contract this close to resolution.
• Thin order book at this volume level: any significant new forecast revision — colder or warmer — could push the price 10 to 15 percentage points before resolution.
• 57% NO lean persists despite the rally: the majority of capital still sits against 13°C as the exact daily high.

Lines Analysis: What the Forecast Tells the Market

Mid-May Warsaw temperatures typically range between 12°C and 18°C, with the long-run average daily high around 17°C for the second half of the month. A forecast of exactly 13°C would represent a cooler-than-average day, consistent with a northerly or north-westerly flow bringing cooler maritime air across Poland. European Centre for Medium-Range Weather Forecasts (ECMWF) ensemble runs for this period have shown meaningful spread in surface temperature forecasts for central Poland, which is what makes a market like this function at all. If the ensemble were tightly clustered around one value, this contract would price closer to 90% or 10%.

The risk to the YES outcome is straightforward. Warsaw hitting exactly 13°C requires the forecast to verify at a precise value, not a range. Even if the day is cool, a high of 14°C or 12°C means YES loses. That precision requirement is the core structural challenge for anyone holding YES here. Temperature forecasts for individual stations 24 hours out carry a typical error range of plus or minus 2°C in European mid-latitude settings. Hitting the exact degree is a narrower target than predicting a broad temperature band.

Signals to monitor before 2026-05-16 12:00:00:

• ECMWF and GFS model agreement on Warsaw surface temperature: if both converge below 13°C overnight, NO gains ground fast.
• Synoptic pattern for Poland on May 16: a low-pressure system tracking across the Baltic would keep temperatures suppressed and raise the probability of a sub-13°C high.
• Any warm sector intrusion from the south or south-west: this would push the daily high toward 15°C to 17°C, collapsing the YES probability rapidly.
• Morning observation from Warsaw Okecie or Chopin Airport weather station: first-light temperature data would indicate whether the day is tracking toward or away from 13°C.
• Competing outcome contracts repricing: a sudden rally in the 14°C or 15°C contracts would signal traders are shifting the most likely outcome upward, which is bearish for this contract.

At $20,279 in total volume and a 43% probability, this contract reflects genuine uncertainty around a specific meteorological outcome less than 24 hours from resolution. The momentum says traders have recently grown more confident in 13°C, but the majority of capital still sits on the other side. The data will resolve this cleanly tomorrow.

LINES VERDICT

UNCERTAIN — WATCH THE OVERNIGHT FORECAST

The contract is trading at a discount to even odds, and the structural challenge of hitting an exact temperature degree keeps the probability below 50%. The recent momentum is real, but thin liquidity means it reflects a small number of informed traders, not broad market consensus.

What the market says: At 43%, traders believe a 13°C high in Warsaw on May 16 is a real but minority outcome. Thin volume means this price is sensitive to any shift in the overnight forecast model runs before resolution at 2026-05-16 12:00:00.

Key unknown: The ECMWF midnight model run for May 16 is the single most important data point before resolution. If that run shifts the Warsaw surface temperature forecast by even one degree, this contract reprices fast.

Scientific Context

Warsaw sits in a continental-influenced climate zone where May temperatures can swing significantly based on synoptic-scale weather patterns. Mean daily highs in mid-May average between 16°C and 18°C based on historical climatology. A 13°C high would represent a noticeably cool day, roughly 4 to 5 degrees below the seasonal mean. That scenario is plausible — cold outbreaks in May are not unusual in Poland — but it is the tail of the distribution, not the center. The market is pricing uncertainty, not science, and at 43% it is accurately reflecting that this is a below-average temperature outcome that requires a specific weather pattern to verify.

FAQ

What does 43% probability mean for this contract? It means traders currently believe there is roughly a 43-in-100 chance that Warsaw’s highest temperature on May 16 is exactly 13°C. The remaining 57% is distributed across the other temperature outcomes on this market.

How does the NO contract pay out? Any daily high in Warsaw on May 16 other than 13°C — whether cooler at 12°C or warmer at 14°C or above — results in the NO contract paying out at full value.

What data release would move this price before resolution? Updated ECMWF or GFS model runs published overnight, particularly any shift in the 850 hPa temperature forecast for central Poland, would be the most direct trigger for a price move.

When does this market resolve? Resolution is set for 2026-05-16 12:00:00, using the official highest temperature recorded in Warsaw on that date.

Is the volume reliable for reading price signals? Total volume is $20,279, well under $1 million. This is a thin market. Price moves can reflect one or two large trades rather than broad consensus, so treat the current 43% probability as directional guidance, not a precise forecast signal.