Trader consensus has locked in 17°C as Wellington, New Zealand's highest temperature on March 21 with near-certainty, propelled by MetService's official forecast predicting a high of exactly 17°C under persistent southerly winds and widespread low cloud cover suppressing solar heating. This aligns with ensemble model outputs from ECMWF and GFS, which converge on mild autumn conditions following a recent cool front, with dew points around 13°C limiting convective warmth. Historical March data from NIWA shows average highs of 19°C, but the current synoptic pattern—featuring a blocking high to the east—favors stability. Realistic challenges include unexpected cloud breaks boosting insolation by 2–3°C or a late northerly shift, though both trail at under 1% in probabilistic forecasts.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Wellington on March 21?
Highest temperature in Wellington on March 21?
17°C 100.0%
13°C or below <1%
14°C <1%
15°C <1%
$79,046 Vol.
$79,046 Vol.
13°C or below
No
14°C
No
15°C
No
16°C
No
17°C
Yes
18°C
No
19°C
No
20°C
No
21°C
No
22°C
No
23°C or higher
No
17°C 100.0%
13°C or below <1%
14°C <1%
15°C <1%
$79,046 Vol.
$79,046 Vol.
13°C or below
No
14°C
No
15°C
No
16°C
No
17°C
Yes
18°C
No
19°C
No
20°C
No
21°C
No
22°C
No
23°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 Wellington Intl Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/nz/wellington/NZWN.
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: Mar 17, 2026, 6:02 AM ET
Resolution Source
https://www.wunderground.com/history/daily/nz/wellington/NZWNResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
Resolution Source
https://www.wunderground.com/history/daily/nz/wellington/NZWNResolver
0x69c47De9D...Trader consensus has locked in 17°C as Wellington, New Zealand's highest temperature on March 21 with near-certainty, propelled by MetService's official forecast predicting a high of exactly 17°C under persistent southerly winds and widespread low cloud cover suppressing solar heating. This aligns with ensemble model outputs from ECMWF and GFS, which converge on mild autumn conditions following a recent cool front, with dew points around 13°C limiting convective warmth. Historical March data from NIWA shows average highs of 19°C, but the current synoptic pattern—featuring a blocking high to the east—favors stability. Realistic challenges include unexpected cloud breaks boosting insolation by 2–3°C or a late northerly shift, though both trail at under 1% in probabilistic forecasts.
Experimental AI-generated summary referencing Polymarket data · Updated
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