Wellington, New Zealand, experiences peak September gusts shaped by its position in the Roaring Forties, where westerly flow funnels and accelerates through Cook Strait amid steep topography. Early-month observations show moderate fresh breezes with gusts near 50–60 km/h, while a strong El Niño episode is expected to sustain enhanced pressure gradients and more frequent strong westerlies through spring. This setup creates near-even market odds around the 90–102 km/h thresholds because seasonal models diverge on whether transient lows or fronts will deliver isolated extreme events exceeding 102 km/h or remain within the more common 90–101 km/h range typical of historical spring maxima. Upcoming NIWA and MetService forecast updates through mid-September will clarify intensification potential.
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 50%
89 km/h or below 49%
89 km/h or below
49%
90 to 101 km/h
50%
102 km/h or above
51%
102 km/h or above 51%
90 to 101 km/h 50%
89 km/h or below 49%
89 km/h or below
49%
90 to 101 km/h
50%
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 position in the Roaring Forties, where westerly flow funnels and accelerates through Cook Strait amid steep topography. Early-month observations show moderate fresh breezes with gusts near 50–60 km/h, while a strong El Niño episode is expected to sustain enhanced pressure gradients and more frequent strong westerlies through spring. This setup creates near-even market odds around the 90–102 km/h thresholds because seasonal models diverge on whether transient lows or fronts will deliver isolated extreme events exceeding 102 km/h or remain within the more common 90–101 km/h range typical of historical spring maxima. Upcoming NIWA and MetService forecast updates through mid-September will clarify intensification potential.
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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