The Prediction Markets

Highest temperature in Shanghai on October 21?

Full timeKickoff Waiting for the venues to settle
Traded
$50K
Venues
Polymarket
Prices updated
just now
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What the markets expect

21°C 98.8%

Next is 23°C at 0.5%. Only Polymarket lists this market, so there is no second price to compare.

21°C 98.8%23°C 0.5%22°C 0.2%17°C or below 0.1%18°C 0.1%3 others 0.3%

Odds by venue

Fair chance strips out each venue’s built-in margin (its prices add up to more than 100%), then blends the venues by how much has traded there, so the outcomes add up to 100%. Best Yes price is the cheapest ask across venues, and the payout is what a winning $100 stake returns before fees. Open a row for each venue’s contract name, bid and ask, and how closely their rules match.

Prices come from our regular polls of each venue. Ages are as of when this page was built.

  • Polymarket
21°C
98.8%
Polymarket 99.5%(98.8% fair)polled, 32s ago
Polymarket
Contract
21°C
Last price
99.5%
Fair, margin removed
98.8%
As of
Polled just now
Buy Yes
—
Sell Yes
99¢
Volume
$18K
Trade this on Polymarket
23°C
0.5%
Polymarket 0.6%polled, 32s agoBest Yes 1¢ on Polymarket, $100 pays $10,000 (100x)
Polymarket
Contract
23°C
Last price
0.6%
As of
Polled just now
Buy Yes
1¢
Sell Yes
0.1¢
$100 on Yes pays
$10,000 (100x)
Volume
$9K
Trade this on Polymarket
22°C
0.2%
Polymarket 0.2%polled, 32s agoBest Yes 0.4¢ on Polymarket, $100 pays $25,000 (250x)
Polymarket
Contract
22°C
Last price
0.2%
As of
Polled just now
Buy Yes
0.4¢
Sell Yes
—
$100 on Yes pays
$25,000 (250x)
Volume
$8K
Trade this on Polymarket
17°C or below
0.1%
Polymarket 0.1%polled, 32s agoBest Yes 0.1¢ on Polymarket, $100 pays $100,000 (1000x)
Polymarket
Contract
17°C or below
Last price
0.1%
As of
Polled just now
Buy Yes
0.1¢
Sell Yes
—
$100 on Yes pays
$100,000 (1000x)
Volume
$170
Trade this on Polymarket
18°C
0.1%
Polymarket 0.1%polled, 32s agoBest Yes 0.1¢ on Polymarket, $100 pays $100,000 (1000x)
Polymarket
Contract
18°C
Last price
0.1%
As of
Polled just now
Buy Yes
0.1¢
Sell Yes
—
$100 on Yes pays
$100,000 (1000x)
Volume
$713
Trade this on Polymarket
19°C
0.1%
Polymarket 0.1%polled, 32s agoBest Yes 0.1¢ on Polymarket, $100 pays $100,000 (1000x)
Polymarket
Contract
19°C
Last price
0.1%
As of
Polled just now
Buy Yes
0.1¢
Sell Yes
—
$100 on Yes pays
$100,000 (1000x)
Volume
$1K
Trade this on Polymarket
20°C
0.1%
Polymarket 0.1%polled, 32s agoBest Yes 0.1¢ on Polymarket, $100 pays $100,000 (1000x)
Polymarket
Contract
20°C
Last price
0.1%
As of
Polled just now
Buy Yes
0.1¢
Sell Yes
—
$100 on Yes pays
$100,000 (1000x)
Volume
$4K
Trade this on Polymarket
24°C
0.1%
Polymarket 0.1%polled, 32s agoBest Yes 0.2¢ on Polymarket, $100 pays $50,000 (500x)
Polymarket
Contract
24°C
Last price
0.1%
As of
Polled just now
Buy Yes
0.2¢
Sell Yes
—
$100 on Yes pays
$50,000 (500x)
Volume
$5K
Trade this on Polymarket
25°C
0%
Polymarket 0.1%polled, 32s agoBest Yes 0.1¢ on Polymarket, $100 pays $100,000 (1000x)
Polymarket
Contract
25°C
Last price
0.1%
As of
Polled just now
Buy Yes
0.1¢
Sell Yes
—
$100 on Yes pays
$100,000 (1000x)
Volume
$3K
Trade this on Polymarket
26°C
0%
Polymarket 0.1%polled, 32s agoBest Yes 0.1¢ on Polymarket, $100 pays $100,000 (1000x)
Polymarket
Contract
26°C
Last price
0.1%
As of
Polled just now
Buy Yes
0.1¢
Sell Yes
—
$100 on Yes pays
$100,000 (1000x)
Volume
$865
Trade this on Polymarket
27°C or higher
0%
Polymarket 0.1%polled, 32s agoBest Yes 0.1¢ on Polymarket, $100 pays $100,000 (1000x)
Polymarket
Contract
27°C or higher
Last price
0.1%
As of
Polled just now
Buy Yes
0.1¢
Sell Yes
—
$100 on Yes pays
$100,000 (1000x)
Volume
$295
Trade this on Polymarket

Who resolves this market

Polymarket
Polymarket resolves via:
UMA optimistic oracle, source: weather.gov

How the odds have moved

The top 3 outcomes on both venues, with the consensus between them. Hover for exact values.

  • 21°C
  • 23°C
  • 22°C

Order books

Each venue’s resting orders for the selected outcome’s Yes contract, side by side. Top of book streams live; depth refreshes every 15 seconds.

Top of book

Connecting
Best bid
—
Spread
—
Best ask
—

Waiting for the first live quote…

Depth · top 8 levels

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Recent trades

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What your stake buys

Enter a stake to see where it buys the most after fees, using each venue’s live order book.

$
Buy

Loading both order books…

Buys at the asks resting now (taker orders), cheapest after fees first, from order-book snapshots up to 15 seconds old. Fees: Kalshi 0.07 × price × (1 − price) per share, rounded up to the cent; Polymarket 0.05 × price × (1 − price) per share (other / general rate). Fee calculator. Estimates only, not advice.

About this market

Live prediction market odds for "Highest temperature in Shanghai on October 21?". 21°C leads at 98.8%. Next is 23°C at 0.5%. $50K has traded across 11 outcomes on Polymarket. The market is expected to resolve by Oct 21, 2026.

This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the Shanghai Pudong International Airport Station in degrees Celsius on 21 Oct '26. The resolution source for this market will be information from NOAA, specifically the highest reading under the "Temp" column for all times on this day, available here: https://www.weather.gov/wrh/timeseries?site=zspd If NOAA data for the observation date is unavailable 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 there is no data for the observation date by 11:59 PM ET on the day following the observation date, this market will resolve to the lowest bracket. To toggle between Fahrenheit and Celsius, click the "Switch to Metric Units" button until the relevant table displays °C. This market will resolve once the first data point for the following date has been published on the resolution source, or by 11:59 PM ET on the day following the observation date, whichever comes first. The resolution source for this market measures temperatures to whole degrees Celsius (eg, 9°C). Thus, this is the level of precision that will be used when resolving the market. 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. Revisions to temperatures recorded 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.

Questions

What does the consensus price mean?

It is the price of a Yes contract that pays $1 if the outcome happens. A 14¢ price means traders put the chance near 14%. Where two venues list the same outcome, we blend their last prices, weighting the venue with more trading volume more heavily (neither counts for less than a quarter). When only one outcome can win, each venue’s prices add up to a little over 100% (its margin); the fair chance removes that margin so the outcomes add up to exactly 100%.

How is the payout worked out?

A Yes contract pays $1 if it wins, so at the best ask a $100 stake buys 100 ÷ ask contracts. At 18¢ that is about 555 contracts, paying $556 (5.56x) if Yes happens. Venue fees and price slippage on larger orders are not included.

Why do the venues show different prices?

Each venue has its own traders, fees and order book. Contracts can also settle on slightly different terms, which is why each row lists how closely the rules match.

Is a price gap an arbitrage?

Only when you can buy Yes on one venue below what someone pays for Yes on the other, after fees, and both contracts settle the same way. We show the executable bid and ask so you can check.

How fresh are these prices?

Venue prices refresh every few minutes, and the order book and live quotes stream continuously. Each venue’s card shows when we last observed it.

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