Warsaw July 5 High Temperature: Can 21°C Hold at 33%?

Warsaw’s weather on July 5 has become a micro-prediction market with a surprisingly active order book. The market is pricing 21°C as the most likely daily high, sitting at 33% implied probability with just two days until resolution. That number is interesting because it reflects genuine meteorological uncertainty across a tight temperature band, not a lopsided call. Here’s what the measurements are telling us: mid-July temperatures in Warsaw cluster in a range where a few degrees of forecast error completely reshuffles the outcome distribution.

The market question asks for the highest temperature recorded in Warsaw on July 5, resolving at noon local time on that date. The YES price on 21°C sits at 0.33, with NO at 0.67. Total volume is $4,736, with 24-hour volume of $4,761 suggesting nearly all trading is concentrated in the final 48 hours. The market resolves on July 5, 2026.

How the 21°C Contract Works

YES pays out if Warsaw’s official daily maximum temperature on July 5 lands precisely at 21°C. NO covers every other outcome: a cooler day at 20°C or below, or a warmer one at 22°C or higher. The spread across eleven possible outcomes means no single bin commands a dominant probability. That fragmentation is exactly why 33% for 21°C can still represent the single highest-probability outcome on the board.

• YES (21°C): 0.33 — market assigns roughly one-in-three odds that Warsaw peaks exactly at 21°C on July 5.
• NO (all other outcomes): 0.67 — the two-thirds probability covers ten alternative temperature bins, from 14°C or below to 24°C or higher.

For NO to pay, Warsaw simply needs to record any maximum temperature other than 21°C. Given that European weather forecasts carry a standard error of plus or minus two to three degrees at the 48-hour horizon, the NO position is structurally broad. A warmer surge from a high-pressure system, or a cloudy afternoon suppressing the peak, each independently delivers a NO outcome. The market is pricing uncertainty, not science, and the uncertainty here is real.

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Momentum and Market Signals

The momentum composite tells a clear story. The 1-hour price change of +1.0% combined with a trend score of 40.21 points to mild bullish drift on the 21°C outcome, most likely driven by short-range forecast models updating toward a mild July 5 scenario in central Poland. The 24-hour change is unavailable, but the price-at-open data shows a 6.5% move on July 3, suggesting a meaningful forecast revision triggered fresh positioning.

Total volume of $4,736 and liquidity of $52,649 tell two different stories. Liquidity is robust for a market this size, meaning the order book can absorb new trades without wild price swings. But total volume below $5,000 means this market is thin. A single large bet could move the 21°C price by several percentage points. Treat current pricing as directionally informative, not deeply calibrated.

• The 1-hour momentum of +1.0% with a trend score of 40.21 signals mild positive drift toward 21°C, consistent with a forecast model nudging the July 5 high slightly warmer.
• The 6.5% price move on July 3 was the single largest price event in this market’s history, triggered by updated numerical weather prediction output.
• Total volume below $5,000 means thin liquidity, and any new forecast revision in the next 36 hours could shift prices sharply.
• Trader sentiment breaks down as strongly bearish: 33% YES versus 67% NO, meaning the majority of capital is positioned against 21°C specifically.
• The 24-hour volume of $4,761 essentially equals total volume, confirming this market activated very recently and is entirely driven by near-term forecast data.

Lines Analysis: Warsaw’s July Temperature Band

What supports 21°C? Central Poland in early July sits in a transitional meteorological zone. The long-run average daily maximum for Warsaw in early July runs between 22°C and 24°C, but a weak Atlantic low-pressure system or increased cloud cover can suppress peaks into the 19-21°C range. If current European Centre for Medium-Range Weather Forecasts (ECMWF) ensemble output is pointing toward a mild, partly cloudy July 5 in Warsaw, then 21°C becomes the modal outcome across the distribution. The +1.0% hourly drift suggests that is roughly where the models are landing right now.

What makes NO compelling? The temperature band from 19°C to 23°C covers a wide swath of plausible outcomes. Even if 21°C is the single most likely outcome at 33%, that still means 67% probability is distributed across ten other bins. A warmer afternoon, driven by high pressure building from the south or east, could push the peak to 22°C or 23°C. A persistent overcast with rain would suppress the high to 19°C or 20°C. Any directional forecast error collapses the 21°C bet entirely.

• ECMWF and GFS ensemble updates over the next 36 hours will be the primary price driver. A tighter forecast cone around 21°C would push YES toward 40% or higher.
• Precipitation forecasts for Warsaw on July 5 matter as much as temperature. Afternoon rain suppresses the daily maximum and shifts probability mass toward cooler bins.
• High-pressure ridging from central Europe would push the peak warmer, toward 22-24°C, and directly erode the 21°C YES position.
• The market resolves at noon local time, not end of day. Morning maximum temperatures would need to reach 21°C by that cutoff, which adds another layer of timing uncertainty.
• Synoptic pattern analysis from Poland’s Institute of Meteorology and Water Management (IMGW) would be the most authoritative near-term data point to watch.

Total volume of $4,736 reflects a very new, very thin market. The data currently favors 21°C as the modal outcome, but the probability distribution is genuinely flat across neighboring bins. The NO side carries more capital by count, but that reflects the mathematics of a fragmented multi-outcome market, not a strong directional meteorological signal. The single most important input before resolution is the 48-hour ensemble forecast update, expected in the next 12 to 24 hours.

LINES VERDICT

MODAL BUT UNCERTAIN

21°C is the single most likely outcome in a fragmented eleven-way market, but 33% is a modest plurality, not a dominant call. The forecast data is driving price, not trader conviction.

What the market says: At 33% implied probability, the market treats 21°C as the best single guess but assigns two-thirds of its probability to something else happening. With resolution in less than 48 hours, any forecast model update before July 5 could reprice this contract sharply in either direction.

Key unknown: The next ECMWF or GFS ensemble run covering Warsaw on July 5 is the single data point that moves this market. A tighter forecast around 21°C pushes YES higher. A shift toward 22°C or above collapses it.