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 snowfall in September
- Average snowfall 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
Irwell starts September with an average high-temperature of a mild 13.2°C (55.8°F), hinting at a minimal fluctuation from August. In Irwell, an average low-temperature of 4.5°C (40.1°F) is recorded during September nights.Humidity
In Irwell, the average relative humidity in September is 78%.Rainfall
The month with the least rainfall in Irwell is September, when the rain falls for 8.2 days and typically collects 14mm (0.55") of precipitation.Snowfall
Months with snowfall in Irwell are June through September. September is the last month it regularly snows. During 0.1 snowfall days, in September, Irwell aggregates 3mm (0.12") of snow. In Irwell, during the entire year, snow falls for 1 days and aggregates up to 13mm (0.51") of snow.Daylight
In September, the average length of the day is 11h and 47min.On the first day of September in Irwell, sunrise is at 6:57 am and sunset at 6:03 pm NZST. On the last day of the month, sunrise is at 7:04 am and sunset at 7:36 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
In September, the average sunshine in Irwell is 7.6h.UV index
April through September, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: In September, an average UV index of 3 transforms into the following instructions:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Irwell in September?
What is the average humidity in September in Irwell?
What is the driest month in Irwell?
How much does it rain in Irwell in September?
What is the last month it snows in Irwell?
How many hours of daylight does Irwell have in September?
What time are sunrise and sunset in September in Irwell?
When does Daylight Saving Time (DST) start in September in Irwell?
How many hours of sunshine does Irwell have in September?
What is the month with the lowest UV index in Irwell?
How high is the UV index in September in Irwell?
Average temperature in September
Irwell, New Zealand
- Average high temperature in September: 13.2°C
The warmest month (with the highest average high temperature) is January (21.3°C).
The month with the lowest average high temperature is July (10.3°C).
- Average low temperature in September: 4.5°C
The month with the highest average low temperature is January (11.9°C).
The coldest month (with the lowest average low temperature) is July (3.8°C).
Average pressure in September
Irwell, New Zealand
- Average pressure in September: 1011mbar
The month with the highest atmospheric pressure is March (1016.9mbar).
The month with the lowest atmospheric pressure is November (1010.9mbar).
Average wind speed in September
Irwell, New Zealand
- Average wind speed in September: 13.8km/h
The windiest month (with the highest average wind speed) is January (15.3km/h).
The calmest month (with the lowest average wind speed) is August (12.4km/h).
Average humidity in September
Irwell, New Zealand
- Average humidity in September: 78%
The month with the highest relative humidity is June (81%).
The month with the lowest relative humidity is January (70%).
Average rainfall in September
Irwell, New Zealand
- Average rainfall in September: 14mm
The wettest month (with the highest rainfall) is October (38mm).
The driest month (with the least rainfall) is September (14mm).
Average rainfall days in September
Irwell, New Zealand
- Average rainfall days in September: 8.2 days
The month with the highest number of rainy days is October (12.5 days).
The month with the least rainy days is May (8 days).
Average snowfall in September
Irwell, New Zealand
- Average snowfall in September: 3mm
The month with the highest snowfall is August (5mm).
The months with the least snowfall are January, February, March, April, May, October, November and December (0mm).
Average snowfall days in September
Irwell, New Zealand
- Average snowfall days in September: 0.1 days
The months with the highest number of snowfall days are June and August (0.3 days).
The months with the least snowfall days are January, February, March, April, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Irwell, New Zealand
- Average daylight in September: 11h and 5min
The month with the longest days is December (Average daylight: 15h and 24min).
The month with the shortest days is June (Average daylight: 9h and 0min).
- Average sunshine in September: 7h and 4min
The month with the most sunshine is December (Average sunshine: 10h and 24min).
The month with the least sunshine is June (Average sunshine: 5h and 6min).
Average sunshine days in September
Irwell, New Zealand
- Average sunshine days in September: 20 days
The month with the most sunshine days is May (21.2 days).
The month with the least sunshine days is November (17.3 days).
Average UV index in September
Irwell, New Zealand
- Average UV index in September: 3
The month with the highest UV index is January (UV index 5).
The months with the lowest UV index are April, May, June, July, August and September (UV index 3).
Average cloud cover in September
Irwell, New Zealand
- Average cloud cover in September: 38
The month with the most cloud cover is June (Cloud cover 43).
The months with the least cloud cover are January, February, March and May (Cloud cover 37).
Average visibility in September
Irwell, New Zealand
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, June, July and December (10km).
The months with the lowest visibility are May, August, September, October and November (9km).
