Official hourly observations from MetService at Wellington International Airport confirm the highest temperature reached 18°C around midday on April 18, 2026, amid strong northerly winds up to 50 km/h and intermittent rain that limited solar heating. Subsequent heavy showers and squally thunderstorms, under active severe weather warnings from MetService, have cooled conditions to the mid-teens °C, aligning with forecast model consensus for a daily maximum of 17–18°C during Wellington's cool autumn season (historical April highs average 16–17°C). Trader consensus at 100% implied probability for 18°C reflects this observational lock-in, with final NIWA data expected post-midnight; only an improbable late-day clearing without cloud cover could push toward 19°C, though current atmospheric stability and gale forecasts make this highly unlikely.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedHighest temperature in Wellington on April 18?
18°C 100.0%
11°C or below <1%
12°C <1%
13°C <1%
$145,149 Vol.
$145,149 Vol.
11°C or below
No
12°C
No
13°C
No
14°C
No
15°C
No
16°C
No
17°C
No
18°C
Yes
19°C
No
20°C
No
21°C or higher
No
18°C 100.0%
11°C or below <1%
12°C <1%
13°C <1%
$145,149 Vol.
$145,149 Vol.
11°C or below
No
12°C
No
13°C
No
14°C
No
15°C
No
16°C
No
17°C
No
18°C
Yes
19°C
No
20°C
No
21°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: Apr 16, 2026, 1:16 AM ET
Resolution Source
https://www.wunderground.com/history/daily/nz/wellington/NZWNResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: 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.
Resolution Source
https://www.wunderground.com/history/daily/nz/wellington/NZWNResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
Official hourly observations from MetService at Wellington International Airport confirm the highest temperature reached 18°C around midday on April 18, 2026, amid strong northerly winds up to 50 km/h and intermittent rain that limited solar heating. Subsequent heavy showers and squally thunderstorms, under active severe weather warnings from MetService, have cooled conditions to the mid-teens °C, aligning with forecast model consensus for a daily maximum of 17–18°C during Wellington's cool autumn season (historical April highs average 16–17°C). Trader consensus at 100% implied probability for 18°C reflects this observational lock-in, with final NIWA data expected post-midnight; only an improbable late-day clearing without cloud cover could push toward 19°C, though current atmospheric stability and gale forecasts make this highly unlikely.
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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