Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
September
Weather in September
Temperature
The average high-temperature for September is a still fresh 12.5°C (54.5°F), closely aligning with the temperature of the preceding month. A consistent average low of 9.6°C (49.3°F) is noted throughout September, only a small step down from its daytime high.Humidity
The average relative humidity in September is 79%.Rainfall
In September, in Island Bay, the rain falls for 13 days. Throughout September, 25mm (0.98") of precipitation is accumulated. In Island Bay, New Zealand, during the entire year, the rain falls for 144.3 days and collects up to 394mm (15.51") of precipitation.Daylight
In September, the average length of the day in Island Bay is 11h and 49min.On the first day of September in Island Bay, sunrise is at 6:45 am and sunset at 5:56 pm NZST. On the last day of the month, sunrise is at 6:56 am and sunset at 7:25 pm NZDT.
Note: On Sunday, 29. September 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from NZST to NZDT. Daylight Saving Time lasts until Sunday, 06. April 2025, at 3:00 am; consequently, the time zone reverts from NZDT to NZST.
Sunshine
The average sunshine in September in Island Bay is 7.5h.UV index
In September, the average daily maximum UV index in Island Bay is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: In September, the maximum UV index of 4 suggests these recommendations:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Island Bay?
What is the average humidity in September in Island Bay?
How many days does it rain in September in Island Bay?
How many hours of daylight does Island Bay have in September?
When is the sunrise / sunset in September in Island Bay?
When does Daylight Saving Time (DST) start in September in Island Bay?
How many hours of sunshine does Island Bay have in September?
What is the UV index reading in September in Island Bay?
Average temperature in September
Island Bay, New Zealand
- Average high temperature in September: 12.5°C
The warmest month (with the highest average high temperature) is February (18.8°C).
The month with the lowest average high temperature is July (11.4°C).
- Average low temperature in September: 9.6°C
The month with the highest average low temperature is February (15.4°C).
The coldest month (with the lowest average low temperature) is July (9°C).
Average pressure in September
Island Bay, New Zealand
- Average pressure in September: 1012.2mbar
The month with the highest atmospheric pressure is March (1017.7mbar).
The months with the lowest atmospheric pressure are September and November (1012.2mbar).
Average wind speed in September
Island Bay, New Zealand
- Average wind speed in September: 26.9km/h
The windiest month (with the highest average wind speed) is September (26.9km/h).
The calmest month (with the lowest average wind speed) is March (23.1km/h).
Average humidity in September
Island Bay, New Zealand
- Average humidity in September: 79%
The months with the highest relative humidity are February, March, April and December (80%).
The month with the lowest relative humidity is July (78%).
Average rainfall in September
Island Bay, New Zealand
- Average rainfall in September: 25mm
The wettest month (with the highest rainfall) is June (47mm).
The driest months (with the least rainfall) are January and February (20mm).
Average rainfall days in September
Island Bay, New Zealand
- Average rainfall days in September: 13 days
The month with the highest number of rainy days is June (14.5 days).
The month with the least rainy days is February (8 days).
Average daylight in September /
Average sunshine in September
Island Bay, New Zealand
- Average daylight in September: 11h and 5min
The month with the longest days is December (Average daylight: 15h and 6min).
The month with the shortest days is June (Average daylight: 9h and 12min).
- Average sunshine in September: 7h and 3min
The month with the most sunshine is December (Average sunshine: 9h and 24min).
The month with the least sunshine is June (Average sunshine: 5h and 24min).
Average sunshine days in September
Island Bay, New Zealand
- Average sunshine days in September: 14.3 days
The month with the most sunshine days is March (19 days).
The month with the least sunshine days is June (11.5 days).
Average UV index in September
Island Bay, New Zealand
- Average UV index in September: 4
The months with the highest UV index are January, February, March and December (UV index 5).
The months with the lowest UV index are May and June (UV index 3).
Average cloud cover in September
Island Bay, New Zealand
- Average cloud cover in September: 38
The month with the most cloud cover is June (Cloud cover 44).
The month with the least cloud cover is February (Cloud cover 30).
Average visibility in September
Island Bay, New Zealand
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
