TOTAL VOLUME:

$134b

24H VOL:

$107,351,958

24H TRANSACTIONS:

2,388,728,490

OPEN INTEREST:

$1,416,970,024

400,720

Markets across

30,097

events

MATCHED EVENTS:

2,633

PLATFORM COVERAGE:

5

Polymarket:

39%

VS.

Kalshi:

61%

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Highest temperature in London on September 21?
predict

Highest temperature in London on September 21?

Volume:
$10

23°C

 - Predict

23°C - Predict

1W

News

Positive

Negative

Neutral

Hover marker for details

Vol.

·

Resolved Sep 22, 2026

Closed: Sep 21, 8:00 AM EST

predict

Predict

View
Outcome
Trade
Chance %
Price
Spread
Liquidity
Volume
24h
7d
Open Interest
Ends in
Result
predict

23°C

View
88%
Yes 88¢No 12¢
—
N/A
$10
N/A
N/A
N/A
Settled
Yes
predict

18°C or below

N/A
N/A
—
$9
N/A
N/A
N/A
N/A
Settled
No
predict

19°C

N/A
N/A
—
N/A
N/A
N/A
N/A
N/A
Settled
No
predict

20°C

N/A
N/A
—
$2,450
N/A
N/A
N/A
N/A
Settled
No
predict

21°C

N/A
N/A
—
N/A
N/A
N/A
N/A
N/A
Settled
No
predict

22°C

N/A
N/A
—
N/A
N/A
N/A
N/A
N/A
Settled
No
predict

24°C

N/A
N/A
—
N/A
N/A
N/A
N/A
N/A
Settled
No
predict

25°C

N/A
N/A
—
N/A
N/A
N/A
N/A
N/A
Settled
No
predict

26°C

N/A
N/A
—
N/A
N/A
N/A
N/A
N/A
Settled
No
predict

27°C

N/A
N/A
—
N/A
N/A
N/A
N/A
N/A
Settled
No
predict

28°C or higher

N/A
N/A
—
$2
N/A
N/A
N/A
N/A
Settled
No
Total markets: 11

Description

This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the London City Airport Station in degrees Celsius on 21 Sep '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=eglc 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. 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.

Predict

This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the London City Airport Station in degrees Celsius on 21 Sep '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=eglc 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. 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.