Recent ensemble forecasts from the Finnish Meteorological Institute and ECMWF place Helsinki’s June 25 maximum near 19–20 °C, anchoring the market’s tight distribution across the 20 °C (22 %) and 21 °C (20.5 %) bins. Differentiation among adjacent outcomes stems from small uncertainties in low-level cloud cover, boundary-layer mixing depth, and the strength of southerly advection ahead of a weak trough; each can alter the peak by 1–2 °C. With resolution two days away, the next high-resolution model cycles and surface observations will tighten the range, while climatological June highs near 19 °C provide the baseline against which current mild conditions are measured.
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 June 25?
Highest temperature in Helsinki on June 25?
21°C 100.0%
14°C or below <1%
15°C <1%
16°C <1%
$65,601 Vol.
$65,601 Vol.
Jun 25, 2026
14°C or below
No
15°C
No
16°C
No
17°C
No
18°C
No
19°C
No
20°C
No
21°C
Yes
22°C
No
23°C
No
24°C or higher
No
21°C 100.0%
14°C or below <1%
15°C <1%
16°C <1%
$65,601 Vol.
$65,601 Vol.
Jun 25, 2026
14°C or below
$200 Vol.
No
15°C
$7,730 Vol.
No
16°C
$1,089 Vol.
No
17°C
$3,873 Vol.
No
18°C
$4,635 Vol.
No
19°C
$6,735 Vol.
No
20°C
$14,025 Vol.
No
21°C
$8,932 Vol.
Yes
22°C
$5,979 Vol.
No
23°C
$6,050 Vol.
No
24°C or higher
$6,352 Vol.
No
This market will resolve to the temperature range that contains the highest temperature recorded at the Helsinki Vantaa Airport Station in degrees Celsius on 25 Jun '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the Helsinki Vantaa Airport Station, available here: https://www.wunderground.com/history/daily/fi/vantaa/EFHK.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve until the first data point for the following date has been published on the resolution source.
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 ensemble forecasts from the Finnish Meteorological Institute and ECMWF place Helsinki’s June 25 maximum near 19–20 °C, anchoring the market’s tight distribution across the 20 °C (22 %) and 21 °C (20.5 %) bins. Differentiation among adjacent outcomes stems from small uncertainties in low-level cloud cover, boundary-layer mixing depth, and the strength of southerly advection ahead of a weak trough; each can alter the peak by 1–2 °C. With resolution two days away, the next high-resolution model cycles and surface observations will tighten the range, while climatological June highs near 19 °C provide the baseline against which current mild conditions are measured.
This market will resolve to the temperature range that contains the highest temperature recorded at the Helsinki Vantaa Airport Station in degrees Celsius on 25 Jun '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the Helsinki Vantaa Airport Station, available here: https://www.wunderground.com/history/daily/fi/vantaa/EFHK.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve until the first data point for the following date has been published on the resolution source.
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 Wunderground, specifically the highest temperature recorded for all times on this day for the Helsinki Vantaa Airport Station, available here: https://www.wunderground.com/history/daily/fi/vantaa/EFHK.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve until the first data point for the following date has been published on the resolution source.
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: Jun 23, 2026, 1:10 AM ET
Volume
$65,601End Date
Jun 25, 2026Market Opened
Jun 23, 2026, 1:10 AM ETResolution Source
https://www.wunderground.com/history/daily/fi/vantaa/EFHKResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
This market will resolve to the temperature range that contains the highest temperature recorded at the Helsinki Vantaa Airport Station in degrees Celsius on 25 Jun '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the Helsinki Vantaa Airport Station, available here: https://www.wunderground.com/history/daily/fi/vantaa/EFHK.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve until the first data point for the following date has been published on the resolution source.
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 ensemble forecasts from the Finnish Meteorological Institute and ECMWF place Helsinki’s June 25 maximum near 19–20 °C, anchoring the market’s tight distribution across the 20 °C (22 %) and 21 °C (20.5 %) bins. Differentiation among adjacent outcomes stems from small uncertainties in low-level cloud cover, boundary-layer mixing depth, and the strength of southerly advection ahead of a weak trough; each can alter the peak by 1–2 °C. With resolution two days away, the next high-resolution model cycles and surface observations will tighten the range, while climatological June highs near 19 °C provide the baseline against which current mild conditions are measured.
This market will resolve to the temperature range that contains the highest temperature recorded at the Helsinki Vantaa Airport Station in degrees Celsius on 25 Jun '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the Helsinki Vantaa Airport Station, available here: https://www.wunderground.com/history/daily/fi/vantaa/EFHK.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve until the first data point for the following date has been published on the resolution source.
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 Wunderground, specifically the highest temperature recorded for all times on this day for the Helsinki Vantaa Airport Station, available here: https://www.wunderground.com/history/daily/fi/vantaa/EFHK.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve until the first data point for the following date has been published on the resolution source.
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
$65,601End Date
Jun 25, 2026Market Opened
Jun 23, 2026, 1:10 AM ETResolution Source
https://www.wunderground.com/history/daily/fi/vantaa/EFHKResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
Recent ensemble forecasts from the Finnish Meteorological Institute and ECMWF place Helsinki’s June 25 maximum near 19–20 °C, anchoring the market’s tight distribution across the 20 °C (22 %) and 21 °C (20.5 %) bins. Differentiation among adjacent outcomes stems from small uncertainties in low-level cloud cover, boundary-layer mixing depth, and the strength of southerly advection ahead of a weak trough; each can alter the peak by 1–2 °C. With resolution two days away, the next high-resolution model cycles and surface observations will tighten the range, while climatological June highs near 19 °C provide the baseline against which current mild conditions are measured.
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