Recent ensemble forecasts from European models indicate a likely peak of 24–26°C in Helsinki on June 21, driven by southwesterly flow advecting mild maritime air under partly cloudy skies with light showers possible. This setup aligns with trader consensus favoring the 24–25°C outcomes, which together hold over half the market probability. Historical June highs average near 18–19°C at the official measurement site, but recent days have trended 2–3°C above normal amid stable high pressure. Key variables differentiating close bins include afternoon cloud timing, boundary-layer mixing depth, and exact frontal passage, with model spread creating genuine uncertainty in the 1–2°C range. Updated high-resolution runs and FMI observations over the next 48 hours will refine these probabilities ahead of 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 June 21?
Highest temperature in Helsinki on June 21?
27°C 100.0%
20°C or below <1%
21°C <1%
22°C <1%
$55,708 Vol.
$55,708 Vol.
Jun 21, 2026
20°C or below
No
21°C
No
22°C
No
23°C
No
24°C
No
25°C
No
26°C
No
27°C
Yes
28°C
No
29°C
No
30°C or higher
No
27°C 100.0%
20°C or below <1%
21°C <1%
22°C <1%
$55,708 Vol.
$55,708 Vol.
Jun 21, 2026
20°C or below
$313 Vol.
No
21°C
$3,287 Vol.
No
22°C
$4,767 Vol.
No
23°C
$5,600 Vol.
No
24°C
$4,754 Vol.
No
25°C
$9,992 Vol.
No
26°C
$8,034 Vol.
No
27°C
$7,707 Vol.
Yes
28°C
$6,710 Vol.
No
29°C
$2,530 Vol.
No
30°C or higher
$2,014 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 21 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 European models indicate a likely peak of 24–26°C in Helsinki on June 21, driven by southwesterly flow advecting mild maritime air under partly cloudy skies with light showers possible. This setup aligns with trader consensus favoring the 24–25°C outcomes, which together hold over half the market probability. Historical June highs average near 18–19°C at the official measurement site, but recent days have trended 2–3°C above normal amid stable high pressure. Key variables differentiating close bins include afternoon cloud timing, boundary-layer mixing depth, and exact frontal passage, with model spread creating genuine uncertainty in the 1–2°C range. Updated high-resolution runs and FMI observations over the next 48 hours will refine these probabilities ahead of resolution.
This market will resolve to the temperature range that contains the highest temperature recorded at the Helsinki Vantaa Airport Station in degrees Celsius on 21 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 19, 2026, 12:11 AM ET
Volume
$55,708End Date
Jun 21, 2026Market Opened
Jun 19, 2026, 12:11 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 21 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 European models indicate a likely peak of 24–26°C in Helsinki on June 21, driven by southwesterly flow advecting mild maritime air under partly cloudy skies with light showers possible. This setup aligns with trader consensus favoring the 24–25°C outcomes, which together hold over half the market probability. Historical June highs average near 18–19°C at the official measurement site, but recent days have trended 2–3°C above normal amid stable high pressure. Key variables differentiating close bins include afternoon cloud timing, boundary-layer mixing depth, and exact frontal passage, with model spread creating genuine uncertainty in the 1–2°C range. Updated high-resolution runs and FMI observations over the next 48 hours will refine these probabilities ahead of resolution.
This market will resolve to the temperature range that contains the highest temperature recorded at the Helsinki Vantaa Airport Station in degrees Celsius on 21 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
$55,708End Date
Jun 21, 2026Market Opened
Jun 19, 2026, 12:11 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 European models indicate a likely peak of 24–26°C in Helsinki on June 21, driven by southwesterly flow advecting mild maritime air under partly cloudy skies with light showers possible. This setup aligns with trader consensus favoring the 24–25°C outcomes, which together hold over half the market probability. Historical June highs average near 18–19°C at the official measurement site, but recent days have trended 2–3°C above normal amid stable high pressure. Key variables differentiating close bins include afternoon cloud timing, boundary-layer mixing depth, and exact frontal passage, with model spread creating genuine uncertainty in the 1–2°C range. Updated high-resolution runs and FMI observations over the next 48 hours will refine these probabilities ahead of 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