Recent numerical weather prediction runs from the Global Forecast System and regional models indicate a daily maximum temperature near 16°C in Helsinki on September 20 under moderate southwesterly flow, with periods of showers and broken cloud cover that will limit peak heating. This places the most likely outcome at or just above the long-term September average of roughly 14–15°C while keeping stronger warming or sharper cooling unlikely. Trader consensus favoring 17°C reflects modest model spread and recent mild anomalies, yet the tight clustering of forecasts around 16°C explains the secondary weighting on that exact threshold. Official verification from the Finnish Meteorological Institute will resolve the market once hourly observations are finalized.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedHighest temperature in Helsinki on September 20?
Highest temperature in Helsinki on September 20?
17°C 67%
16°C 22%
18°C 11%
15°C 3%
NEW
NEW
Sep 20, 2026
11°C or below
<1%
12°C
<1%
13°C
1%
14°C
1%
15°C
3%
16°C
22%
17°C
67%
18°C
11%
19°C
1%
20°C
<1%
21°C or higher
<1%
17°C 67%
16°C 22%
18°C 11%
15°C 3%
NEW
NEW
Sep 20, 2026
11°C or below
$181 Vol.
<1%
12°C
$637 Vol.
<1%
13°C
$41 Vol.
1%
14°C
$208 Vol.
1%
15°C
$251 Vol.
3%
16°C
$745 Vol.
22%
17°C
$607 Vol.
67%
18°C
$463 Vol.
11%
19°C
$177 Vol.
1%
20°C
$22 Vol.
<1%
21°C or higher
$260 Vol.
<1%
This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the Helsinki Vantaa Airport Station in degrees Celsius on 20 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=efhk
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.Recent numerical weather prediction runs from the Global Forecast System and regional models indicate a daily maximum temperature near 16°C in Helsinki on September 20 under moderate southwesterly flow, with periods of showers and broken cloud cover that will limit peak heating. This places the most likely outcome at or just above the long-term September average of roughly 14–15°C while keeping stronger warming or sharper cooling unlikely. Trader consensus favoring 17°C reflects modest model spread and recent mild anomalies, yet the tight clustering of forecasts around 16°C explains the secondary weighting on that exact threshold. Official verification from the Finnish Meteorological Institute will resolve the market once hourly observations are finalized.
This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the Helsinki Vantaa Airport Station in degrees Celsius on 20 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=efhk
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.
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=efhk
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.
Market Opened: Sep 18, 2026, 12:58 AM ET
Volume
$3,585End Date
Sep 20, 2026Market Opened
Sep 18, 2026, 12:58 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=efhkResolver
0x69c47De9D...This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the Helsinki Vantaa Airport Station in degrees Celsius on 20 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=efhk
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.Recent numerical weather prediction runs from the Global Forecast System and regional models indicate a daily maximum temperature near 16°C in Helsinki on September 20 under moderate southwesterly flow, with periods of showers and broken cloud cover that will limit peak heating. This places the most likely outcome at or just above the long-term September average of roughly 14–15°C while keeping stronger warming or sharper cooling unlikely. Trader consensus favoring 17°C reflects modest model spread and recent mild anomalies, yet the tight clustering of forecasts around 16°C explains the secondary weighting on that exact threshold. Official verification from the Finnish Meteorological Institute will resolve the market once hourly observations are finalized.
This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the Helsinki Vantaa Airport Station in degrees Celsius on 20 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=efhk
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.
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=efhk
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.
Volume
$3,585End Date
Sep 20, 2026Market Opened
Sep 18, 2026, 12:58 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=efhkResolver
0x69c47De9D...Recent numerical weather prediction runs from the Global Forecast System and regional models indicate a daily maximum temperature near 16°C in Helsinki on September 20 under moderate southwesterly flow, with periods of showers and broken cloud cover that will limit peak heating. This places the most likely outcome at or just above the long-term September average of roughly 14–15°C while keeping stronger warming or sharper cooling unlikely. Trader consensus favoring 17°C reflects modest model spread and recent mild anomalies, yet the tight clustering of forecasts around 16°C explains the secondary weighting on that exact threshold. Official verification from the Finnish Meteorological Institute will resolve the market once hourly observations are finalized.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated
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