Trader consensus on Polymarket has locked in a 100% implied probability for a highest temperature of 16°C in Helsinki on May 12, driven by Finnish Meteorological Institute (FMI) observations at the official Helsinki-Vantaa Airport station, which recorded a midday peak of 16°C before cooling to 10-12°C amid persistent cloud cover, southerly winds of 5-6 m/s, and scattered light precipitation limiting insolation. ECMWF and GFS forecast models align, projecting no further diurnal warming as the day progresses into evening. This fits May climatology averages of 14-15°C highs. Realistic challenges include a rare post-finalization data revision upward from microclimatic sensor discrepancies or improbable clearing for a late-afternoon surge, with FMI bulletins expected post-midnight to confirm resolution via Wunderground archives.
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 May 12?
16°C 100.0%
8°C or below <1%
9°C <1%
10°C <1%
$81,093 Vol.
$81,093 Vol.
8°C or below
No
9°C
No
10°C
No
11°C
No
12°C
No
13°C
No
14°C
No
15°C
No
16°C
Yes
17°C
No
18°C or higher
No
16°C 100.0%
8°C or below <1%
9°C <1%
10°C <1%
$81,093 Vol.
$81,093 Vol.
8°C or below
No
9°C
No
10°C
No
11°C
No
12°C
No
13°C
No
14°C
No
15°C
No
16°C
Yes
17°C
No
18°C or higher
No
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the Helsinki Vantaa Airport Station once information is finalized, 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 to "Yes" until all data for this date has been finalized.
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.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
Market Opened: May 10, 2026, 12:11 AM ET
Resolution Source
https://www.wunderground.com/history/daily/fi/vantaa/EFHKResolver
0x69c47De9D...Outcome proposed: Yes
No dispute
Final outcome: Yes
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the Helsinki Vantaa Airport Station once information is finalized, 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 to "Yes" until all data for this date has been finalized.
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.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
Resolution Source
https://www.wunderground.com/history/daily/fi/vantaa/EFHKResolver
0x69c47De9D...Outcome proposed: Yes
No dispute
Final outcome: Yes
Trader consensus on Polymarket has locked in a 100% implied probability for a highest temperature of 16°C in Helsinki on May 12, driven by Finnish Meteorological Institute (FMI) observations at the official Helsinki-Vantaa Airport station, which recorded a midday peak of 16°C before cooling to 10-12°C amid persistent cloud cover, southerly winds of 5-6 m/s, and scattered light precipitation limiting insolation. ECMWF and GFS forecast models align, projecting no further diurnal warming as the day progresses into evening. This fits May climatology averages of 14-15°C highs. Realistic challenges include a rare post-finalization data revision upward from microclimatic sensor discrepancies or improbable clearing for a late-afternoon surge, with FMI bulletins expected post-midnight to confirm resolution via Wunderground archives.
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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