September at Toko Mouth averaged 9.1°C and delivered 105 mm of rain, with no frosts, light winds and one big pressure swing mid-month.
Temperature
Days averaged a high of 14.4°C and a low of 5.0°C. Twelve days reached 15°C or more, and only two stayed below 10°C. The warmest readings came on two standout afternoons: 22.3°C on the 15th and 22.1°C on the 21st. The coldest nights dipped to 1.9°C (the 1st and 23rd), so the station never reached freezing this month.
Rain
105 mm fell over the month, with 19 days recording at least 1 mm and just six essentially dry. The second half was wetter (about 64 mm versus 41 mm in the first fortnight). The wettest day was the 27th with 13.9 mm, followed by the 16th (11.6 mm), the 20th (9.5 mm) and the 4th (9.1 mm). The heaviest burst of rain was 7.2 mm/hr on the evening of the 4th.
Wind and pressure
It was a gentle month: the average wind speed was only 5.7 km/h and the strongest gust was 37.4 km/h on the morning of the 21st. That same day humidity fell to 35% around midday as the temperature climbed to 22°C, the driest reading of the month.
Pressure did the real work. It bottomed out at 984.1 hPa on the afternoon of the 19th (after 985.9 on the 4th), then rebuilt to a high of 1030.0 hPa on the evening of the 23rd, a settled, sunny spell that also produced the month’s peak UV index of 8.
Data: Toko Mouth Ecowitt GW2000 station (WS90 and WH25 sensors), 4-hourly export, 1–30 September 2026.
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