Warsaw June 17 High Temp: Will 21°C Hold?

Warsaw’s afternoon high on June 17 has already moved this market by 27 percent in 24 hours. Traders have landed on 21°C as the most likely peak, pricing it at 65.5 percent implied probability. The data doesn’t care about the politics, and right now the data is pointing squarely at the low twenties for central Poland today.

The market question is straightforward: will the highest temperature recorded in Warsaw on June 17 reach exactly 21°C? YES trades at 0.66 and NO at 0.35. The market closes at 12:00 UTC today, June 17, 2026. Total volume stands at $22,115, with $14,133 of that arriving in the last 24 hours.

How the 21°C Contract Works

Resolution hinges on the official highest temperature measurement for Warsaw on June 17. A YES payout requires Warsaw’s maximum temperature to register exactly 21°C for the day, as determined by the resolution source. Competing outcomes include 20°C, 22°C, 23°C, 24°C, 19°C, 25°C, 26°C, 27°C or higher, 18°C, and 17°C or below.

• YES (21°C): priced at 0.66, implying 65.5% probability
• NO (any other temperature): priced at 0.35, implying 34.5% probability

NO pays out if Warsaw’s official daily maximum lands on any outcome other than 21°C. Weather in central Poland this time of year can swing a degree or two based on cloud cover timing, wind shifts from the north, or an afternoon convective pulse. A reading of 20°C or 22°C would be enough to make YES traders whole on the wrong side of a coin.

Momentum and Market Signals

Sponsored Partner

The momentum composite here is striking. A 27 percent price jump in 24 hours, combined with a trend score of 65.14 and zero movement in the last hour, signals that the market has largely finished its repricing. The flat 1-hour change tells you traders have settled into a position and are now waiting for the thermometer to do the work.

Total volume of $22,115 is thin. The $14,133 in 24-hour volume shows most activity arrived in a compressed window, likely as morning weather data and forecast models updated. Liquidity sits at $51,749, which is healthy relative to volume. That said, with total volume well below $1 million, a single large trader moving into YES or NO could shift the price meaningfully before noon. Thin markets reprice fast on new information.

• The 27 percent 24-hour gain reflects revised meteorological forecast data pushing traders toward 21°C and away from lower outcomes.
• The flat 1-hour signal shows the market has absorbed available forecast information and is now in a holding pattern.
• Liquidity at $51,749 exceeds 24-hour volume, suggesting the order book can absorb modest new positions without major slippage.
• Volume below $1 million means this price is fragile. Any updated observational data from Warsaw weather stations before noon could reprice quickly.
• Trader sentiment reads strongly bullish at 65.5% YES versus 34.5% NO, consistent with the implied probability.

Lines Analysis: Warsaw and the Degree That Decides Everything

Here’s what the measurements are telling us: European forecast models have been converging on a mid-twenties ceiling for central Poland today, with 21°C representing the most densely traded single outcome. June in Warsaw historically sees mean daily highs in the 21 to 23°C range, making 21°C a plausible but not dominant outcome across a full distribution of days. The market is pricing uncertainty, not science. A one-degree band in a real-time weather event carries genuine variance, and 65.5% for a single Celsius outcome reflects that precisely.

What makes NO real is simple: Warsaw’s temperature settling at 20°C or 22°C would be just as meteorologically ordinary as 21°C. A persistent cloud deck through the afternoon could suppress the high to 20°C. A warm southwesterly pushing through earlier than forecast could push the reading to 22°C or 23°C. Neither scenario requires unusual conditions. The resolution window is tight, and the thermometer has no obligation to land on the market’s preferred digit.

• Updated Warsaw weather station observations before 12:00 UTC would reprice YES sharply in either direction.
• Satellite-derived surface temperature estimates for the Warsaw basin could signal a deviation from forecast models before official data arrives.
• European Centre for Medium-Range Weather Forecasts (ECMWF) or GFS model ensemble updates in the next few hours carry the most resolution risk.
• Convective activity over central Poland this morning would be the most likely mechanism for a cooler-than-forecast outcome.
• Clear sky persistence through late morning is the single condition most supportive of a YES resolution at 21°C.

Total volume of $22,115 represents a small but directionally clear market. The data favors YES, but a one-degree measurement event on a thin-volume contract is as close to a coin flip with a thumb on the scale as prediction markets get. The thumb is pointing at 21°C. The coin is still in the air.

LEANING YES, NARROW WINDOW

The market has done its repricing. Warsaw’s forecast profile and the volume surge into 21°C both point the same direction, but one-degree resolution events on sub-million-dollar markets are exactly where the data and the price can diverge fastest.

What the market says: At 65.5% implied probability, traders believe 21°C is the most likely single outcome for Warsaw today, but that still leaves more than one-in-three odds on every other temperature band combined. With resolution at noon, volatility risk is concentrated in the next few hours.

Key unknown: The single data point that would reprice this contract is any Warsaw observational reading or updated model output in the hours before the 12:00 UTC close showing the afternoon high trending toward 20°C or 22°C rather than 21°C.

Related Markets for Context

Warsaw’s June 17 temperature sits alongside a set of broader science and climate markets on Polymarket. Where 2026 ranks among the hottest years on record prices at 67%. Large volcano eruptions in 2026 price at 70%. These longer-horizon markets carry different risk profiles, but they share one feature with today’s contract: the measurement, not the narrative, determines the outcome.