Nelson
New Zealand
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Nelson, New Zealand

September, the first month of the spring, in Nelson, is also a moderate month, with average temperature fluctuating between 5.7°C (42.3°F) and 15°C (59°F).

Temperature

In Nelson, the average high-temperature in September is relatively the same as in August - a still moderate 15°C (59°F). In September, the average low-temperature is 5.7°C (42.3°F).

Humidity

In Nelson, New Zealand, the average relative humidity is 79.7%.

Rainfall

In Nelson, during September, the rain falls for 9.9 days and regularly aggregates up to 85.1mm (3.4") of precipitation. Throughout the year, there are 93.4 rainfall days, and 960.1mm (37.8") of precipitation is accumulated.

Sea temperature

July through October, with an average sea temperature of 14°C (57.2°F), are months with the coldest seawater. Swimming in 14°C (57.2°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

In September, the average length of the day is 11.8h.

Sunshine

In September, the average sunshine in Nelson is 6.3h.

UV index

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV radiation for the ordinary person.
In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Nelson?

In September, the average high-temperature is 15°C (59°F), and the average low-temperature is 5.7°C (42.3°F).

What is the average humidity in September in Nelson?

The average relative humidity in September is 79.7%.

How much does it rain in Nelson in September?

In Nelson, in September, it is raining for 9.9 days, with typically 85.1mm (3.4") of accumulated precipitation.

What months are the sea coldest in Nelson?

July through October, with an average sea temperature of 14°C (57.2°F), are months with the coldest seawater. At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

What is the water temperature in September in Nelson?

In September, the average sea temperature in Nelson, New Zealand, is 14°C (57.2°F). Swimming in 14°C (57.2°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the average length of the day in September in Nelson?

In Nelson, New Zealand, the average length of the day in September is 11.8h.

How many hours of sunshine does Nelson have in September?

In September, the average sunshine in Nelson, New Zealand, is 6.3h.

What is the UV index reading in September in Nelson?

In Nelson, New Zealand, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unprotected exposure to the UV radiation.
Average temperature in September - Nelson, New Zealand
  • Average high temperature in September: 15°C

The warmest month (with the highest average high temperature) is February (22.6°C).
The month with the lowest average high temperature is July (12.5°C).

  • Average low temperature in September: 5.7°C

The month with the highest average low temperature is February (13.3°C).
The coldest month (with the lowest average low temperature) is July (1.9°C).

Average humidity in September - Nelson, New Zealand
  • Average humidity in September: 79.7%

The month with the highest relative humidity is July (90%).
The month with the lowest relative humidity is November (73.7%).

Average rainfall in September - Nelson, New Zealand
  • Average rainfall in September: 85.1mm

The wettest month (with the highest rainfall) is June (92.7mm).
The driest month (with the lowest rainfall) is February (63.5mm).

Average rainfall days in September - Nelson, New Zealand
  • Average rainfall days in September: 9.9 days

The month with the highest number of rainy days is September (9.9 days).
The month with the lowest number of rainy days is February (5.8 days).

Average sea temperature in September - Nelson, New Zealand
  • Average sea temperature in September: 14°C

Best months for swimming (with the highest average sea temperature) are February and March (19°C).
Coldest months (with the lowest average sea temperature) are July, August, September and October (14°C).

Average daylight in September / Average sunshine in September - Nelson, New Zealand
  • Average daylight in September: 11.8h

The month with the longest days is December (Average daylight: 15.1h).
The month with shortest days is June (Average daylight: 9.2h).

  • Average sunshine in September: 6.3h

The month with most sunshine is January (Average sunshine: 8.6h).
The month with least sunshine is June (Average sunshine: 4.8h).

Average UV index in September - Nelson, New Zealand
  • Average UV index in September: 4

The month with the highest UV index is January (UV index 11).
Months with the lowest UV index are June and July (UV index 1).