Tokyo April 26 Low Temp: Will Thirteen Degrees Hold?

The prediction market for Tokyo’s lowest temperature on April 26 moved fast. The 13°C outcome climbed from 0.22 to 0.66 in a single trading session, a swing of more than 40% in 24 hours. That kind of momentum in a weather market this close to resolution means traders have found a signal, probably from a short-range forecast model update, and are pricing it hard.

The contract resolves at 2026-04-26 12:00:00, less than 21 hours from now. At 65.5% implied probability, the market is saying 13°C is the most likely single outcome among eleven discrete options. That is a meaningful lead in a field this fragmented, but it is not a consensus. One good forecast revision could reprice this contract completely before midnight Tokyo time.

How the Tokyo Temperature Contract Works

This market asks traders to pick the exact lowest temperature recorded in Tokyo on April 26. The winning outcome is the single Celsius value that matches the official low. Eleven outcomes are available: 8°C or below, 9°C, 10°C, 11°C, 12°C, 13°C, 14°C, 15°C, 16°C, 17°C, and 18°C or higher.

• 13°C (YES): priced at 0.66, implying 65.5% probability of resolution at this exact value.
• All other outcomes (the effective NO field): priced collectively at 0.35, implying 34.5% probability that Tokyo’s low lands anywhere else.

The 34.5% on the field is meaningful. Tokyo’s late April temperatures cluster in a range of roughly 10°C to 16°C. If forecast models shift toward 12°C or 14°C in the next model run, liquidity in those adjacent contracts would absorb money fast. The 13°C contract does not pay out if the official low comes in at 12.5°C rounded down, or 13.4°C rounded to 13. Resolution depends entirely on the reported integer value from the designated weather source.

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Momentum and Market Signals

The 24-hour price change of +40.5%, the 1-hour change of +24.0%, and the trend score of 84.74 are one composite signal: a large, fast, directional bet that 13°C is the right answer. The most likely driver is a model update from a major numerical weather prediction system, probably Japan Meteorological Agency’s short-range ensemble or a global model run showing the 850 hPa temperature advection pattern locking in for April 26.

Total volume is $16,310, with $15,024 of that arriving in the last 24 hours. Liquidity stands at $301,766. Volume below $1 million means this market can move sharply on a single large trade or a forecast revision. The liquidity figure is deep relative to volume, which suggests market makers have positioned around a range of outcomes, but the trading action has concentrated on 13°C hard.

• The 1-hour price change of +24.0% indicates buying pressure is still active as of the 2026-04-25 15:12:43 timestamp.
• The 24-hour change of +40.5% is unusually large for a single-day temperature contract this close to resolution.
• Trend score of 84.74 out of 100 signals strong directional conviction, not a balanced market.
• $15,024 of the $16,310 total volume arrived in the last 24 hours, meaning this market was illiquid before the forecast signal hit.
• Open interest is $0, which is consistent with a binary-style discrete market where positions are not tracked the same way as perpetual contracts.

Lines Analysis: Tokyo Low on April 26

Japan Meteorological Agency’s short-range forecasts for the Kanto region in late April typically carry high skill within a 24-hour window. If the agency’s guidance has Tokyo’s minimum temperature for April 26 centered on 13°C, the market price makes direct sense. April 26 falls in a transition period where synoptic patterns can bring either residual cold air from the north or early maritime warmth from the Pacific. A 13°C low is consistent with a neutral to slightly below-normal pattern for late April in Tokyo, where the 30-year climatological average minimum for late April sits near 12°C to 14°C.

The real risk to the 13°C outcome is precision. Tokyo’s official minimum temperature is reported to the nearest tenth, then rounded or truncated to an integer for discrete markets. A low of 13.5°C or 12.6°C could resolve as 14°C or 12°C depending on rounding convention. Traders buying 13°C at 0.66 are betting not just on the forecast range but on the integer outcome specifically. Adjacent outcomes at 12°C and 14°C remain live risks, and the 34.5% collective field probability reflects exactly that precision uncertainty.

• Japan Meteorological Agency publishes official temperature data for Tokyo (Otemachi observation point) shortly after local midnight, which is the primary resolution trigger.
• A shift in the Pacific high pressure ridge overnight could push the low warmer, toward 14°C or 15°C, and reprice the adjacent contracts sharply.
• An unexpected cold air intrusion from the Sea of Japan side could push the low toward 12°C or below, deflating the 13°C position.
• Model ensemble spread for 24-hour forecasts in Japan typically narrows to plus or minus 1°C to 2°C at this range, meaning 12°C, 13°C, and 14°C all remain plausible.
• The final JMA observation update before resolution is the single most important data point remaining.

At $16,310 total volume, this is a thin market by prediction market standards. The 65.5% price reflects concentrated conviction from a small number of traders reading the same forecast signal. That is meaningful directional information, but it is not the product of broad market consensus. The data favors 13°C at this hour, but the precision risk is real and the resolution window is tight.

LINES VERDICT

Thirteen Degrees, Fragile Lead

The forecast signal is clear enough that traders moved fast and hard into 13°C, but single-integer temperature markets this close to resolution live and die on rounding and late model revisions. The data supports the leading outcome, but precision uncertainty keeps the field alive.

What the market says: 65.5% probability that Tokyo’s April 26 low resolves at exactly 13°C, with the resolution deadline of 2026-04-26 12:00:00 less than 21 hours away. Thin volume means one large trade or a forecast shift could move this price by 15 to 20 points before close.

Key unknown: The final Japan Meteorological Agency short-range ensemble update for the Kanto region overnight on April 25 to 26 is the single data point that would reprice every outcome in this contract. If that model run shifts the temperature center of mass by even one degree, the adjacent 12°C and 14°C contracts become immediate challengers.

Scientific Context and Historical Patterns

Tokyo’s late April climatology is well-documented. The Otemachi observation station, which serves as the official reference point for Tokyo temperature records, typically records April 26 lows in the 10°C to 15°C range depending on synoptic conditions. Years with dominant Pacific high pressure see warmer nights. Years with persistent upper-level troughs over the Japanese archipelago see cooler nights with readings closer to 10°C to 12°C. A 13°C low is near the climatological center for this date, which is exactly why the market converged there. It is the default outcome when the forecast is neutral.

Before 2026-04-26 12:00:00, the events that matter are the JMA 24-hour model run publishing overnight Tokyo time, any surface observation data from the Kanto region showing temperature trend in real time, and whether the 850 hPa level wind pattern holds the mild maritime flow that would anchor a 13°C minimum. If any of those signals shift, this market will reprice within minutes.

Frequently Asked Questions

• What does 65.5% probability mean here? It means the market’s collective money says there is roughly a two-in-three chance Tokyo’s official low on April 26 rounds to exactly 13°C. It is not a meteorological agency forecast. It is trader consensus based on available forecast data as of April 25.
• How does the field of other outcomes work? Every outcome that is not 13°C effectively forms the opposing side. If Tokyo’s low comes in at 12°C, 14°C, or any other integer, the 13°C contract pays zero. The 34.5% field probability covers all those alternatives combined.
• What data release moves this market the most? The Japan Meteorological Agency’s short-range ensemble forecast for the Kanto region, updated overnight on April 25 to 26, is the single most important data input. Official real-time surface observations from Otemachi would also move prices immediately.
• When does this contract resolve? Resolution is set for 2026-04-26 12:00:00. That corresponds to late morning Japan Standard Time on April 26, after the official overnight low has been recorded and published.
• Is $16,310 in total volume enough to trust this price? Total volume below $1 million means the price reflects a small number of traders. The 65.5% probability is directionally informative but not deeply crowd-sourced. A single large trade in the final hours could shift the price significantly.

This analysis reflects market conditions as of 2026-04-25 15:12:43. Prediction market probabilities are volatile and shift as new data and regulatory decisions emerge, especially as the 2026-04-26 12:00:00 resolution date approaches. Lines.com does not accept bets or provide financial or gambling advice. All market outcomes are uncertain.