Tokyo June 10 Low Temp: 19°C Leads at 36.5%

Tokyo’s overnight low on June 10 has become one of the more contested short-window weather markets on Polymarket. The 19°C outcome sits at 36.5% implied probability, but the market moved hard in the last 24 hours. A 25.3% price surge in a single day tells you traders found new conviction, not that the outcome is settled.

The market question asks: what will be the lowest temperature recorded in Tokyo on June 10? The 19°C outcome trades at 0.37 YES and 0.64 NO. The market closes June 10 at 12:00 UTC. Total volume stands at $9,511, with $7,460 of that trading in the last 24 hours alone.

How the Tokyo June 10 Low Temperature Contract Works

This contract resolves on a single observation: the lowest temperature recorded in Tokyo on June 10, 2026. YES pays if the official minimum hits exactly 19°C. Any reading above or below that specific value sends the payout to a competing outcome. Japan Meteorological Agency data at the Otemachi observation station in central Tokyo is the standard reference for this type of resolution.

• YES (19°C) trades at 0.37, implying a 36.5% probability the overnight low lands on exactly this value.
• NO (all other outcomes) trades at 0.64, implying a 63.5% probability the low lands somewhere else, whether 18°C, 20°C, or any adjacent bucket.

The NO side pays out across a wide range of competing outcomes. Tokyo’s overnight low on June 10 misses this bucket if a marine air mass pushes temperatures 1 degree warmer into the 20°C range, or if a clearing sky allows radiative cooling to pull the minimum down to 18°C. The spread of competing outcomes (13°C or below through 23°C or higher) means the NO pool is broad, which dilutes any single alternative outcome but collectively keeps YES as the plurality leader rather than a dominant favorite.

Sponsored Partner

Momentum and Market Signals

The momentum composite here is striking. A 25.3% price jump in 24 hours, a trend score of 59.71, and flat hourly movement as of the timestamp together suggest the repricing already happened. Traders absorbed new weather model data, likely the 06Z or 12Z Japan Meteorological Agency ensemble runs showing the June 10 surface low tracking near 19°C, and bid the outcome up sharply. The market has since stabilized, which often means the information is now priced in.

Total volume of $9,511 is thin by major market standards, and 24-hour volume of $7,460 means most of the liquidity entered the book very recently. Liquidity at $24,829 is reasonably healthy relative to volume, so the order book can absorb modest new bets without large slippage. Still, a market this size can reprice sharply if new weather model guidance arrives overnight before the June 10 resolution window closes.

Key Factors

• The 24-hour price change of plus 25.3% combined with a trend score of 59.71 points to a model-driven repricing event, not random trading noise.
• The 1-hour change of 0.0% shows the market has stabilized after the surge, suggesting the new information is already absorbed.
• Volume concentration in the last 24 hours (78% of total volume) confirms this market activated late, consistent with traders waiting for short-range forecast models to converge.
• Competing outcomes like 18°C and 20°C hold meaningful implied probability, keeping YES as a plurality leader rather than a clear favorite above 50%.
• Thin total volume below $10,000 means a single large bet could shift the price materially before the 12:00 UTC close tomorrow.

Lines Analysis: What the Weather Data Says About Tokyo on June 10

Early June in Tokyo sits right at the edge of the plum rain season, or tsuyu. The Japan Meteorological Agency typically announces tsuyu onset for the Kanto region (which includes Tokyo) between early and mid-June. When tsuyu is active, cloud cover and moisture trap overnight heat, pushing minimums toward 20°C or above. When tsuyu has not yet arrived, clearer nights can pull minimums into the 17°C to 19°C range. The current 36.5% probability on 19°C is consistent with model guidance showing a transitional atmospheric pattern, warm enough to keep the low from dropping sharply, cool enough to keep it from stalling at 20°C or above.

The case against 19°C resolving as the winner comes from adjacent buckets. The 20°C outcome benefits from any tsuyu-adjacent moisture surge keeping temperatures elevated through the night. The 18°C outcome gains if a brief dry slot or wind shift allows more radiative cooling than current models project. Either scenario is plausible within the forecast uncertainty window. A 1-degree shift in the overnight minimum, which is well within normal model error at 24 to 36 hours range, completely redirects the payout.

Signals to Monitor

• Japan Meteorological Agency evening forecast update for June 9 to 10: any downward revision in overnight lows would boost 18°C at the expense of 19°C.
• Tsuyu front position: if the seasonal rain front stalls north of Tokyo, cloud cover decreases and overnight cooling accelerates, pulling minimums below 19°C.
• Surface wind direction at dusk on June 9: southerly winds from Tokyo Bay hold overnight temperatures higher, favoring 20°C outcomes.
• Any Otemachi station anomaly or data delay: resolution depends on the official JMA minimum, so any observational irregularity becomes relevant at close.
• Competing outcome price movement on 18°C and 20°C: if either surges before 12:00 UTC June 10, it signals fresh model guidance that would reprice the 19°C bucket.

Total volume of $9,511 is not enough to declare strong collective conviction. The data flow from JMA model runs in the next 12 to 18 hours will determine whether the 25.3% repricing holds or reverses before the resolution window closes.

LINES VERDICT

NARROW PLURALITY, HIGH UNCERTAINTY

The 19°C outcome is the most likely single result given current model guidance, but a 36.5% probability means the market is pricing the full width of forecast uncertainty. The data doesn’t care about the politics, and right now the data puts Tokyo’s June 10 overnight minimum in a zone where a 1-degree error in either direction completely changes the outcome.

What the market says: At 36.5% implied probability, the market treats 19°C as the plurality leader but not a dominant favorite. Thin volume below $10,000 means volatility risk before the June 10 12:00 UTC close is real.

Key unknown: The final JMA ensemble model run on the evening of June 9 will either confirm the current temperature trajectory or shift it by 1 degree. That single data release is the most important price mover remaining before this market closes.

Scientific Context: Tokyo June Temperature Norms

Tokyo’s historical average daily minimum for early to mid-June runs between 17°C and 20°C depending on whether the tsuyu seasonal rain front has established. In years when tsuyu arrives early, overnight lows track toward the upper end of that range. In years with delayed onset, lows sit closer to 17°C to 18°C. The 19°C bucket sits squarely at the climatological center of this range, which is precisely why it carries the highest single-outcome probability despite remaining below 50%. The market is pricing the statistical mode of Tokyo’s June overnight temperature distribution, not a dramatic weather event.