Tokyo in late April experiences spring weather transitioning toward early summer, with typical highs ranging between 18 and 24 degrees Celsius depending on atmospheric patterns and seasonal shifts. A high of exactly 16°C on April 28 would represent cooler-than-average conditions for this time of year, suggesting possible cloud cover, wind patterns, or lingering cool air masses. This market is resolvable through Japan Meteorological Agency data, which records daily highs with precision. The current 0% odds indicate prediction market participants assess the probability of this specific temperature as effectively zero, reflecting either the latest weather forecasts showing warmer or cooler conditions, or the extremely narrow band required to hit 16°C precisely. The high specificity of the outcome—requiring the day's maximum to land exactly at 16°C rather than 15°C or 17°C—explains the minimal liquidity and zero conviction among traders. Historical April data for Tokyo shows most days land well above this threshold, though cool springs do occur. The market's pricing suggests traders view warmer or significantly cooler outcomes as far more likely than this narrow band.
Deep dive — what moves this market
Tokyo's climate in late April represents a transitional period between spring and early summer. The city typically experiences increasing warmth as May approaches, but late April can still bring variable weather patterns influenced by continental air masses and frontal systems moving across East Asia. Historical climate data shows that 16°C as a daily high is significantly below the normal range for late April in Tokyo, where average highs typically range between 18–24°C. The probability of hitting exactly 16°C reflects the intersection of multiple meteorological factors that would need to align precisely: sustained cloud cover reducing solar heating, strong wind patterns enhancing evaporative cooling, potential precipitation, and timing of any weather system passage during the peak heating hours. Factors favoring cooler conditions include the passage of a strong cold front from northern latitudes, unexpected cyclonic activity, or unusual polar air intrusion—events that do occur in April but remain statistically rare. Seasonal variability in East Asian weather patterns can occasionally deliver cooler-than-normal periods, though modern spring warming trends have made sub-18°C April highs increasingly uncommon in Tokyo's metropolitan area. Conversely, factors supporting warmer outcomes include the seasonal warming trend, high-pressure systems dominating the region, and clear-sky conditions typical of settled spring weather. Tokyo's urban heat island effect, driven by concentrated development and infrastructure, typically elevates daytime highs by 2–4°C relative to rural surroundings. Normal synoptic patterns in late April favor warm air advection from subtropical sources. The specificity of 16°C as a threshold is what creates the extreme difficulty: traders would more readily engage with a binary YES-above-18°C market, but the precise 16°C requirement eliminates most realistic outcomes. The market's 0% odds suggest traders have incorporated the latest numerical weather model guidance, which apparently shows either substantially warmer conditions or cooler extremes as more probable. The very low liquidity and minimal volume reflect minimal interest in this precise outcome. For prediction market participants to move odds meaningfully upward, a credible weather forecast showing a sharp cool-down with precision near 16°C would be required—an outcome few meteorological models explicitly highlight.
What traders watch for
Japan Meteorological Agency high-temperature forecast for April 28, released evening prior or morning-of, serves as primary direct data determining settlement outcome.
Cloud cover and precipitation patterns April 27–28 affecting solar heating and atmospheric conditions during peak daytime hours in Tokyo metropolitan area.
Cold front passage or northern air mass intrusion into central Honshu region—any significant weather system could alter temperature trajectory substantially.
Urban heat island dynamics and actual observed high at Tokyo's official weather station in Marunouchi district determining precise settlement temperature.
How does this market resolve?
The market resolves on April 28, 2026 based on the official daily high temperature recorded by Japan Meteorological Agency for Tokyo. It settles YES only if the maximum recorded temperature equals exactly 16°C; all other values resolve NO.
Prediction markets aggregate trader expectations into real-time probability estimates. On Polymarket Trade, every market question resolves YES or NO based on a specific event outcome; traders buy shares of the side they believe will resolve positively. Prices range 0¢ (certain no) to 100¢ (certain yes) and naturally reflect the crowd-implied probability of YES. This page summarizes the market state for readers arriving from search; for live trading (place orders, see order book depth, execute a trade) open the full interactive page linked above.
