Wellington, New Zealand, experiences peak September gusts shaped by its location in the Roaring Forties and the funneling effect of Cook Strait, where westerly and northerly flows accelerate over exposed terrain. Spring climatology drives rising average wind speeds through the month, with historical records showing frequent gusts exceeding 90–100 km/h at sites like Wellington Aero and Mt. Kaukau amid frontal passages and low-pressure systems. Current trader balance near 50% across thresholds reflects uncertainty in whether a strong synoptic event—potentially enhanced by lingering El Niño influences or neutral Southern Annular Mode conditions—will push extremes above 102 km/h or keep them in the 90–101 km/h range, as model guidance and early-month observations remain variable.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedPeak wind gust in the world's windiest city in September
102 km/h or above 51%
90 to 101 km/h 49%
89 km/h or below 49%
89 km/h or below
49%
90 to 101 km/h
49%
102 km/h or above
51%
102 km/h or above 51%
90 to 101 km/h 49%
89 km/h or below 49%
89 km/h or below
49%
90 to 101 km/h
49%
102 km/h or above
51%
The resolution source for this market is the gust value in the wind group of NZWN's raw METAR/SPECI observations, encoded in knots (for example, "34020G45KT" denotes a 45-knot gust), as archived by the Iowa Environmental Mesonet (IEM) for station NZWN in network NF__ASOS ("New Zealand ASOS"). Gust speed is converted from knots using 1 kt = 1.852 km/h, rounded half-up to the nearest whole number. Because gusts are reported in whole knots, no observed gust converts to a value on a bracket boundary, so every observation maps to exactly one range.
The month's highest gust can be located via the IEM Data Calendar for NZWN: https://mesonet.agron.iastate.edu/sites/hist.phtml?network=NF__ASOS&year=2026&month=9&mode=monthly&station=NZWN. Each calendar day displays that day's peak gust inline; clicking a day's date opens the daily Summary for NF__ASOS, where the Peak Gust column in the NZWN (Wellington) row shows the day's maximum. Ensure station NZWN is selected, as the NF__ASOS network includes other New Zealand stations. Note that the IEM calendar and summary pages display gusts in mph; resolution is based on the knot value in the underlying raw METAR, which IEM archives alongside each parsed observation and which can be used to independently verify any value.
If any observations are missing or unavailable, this market will resolve to the range containing the highest gust reported during the resolution window. Should the IEM archive be unavailable or discontinued, this market will resolve based on the equivalent raw METAR/SPECI observations for NZWN from another credible archive or the original reporting authority.
Market Opened: Aug 31, 2026, 9:46 AM ET
The resolution source for this market is the gust value in the wind group of NZWN's raw METAR/SPECI observations, encoded in knots (for example, "34020G45KT" denotes a 45-knot gust), as archived by the Iowa Environmental Mesonet (IEM) for station NZWN in network NF__ASOS ("New Zealand ASOS"). Gust speed is converted from knots using 1 kt = 1.852 km/h, rounded half-up to the nearest whole number. Because gusts are reported in whole knots, no observed gust converts to a value on a bracket boundary, so every observation maps to exactly one range.
The month's highest gust can be located via the IEM Data Calendar for NZWN: https://mesonet.agron.iastate.edu/sites/hist.phtml?network=NF__ASOS&year=2026&month=9&mode=monthly&station=NZWN. Each calendar day displays that day's peak gust inline; clicking a day's date opens the daily Summary for NF__ASOS, where the Peak Gust column in the NZWN (Wellington) row shows the day's maximum. Ensure station NZWN is selected, as the NF__ASOS network includes other New Zealand stations. Note that the IEM calendar and summary pages display gusts in mph; resolution is based on the knot value in the underlying raw METAR, which IEM archives alongside each parsed observation and which can be used to independently verify any value.
If any observations are missing or unavailable, this market will resolve to the range containing the highest gust reported during the resolution window. Should the IEM archive be unavailable or discontinued, this market will resolve based on the equivalent raw METAR/SPECI observations for NZWN from another credible archive or the original reporting authority.
Wellington, New Zealand, experiences peak September gusts shaped by its location in the Roaring Forties and the funneling effect of Cook Strait, where westerly and northerly flows accelerate over exposed terrain. Spring climatology drives rising average wind speeds through the month, with historical records showing frequent gusts exceeding 90–100 km/h at sites like Wellington Aero and Mt. Kaukau amid frontal passages and low-pressure systems. Current trader balance near 50% across thresholds reflects uncertainty in whether a strong synoptic event—potentially enhanced by lingering El Niño influences or neutral Southern Annular Mode conditions—will push extremes above 102 km/h or keep them in the 90–101 km/h range, as model guidance and early-month observations remain variable.
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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