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Will the highest temperature in Tokyo be 20°C on October 26?

Named source: polymarket-upload.s3.us-east-2.amazonaws.com · End date Oct 26, 8:00 AM ET · Live market: Will the highest temperature in Tokyo be 20°C on October 26? · View rules on Polymarket (international site) ↗

The short version

How to read this page

Traders put the chance of the highest temperature in Tokyo being 20°C on October 26 at less than 1%.

It fell 53 points today, and there is too little trading near the price to say whether buyers or sellers outnumber the other.

Low surprise risk: it needs a formal signing or legal effect, not just headlines.

Describes the price, the order book and the contract rules. Not advice and not a recommendation.

Polymarket prices shown here come from Polymarket’s international site (polymarket.com), which is not available to US residents. Polymarket US is a separate CFTC-regulated venue with its own prices. Prediction market access depends on where you live. Follow each venue’s terms and location rules, and do not use a VPN or other tools to get around them.

The details

Rule note: needs formal signingSettled by polymarket-upload.s3.us-east-2.amazonaws.com
Fine-print risk
Low (5/100)
Effective

Pro adds the exact price, today’s change in points, buyers vs sellers in dollars, the price chart and every recorded move. See Pro

  • Official source: settlement runs on Named URL in rules: polymarket-upload.s3.us-east-2.amazonaws.com. No recorded moves for this market yet.
  • Fine print: Press announcements or committee votes do not settle Yes; formal signing or enactment before the deadline is required. Deadline: Mon, Oct 26, 2026, 18:00 ET. If a second venue lists the same question, compare its named source, cutoff time and timezone, and fallback.

Source named: polymarket-upload.s3.us-east-2.amazonaws.com (not a tracked official feed, no release history)

Standardized read of public order book, official-source and contract-rule data, identical for every viewer. It describes the data and is not a recommendation. The venue’s published rules control settlement.

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Will the highest temperature in Tokyo be 20°C on October 26?

5-point rule check

Polymarket

Named source: polymarket-upload.s3.us-east-2.amazonaws.com
Fine-print risk: Low (5/100)
  1. Source
  2. Deadline
  3. Counts as Yes
  4. Backup rules
  5. Other venues
Fine-print risk Low 5
1.
Who settles it (official source)
Named URL in rules: polymarket-upload.s3.us-east-2.amazonaws.com · https://aviationweather.gov/api/data/metar?ids=RJTT&format=raw&date=2026-10-26T18:00:00Z&hours=30
2.
Deadline and time zone
Mon, Oct 26, 2026, 18:00 ET America/New_York
3.
What counts as Yes
EffectiveRequires the measure to actually take effect; signing or announcing alone does not count. Rule text: "…e station's local time (including any daylight-saving shift in effect), falls on the observation date. This market will resolve a…"
4.
Backup rules (delays, cancellations, revisions)
The report the resolution source shows for a given observation time is the one that counts, whether or not it is marked as a correction (COR). In the case that the Resolution Source publishes data, sufficient to settle a Market, that is clearly erroneous and the result of technical or operational error, or of unauthorized interference with the Resolution Source or its data, the Market may remain open for a period of up to seven (7) calendar days (ET) from the time of the original release, in anticipation of a correction by the Resolution Source. If no corrected value is published within that period, Polymarket will issue a Clarification to determine whether the originally published value may be eligible for resolution, or whether other action is required to preserve the orderly functioning of the Market.
5.
Fine print and other venues
Cross-venue & fine-print settlement trap: If a second venue lists the same question, compare its named source, cutoff time and timezone, and fallback; Polymarket disputes go to the UMA Optimistic Oracle while Kalshi follows CFTC-filed contract terms.
Rules text on file (Polymarket)

This market will resolve to the temperature range that contains the highest temperature reported at Tokyo Haneda Airport (RJTT) on 26 Oct '26. The qualifying value is the highest temperature reported in the hourly temperature remark of any routine (METAR) observation for Tokyo Haneda Airport (RJTT) on that date, in tenths of a degree Celsius as reported. A report whose line begins with SPECI is a special observation and does not count. Every other report is routine, including one issued off the nominal hour and one that carries no METAR or SPECI label. For How to Read the METAR Report, see: https://polymarket-upload.s3.us-east-2.amazonaws.com/market_products/Weather/How+to+Read+the+METAR+Report.pdf The hourly temperature remark is the group beginning with the letter T followed by exactly eight digits. After the T, one digit for sign (0 positive, 1 negative) and three for tenths of a degree Celsius give the temperature; the following four are the dew point and are not used. T01390133 is 13.9°C; T10171022 is −1.7°C. If a routine observation does not carry the hourly temperature remark, the temperature group in the body of that observation governs for that observation, in whole degrees Celsius as reported. It appears as temperature and dew point separated by a slash, with M marking a negative value: 18/12 is 18°C; M11/M17 is −11°C. An observation that reports no temperature in either place is disregarded. Each market in this event states its range in whole degrees Celsius. The qualifying value is rounded to the nearest whole degree, with a value ending in exactly half rounded up to the next higher whole degree, and that whole Celsius value determines which range contains it. For example, 13.9°C counts as 14°C; 17.4°C counts as 17°C; 16.5°C counts as 17°C; −1.7°C counts as −2°C; −8.5°C counts as −8°C. An observation counts if its time stamp, converted to the station's local time (including any daylight-saving shift in effect), falls on the observation date. This market will resolve at the issuance of the first METAR observation for the station on the day following the observation date or by 11:59 PM ET on the day following the observation date, whichever comes first. Resolution is determined from the observations the resolution source shows for the observation date. In the event that the Aviation Weather Center has published no routine observation reporting a temperature for the observation date by 11:59 PM ET on the day following the observation date, the Weather Underground Daily Observations table will be used as the resolution source. In the event that neither source has published data sufficient to determine a temperature for the observation date by 11:59 PM ET on the day following the observation date, this market will resolve to the lowest bracket. The report the resolution source shows for a given observation time is the one that counts, whether or not it is marked as a correction (COR). Changes to observations within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered. Where the first routine observation for the following date is published before that deadline, resolution is determined from a read taken after it. Where it is not, resolution is determined from a read taken at that deadline. In the case that the Resolution Source publishes data, sufficient to settle a Market, that is clearly erroneous and the result of technical or operational error, or of unauthorized interference with the Resolution Source or its data, the Market may remain open for a period of up to seven (7) calendar days (ET) from the time of the original release, in anticipation of a correction by the Resolution Source. If the Resolution Source publishes a corrected value within that period, that value will be eligible for resolution. If no corrected value is published within that period, Polymarket will issue a Clarification to determine whether the originally published value may be eligible for resolution, or whether other action is required to preserve the orderly functioning of the Market. The resolution source for this market will be the routine observations for Tokyo Haneda Airport (RJTT) published here: https://aviationweather.gov/api/data/metar?ids=RJTT&format=raw&date=2026-10-26T18:00:00Z&hours=30

Will the highest temperature in Tokyo be 20°C on October 26?: resolution rules & settlement traps · PolyTruth