Tokyo May 26 Low: Can 19°C Hit on a Spring Night?

Tokyo’s overnight temperature on May 26 is a one-number game. The Japan Meteorological Agency will record the daily minimum, and roughly 32% of market capital says that number lands at exactly 19°C. Late May in Tokyo sits in a transitional window: warm enough for muggy nights, cool enough for frontal passages to drag temperatures back toward the mid-teens. The data doesn’t care about the politics of weather forecasting. One degree of uncertainty is doing a lot of work here.

The market question asks for the lowest temperature recorded in Tokyo on May 26, 2026. The 19°C outcome is priced at $0.32, with the field of all other outcomes collectively at $0.68. The market closes at noon JST on May 26. Total volume stands at $6,421, with $5,476 traded in the last 24 hours.

How the Tokyo Low Contract Works

The Japan Meteorological Agency’s Tokyo observatory (Otemachi station) records the official daily minimum. Resolution depends on which specific temperature bin that reading falls into. Each outcome is a discrete bracket: 14°C or below, 15°C, 16°C, 17°C, 18°C, 19°C, 20°C, 21°C, 22°C, 23°C, or 24°C or higher.

• YES on 19°C pays out if the JMA records exactly 19°C as the Tokyo daily minimum on May 26.
• NO at $0.68 covers every other outcome: any reading above 19°C or below 19°C resolves the 19°C contract as zero.

For NO to pay out, the JMA minimum simply needs to land anywhere other than 19°C. Tokyo’s late-May temperature distribution spans roughly 14°C to 25°C depending on synoptic conditions. A strong maritime airmass pushes the minimum toward 22°C or higher. A passing cold front or clear-sky radiative cooling night pulls it toward 16°C to 17°C. The 19°C outcome occupies one narrow bin in a wide distribution. That structural reality explains the 68% implied probability assigned to all other outcomes combined.

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Market Signals and Short-Window Conviction

The trend score sits at 56.15, a modest lean toward 19°C without strong directional momentum. No 1-hour or 24-hour price changes are available, so the current price reflects accumulated positioning rather than a sharp recent move. Here’s what the measurements are telling us: most of the $6,421 in total volume moved in the last 24 hours, which means traders are actively repricing this contract as the resolution date closes in.

Liquidity is $21,248, which is healthy relative to total volume for a short-duration weather market. The volume itself is thin at under $10,000. That means a single moderately sized bet could shift the 19°C price meaningfully in either direction before noon JST on May 26. Treat any sharp price movement between now and resolution as a signal that new forecast data has entered the market, not necessarily that the physics of Tokyo’s atmosphere has changed.

• The 24-hour volume of $5,476 represents 85% of total market volume, confirming that trader interest is concentrated in the final hours before resolution.
• Liquidity of $21,248 provides reasonable depth for a sub-$10,000 volume market, reducing slippage risk on small-to-mid-size positions.
• The trend score of 56.15 signals mild conviction toward 19°C without confirming a strong directional move.
• Thin total volume below $1,000 thresholds does not apply here, but the sub-$10,000 level still warrants caution: price can shift sharply on new JMA forecast data.
• No whale trades have been recorded, so current pricing reflects retail-sized positioning across multiple traders.

Lines Analysis: The Case for 19°C and What Breaks It

Late May Tokyo climatology centers overnight lows in the 17°C to 21°C range, with 19°C representing roughly the median of current-season expectations. If synoptic conditions on the evening of May 25 into May 26 feature moderate cloud cover, light southerly winds off Tokyo Bay, and no frontal activity, a 19°C reading is well within the JMA’s likely range. The market is pricing uncertainty, not science: 32% for one specific degree in a five-degree probability window is actually a reasonable implied probability for a single-bin weather outcome.

The counterargument lives in the tails. A surface high pressure system over central Honshu on the evening of May 25 would drive radiative cooling, pushing the minimum toward 16°C to 17°C. Conversely, a warm moist flow from the southwest ahead of an approaching front could hold overnight temperatures near 22°C to 23°C. Both scenarios resolve the 19°C contract at zero. The JMA’s short-range forecast for the May 25 to 26 overnight period is the single most important input this contract has left.

• JMA short-range forecast update for Tokyo on May 25 evening: any shift toward clear skies or increasing southerly winds directly reprices this contract.
• Surface pressure analysis for Honshu: a strengthening high favors radiative cooling and lower minimums; an approaching trough favors warmer minimums.
• Tokyo Bay sea surface temperature: currently in the 18°C to 20°C range for late May, providing a thermal floor for overnight minimums near the coast.
• Synoptic pattern over the Korean Peninsula and East China Sea: upstream conditions on May 24 to 25 will determine whether warm or cold advection dominates the overnight hours.

Total volume of $6,421 is thin enough that this market reflects informed weather traders rather than broad market consensus. The data leans toward 19°C as a plausible central outcome, but a one-in-three implied probability is appropriate for a single-degree bin. Neither side of this market has a structural edge until the final JMA forecast is in.

LINES VERDICT

Narrow Bin, Reasonable Price

The 19°C outcome is priced fairly for a single-degree weather bin in a volatile late-May synoptic window. The JMA overnight low forecast for May 25 into May 26 is the only input that matters from here.

What the market says: A 32% implied probability reflects reasonable uncertainty for one specific temperature in a five-to-seven degree possible range. With resolution in under 24 hours, this price will move sharply the moment new JMA forecast data arrives.

Key unknown: The Japan Meteorological Agency’s evening forecast update for Tokyo on May 25 is the single data point that will reprice this contract. A clear-sky, light-wind overnight scenario shifts probability toward lower bins. A warm southerly flow scenario shifts probability toward 20°C or higher.

Scientific Context: Tokyo Late-May Temperature Climatology

Tokyo’s Otemachi station records show late-May overnight minimums clustering between 16°C and 22°C in recent years, with the median around 18°C to 19°C. Urban heat island effects keep Tokyo’s minimums consistently above surrounding suburban areas, which provides a warm bias relative to broader Kanto plain temperatures. Frontal systems moving through the Kuroshio Current region are the primary source of overnight temperature variability in this period. The JMA issues updated three-hourly surface analyses and short-range forecasts, which are the most reliable resolution predictors for this contract.

What would move this contract before May 26 noon JST: A JMA forecast showing overnight lows in the 18°C to 20°C range would compress probability across multiple adjacent bins, holding 19°C near current pricing. Any forecast showing a strong temperature departure in either direction would sharply deflate the 19°C bin and inflate the winning bin. Traders watching this market should monitor the JMA’s evening surface analysis and the Tokyo point forecast issued around 17:00 JST on May 25.

Is this a nineteen-degrees question or a weather forecast question? p>This is a five-question FAQ for the Tokyo May 26 Low contract.

What does a 32% probability mean for the 19°C outcome?

The market assigns roughly a one-in-three chance that the JMA records exactly 19°C as Tokyo’s daily minimum on May 26. That probability must be shared across all other outcomes.

What happens if the low is 20°C or 18°C?

Any temperature other than exactly 19°C resolves the 19°C contract at zero. Traders holding 19°C receive nothing if the JMA records 18°C, 20°C, or any other value.

What data event would move this price most sharply?

The JMA’s evening forecast update for Tokyo on May 25, particularly the overnight low prediction, is the primary catalyst. A tight forecast range centered on 19°C would increase implied probability; a forecast pointing toward 17°C or 21°C would deflate it.

When does this market resolve?

Resolution closes at noon JST on May 26, 2026, after the JMA has recorded the overnight minimum. The resolution source is the official JMA daily temperature record for Tokyo.

Is the volume reliable enough to trust this price?

Total volume is $6,421 with $21,248 in liquidity. Volume is thin, meaning a single moderately sized trade could shift the price. Treat current pricing as directional guidance, not a precise probability estimate.