Recent forecast runs from the Finnish Meteorological Institute and supporting models indicate a daytime maximum of 16°C in Helsinki on September 19, driven by persistent southwesterly flow and extensive cloud cover that limits solar heating while preventing significant cooling. This aligns with the market's strong 53.5% implied probability for 16°C and 33% for 17°C, as ensembles show limited upside from warmer advection but some risk of 15°C if showers intensify. Historical September climatology places average highs near 15°C, making the current setup modestly above normal yet consistent with trader consensus on modest variability in the 15–17°C range ahead of final model updates.
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 19?
Highest temperature in Helsinki on September 19?
16°C 53%
17°C 32%
15°C 11%
18°C 8%
NEW
NEW
Sep 19, 2026
11°C or below
<1%
12°C
2%
13°C
4%
14°C
5%
15°C
11%
16°C
53%
17°C
32%
18°C
8%
19°C
2%
20°C
2%
21°C or higher
<1%
16°C 53%
17°C 32%
15°C 11%
18°C 8%
NEW
NEW
Sep 19, 2026
11°C or below
$228 Vol.
<1%
12°C
$0 Vol.
2%
13°C
$0 Vol.
4%
14°C
$7 Vol.
5%
15°C
$58 Vol.
11%
16°C
$200 Vol.
53%
17°C
$116 Vol.
32%
18°C
$49 Vol.
8%
19°C
$0 Vol.
2%
20°C
$0 Vol.
2%
21°C or higher
$64 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 19 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 forecast runs from the Finnish Meteorological Institute and supporting models indicate a daytime maximum of 16°C in Helsinki on September 19, driven by persistent southwesterly flow and extensive cloud cover that limits solar heating while preventing significant cooling. This aligns with the market's strong 53.5% implied probability for 16°C and 33% for 17°C, as ensembles show limited upside from warmer advection but some risk of 15°C if showers intensify. Historical September climatology places average highs near 15°C, making the current setup modestly above normal yet consistent with trader consensus on modest variability in the 15–17°C range ahead of final model updates.
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 19 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 17, 2026, 12:58 AM ET
Volume
$722End Date
Sep 19, 2026Market Opened
Sep 17, 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 19 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 forecast runs from the Finnish Meteorological Institute and supporting models indicate a daytime maximum of 16°C in Helsinki on September 19, driven by persistent southwesterly flow and extensive cloud cover that limits solar heating while preventing significant cooling. This aligns with the market's strong 53.5% implied probability for 16°C and 33% for 17°C, as ensembles show limited upside from warmer advection but some risk of 15°C if showers intensify. Historical September climatology places average highs near 15°C, making the current setup modestly above normal yet consistent with trader consensus on modest variability in the 15–17°C range ahead of final model updates.
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 19 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
$722End Date
Sep 19, 2026Market Opened
Sep 17, 2026, 12:58 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=efhkResolver
0x69c47De9D...Recent forecast runs from the Finnish Meteorological Institute and supporting models indicate a daytime maximum of 16°C in Helsinki on September 19, driven by persistent southwesterly flow and extensive cloud cover that limits solar heating while preventing significant cooling. This aligns with the market's strong 53.5% implied probability for 16°C and 33% for 17°C, as ensembles show limited upside from warmer advection but some risk of 15°C if showers intensify. Historical September climatology places average highs near 15°C, making the current setup modestly above normal yet consistent with trader consensus on modest variability in the 15–17°C range ahead of final model updates.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated
Beware of external links.
Beware of external links.
Frequently Asked Questions