Trader consensus on Polymarket tilts toward 18°C (35.5%) as Wellington's highest temperature on March 20, driven by MetService's latest GFS and NZLAM model ensembles forecasting a peak of 17-19°C under a weak high-pressure ridge. This closely matched spread reflects minor divergences in cloud cover and wind advection: light northerlies could nudge toward 19°C with clearer skies boosting insolation, while post-frontal southerlies favor 17°C by enhancing coastal cooling from the Tasman Sea. Historical March maxima average 19.5°C, but La Niña-modulated autumn patterns suppress extremes, with low model uncertainty yielding tight odds; watch for 0600 UTC updates tomorrow for resolution-defining refinements.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Wellington on March 20?
Highest temperature in Wellington on March 20?
18°C 37%
17°C 30%
19°C 15%
16°C 13%
$16,636 Vol.
$16,636 Vol.
13°C or below
<1%
14°C
2%
15°C
1%
16°C
13%
17°C
30%
18°C
37%
19°C
15%
20°C
3%
21°C
1%
22°C
1%
23°C or higher
<1%
18°C 37%
17°C 30%
19°C 15%
16°C 13%
$16,636 Vol.
$16,636 Vol.
13°C or below
<1%
14°C
2%
15°C
1%
16°C
13%
17°C
30%
18°C
37%
19°C
15%
20°C
3%
21°C
1%
22°C
1%
23°C or higher
<1%
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 16, 2026, 6:02 AM ET
Resolution Source
https://www.wunderground.com/history/daily/nz/wellington/NZWNResolver
0x69c47De9D...Resolution Source
https://www.wunderground.com/history/daily/nz/wellington/NZWNResolver
0x69c47De9D...Trader consensus on Polymarket tilts toward 18°C (35.5%) as Wellington's highest temperature on March 20, driven by MetService's latest GFS and NZLAM model ensembles forecasting a peak of 17-19°C under a weak high-pressure ridge. This closely matched spread reflects minor divergences in cloud cover and wind advection: light northerlies could nudge toward 19°C with clearer skies boosting insolation, while post-frontal southerlies favor 17°C by enhancing coastal cooling from the Tasman Sea. Historical March maxima average 19.5°C, but La Niña-modulated autumn patterns suppress extremes, with low model uncertainty yielding tight odds; watch for 0600 UTC updates tomorrow for resolution-defining refinements.
Experimental AI-generated summary referencing Polymarket data · Updated
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