**Trader consensus on 15°C as the day's high in Helsinki reflects official observations and model consensus from sources like the Finnish Meteorological Institute and NOAA data at Helsinki-Vantaa Airport, where afternoon readings peaked near 15°C (59°F) under clear skies and moderate northerly flow.** Persistent high pressure and northerly winds suppressed warming, aligning with seasonal norms for late September (typical highs 13–16°C) while preventing the brief spikes seen in earlier model runs. Late-day cooling under clear conditions locked in this outcome, with minimal precipitation or cloud cover to alter the thermal profile. Realistic challenges remain limited to last-minute observational revisions or station-specific microclimatic effects, though the tight clustering of forecasts across agencies makes significant deviation unlikely before market resolution.
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 22?
Highest temperature in Helsinki on September 22?
15°C 100.0%
9°C or below <1%
10°C <1%
11°C <1%
$50,746 Vol.
$50,746 Vol.
Sep 22, 2026
9°C or below
No
10°C
No
11°C
No
12°C
No
13°C
No
14°C
No
15°C
Yes
16°C
No
17°C
No
18°C
No
19°C or higher
No
15°C 100.0%
9°C or below <1%
10°C <1%
11°C <1%
$50,746 Vol.
$50,746 Vol.
Sep 22, 2026
9°C or below
$206 Vol.
No
10°C
$385 Vol.
No
11°C
$141 Vol.
No
12°C
$263 Vol.
No
13°C
$2,529 Vol.
No
14°C
$22,662 Vol.
No
15°C
$9,360 Vol.
Yes
16°C
$11,678 Vol.
No
17°C
$2,522 Vol.
No
18°C
$918 Vol.
No
19°C or higher
$82 Vol.
No
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 22 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.**Trader consensus on 15°C as the day's high in Helsinki reflects official observations and model consensus from sources like the Finnish Meteorological Institute and NOAA data at Helsinki-Vantaa Airport, where afternoon readings peaked near 15°C (59°F) under clear skies and moderate northerly flow.**
Persistent high pressure and northerly winds suppressed warming, aligning with seasonal norms for late September (typical highs 13–16°C) while preventing the brief spikes seen in earlier model runs. Late-day cooling under clear conditions locked in this outcome, with minimal precipitation or cloud cover to alter the thermal profile.
Realistic challenges remain limited to last-minute observational revisions or station-specific microclimatic effects, though the tight clustering of forecasts across agencies makes significant deviation unlikely before market resolution.
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 22 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 20, 2026, 12:58 AM ET
Volume
$50,746End Date
Sep 22, 2026Market Opened
Sep 20, 2026, 12:58 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=efhkResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
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 22 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.**Trader consensus on 15°C as the day's high in Helsinki reflects official observations and model consensus from sources like the Finnish Meteorological Institute and NOAA data at Helsinki-Vantaa Airport, where afternoon readings peaked near 15°C (59°F) under clear skies and moderate northerly flow.**
Persistent high pressure and northerly winds suppressed warming, aligning with seasonal norms for late September (typical highs 13–16°C) while preventing the brief spikes seen in earlier model runs. Late-day cooling under clear conditions locked in this outcome, with minimal precipitation or cloud cover to alter the thermal profile.
Realistic challenges remain limited to last-minute observational revisions or station-specific microclimatic effects, though the tight clustering of forecasts across agencies makes significant deviation unlikely before market resolution.
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 22 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
$50,746End Date
Sep 22, 2026Market Opened
Sep 20, 2026, 12:58 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=efhkResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
**Trader consensus on 15°C as the day's high in Helsinki reflects official observations and model consensus from sources like the Finnish Meteorological Institute and NOAA data at Helsinki-Vantaa Airport, where afternoon readings peaked near 15°C (59°F) under clear skies and moderate northerly flow.** Persistent high pressure and northerly winds suppressed warming, aligning with seasonal norms for late September (typical highs 13–16°C) while preventing the brief spikes seen in earlier model runs. Late-day cooling under clear conditions locked in this outcome, with minimal precipitation or cloud cover to alter the thermal profile. Realistic challenges remain limited to last-minute observational revisions or station-specific microclimatic effects, though the tight clustering of forecasts across agencies makes significant deviation unlikely before market resolution.
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