Recent forecasts from European models indicate Helsinki's overnight minimum on September 21 will likely fall between 9–12 °C, driven by a shift to northerly flow behind a weakening frontal system and partial clearing that allows moderate radiative cooling under light winds. Persistent cloud cover and residual moisture from earlier showers may limit temperature drops, while any earlier clearance or stronger northerly advection could push readings toward 8 °C or lower. Historical September lows average near 8 °C, providing context for the current near-normal setup, yet ensemble spreads remain wide enough that final observed values depend on precise timing of wind shifts and sky conditions overnight. Market-implied odds reflect this narrow range of plausible outcomes amid genuine short-term forecast uncertainty.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedLowest temperature in Helsinki on September 21?
Lowest temperature in Helsinki on September 21?
14°C or higher 94%
9°C 54%
4°C or below 48.5%
6°C 40%
NEW
NEW
Sep 21, 2026
4°C or below
49%
5°C
39%
6°C
40%
7°C
39%
8°C
40%
9°C
42%
10°C
21%
11°C
39%
12°C
39%
13°C
3%
14°C or higher
94%
14°C or higher 94%
9°C 54%
4°C or below 48.5%
6°C 40%
NEW
NEW
Sep 21, 2026
4°C or below
$0 Vol.
49%
5°C
$0 Vol.
39%
6°C
$0 Vol.
40%
7°C
$0 Vol.
39%
8°C
$0 Vol.
40%
9°C
$98 Vol.
42%
10°C
$98 Vol.
21%
11°C
$0 Vol.
39%
12°C
$0 Vol.
39%
13°C
$20 Vol.
3%
14°C or higher
$0 Vol.
94%
This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the Helsinki Vantaa Airport Station in degrees Celsius on 21 Sep '26.
The resolution source for this market will be information from NOAA, specifically the lowest 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 forecasts from European models indicate Helsinki's overnight minimum on September 21 will likely fall between 9–12 °C, driven by a shift to northerly flow behind a weakening frontal system and partial clearing that allows moderate radiative cooling under light winds. Persistent cloud cover and residual moisture from earlier showers may limit temperature drops, while any earlier clearance or stronger northerly advection could push readings toward 8 °C or lower. Historical September lows average near 8 °C, providing context for the current near-normal setup, yet ensemble spreads remain wide enough that final observed values depend on precise timing of wind shifts and sky conditions overnight. Market-implied odds reflect this narrow range of plausible outcomes amid genuine short-term forecast uncertainty.
This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the Helsinki Vantaa Airport Station in degrees Celsius on 21 Sep '26.
The resolution source for this market will be information from NOAA, specifically the lowest 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 lowest 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 19, 2026, 12:31 AM ET
Volume
$217End Date
Sep 21, 2026Market Opened
Sep 19, 2026, 12:31 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=efhkResolver
0x69c47De9D...This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the Helsinki Vantaa Airport Station in degrees Celsius on 21 Sep '26.
The resolution source for this market will be information from NOAA, specifically the lowest 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 forecasts from European models indicate Helsinki's overnight minimum on September 21 will likely fall between 9–12 °C, driven by a shift to northerly flow behind a weakening frontal system and partial clearing that allows moderate radiative cooling under light winds. Persistent cloud cover and residual moisture from earlier showers may limit temperature drops, while any earlier clearance or stronger northerly advection could push readings toward 8 °C or lower. Historical September lows average near 8 °C, providing context for the current near-normal setup, yet ensemble spreads remain wide enough that final observed values depend on precise timing of wind shifts and sky conditions overnight. Market-implied odds reflect this narrow range of plausible outcomes amid genuine short-term forecast uncertainty.
This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the Helsinki Vantaa Airport Station in degrees Celsius on 21 Sep '26.
The resolution source for this market will be information from NOAA, specifically the lowest 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 lowest 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
$217End Date
Sep 21, 2026Market Opened
Sep 19, 2026, 12:31 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=efhkResolver
0x69c47De9D...Recent forecasts from European models indicate Helsinki's overnight minimum on September 21 will likely fall between 9–12 °C, driven by a shift to northerly flow behind a weakening frontal system and partial clearing that allows moderate radiative cooling under light winds. Persistent cloud cover and residual moisture from earlier showers may limit temperature drops, while any earlier clearance or stronger northerly advection could push readings toward 8 °C or lower. Historical September lows average near 8 °C, providing context for the current near-normal setup, yet ensemble spreads remain wide enough that final observed values depend on precise timing of wind shifts and sky conditions overnight. Market-implied odds reflect this narrow range of plausible outcomes amid genuine short-term forecast uncertainty.
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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