September weather forecast and climate
Honiara, Solomon Islands

A tropical white sand beach in Honiara, in the glorious Solomon Islands, with palm trees and shrubs along the edge
A tropical white sand beach in Honiara, in the glorious Solomon Islands, with palm trees and shrubs along the edge
September, the first month of the spring, in Honiara, is still a warm month, with average temperature ranging between min 23.4°C (74.1°F) and max 28.5°C (83.3°F).

Temperature

In Honiara, the average high-temperature in September is almost the same as in August - a still warm 28.5°C (83.3°F). The average low-temperature, in September, is 23.4°C (74.1°F).

Heat index

The average heat index in September is estimated at a tropical 34°C (93.2°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'apparent temperature', or 'feels like', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is individual, with diverse people perceiving weather differently for numerous reasons (metabolic differences, differences in body mass, height, and shape, pregnancy), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

Months with the lowest humidity are August through November, with an average relative humidity of 83%.

Rainfall

In September, the rain falls for 26 days. Throughout September, 162mm (6.38") of precipitation is accumulated. In Honiara, during the entire year, the rain falls for 327.8 days and collects up to 2474mm (97.4") of precipitation.

Sea temperature

In September, the average sea temperature in Honiara is 28.8°C (83.8°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

In Honiara, the average length of the day is 12.1h.

Sunshine

In Honiara, the average sunshine in September is 8h.

UV index

April, May, July and September, with an average maximum UV index of 7, are months with the highest UV index in Honiara. A UV Index value of 6 to 7 symbolizes a high health risk from the exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 7 interpret into the following advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the temperature in September in Honiara?

The average high-temperature, in September, in Honiara, Solomon Islands, is 28.5°C (83.3°F), while the average low-temperature is 23.4°C (74.1°F). The average heat index (a.k.a. 'real feel', 'apparent temperature'), that combines air temperature and relative humidity, in September is calculated to 34°C (93.2°F).

What is the least humid month in Honiara?

Months with the lowest humidity are August through November, with an average relative humidity of 83%.

What is the average humidity in September in Honiara?

In September, the average relative humidity in Honiara, Solomon Islands, is 83%.

How many days does it rain in September in Honiara?

In September, the rain falls for 26 days. Throughout September, 162mm (6.38") of precipitation is accumulated.

How warm is the water in September in Honiara?

In Honiara, the average seawater temperature in September is 28.8°C (83.8°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

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

In Honiara, the average length of the day in September is 12.1h.

How long on average sun shines in September in Honiara?

In September, the average sunshine is 8h.

When is the highest UV index in Honiara?

Months with the highest UV index in Honiara, Solomon Islands, are April, May, July and September, with an average maximum UV index of 7.

What is the UV index intensity in September in Honiara?

In September, the average daily maximum UV index in Honiara is 7. A UV Index estimate of 6 to 7 represents a high health risk from the exposure to the Sun's UV radiation.
Average temperature in September - Honiara, Solomon Islands
  • Average high temperature in September: 28.5°C

The warmest month (with the highest average high temperature) is December (29.3°C).
The month with the lowest average high temperature is July (27.8°C).

  • Average low temperature in September: 23.4°C

The month with the highest average low temperature is January (24.2°C).
The coldest months (with the lowest average low temperature) are August and September (23.4°C).

Average pressure in September - Honiara, Solomon Islands
  • Average pressure in September: 1010.4mbar

The month with the highest atmospheric pressure is August (1010.5mbar).
The month with the lowest atmospheric pressure is January (1006.9mbar).

Average wind speed in September - Honiara, Solomon Islands
  • Average wind speed in September: 9.9km/h

The windiest month (with the highest average wind speed) is July (11.3km/h).
The calmest month (with the lowest average wind speed) is December (6km/h).

Average humidity in September - Honiara, Solomon Islands
  • Average humidity in September: 83%

Months with the highest relative humidity are January, March and April (85%).
Months with the lowest relative humidity are August, September, October and November (83%).

Average rainfall in September - Honiara, Solomon Islands
  • Average rainfall in September: 162mm

The wettest months (with the highest rainfall) are March and December (299mm).
The driest month (with the least rainfall) is June (125mm).

Average rainfall days in September - Honiara, Solomon Islands
  • Average rainfall days in September: 26 days

Months with the highest number of rainy days are January, March and December (29.3 days).
The month with the least rainy days is August (24.3 days).

Average sea temperature in September - Honiara, Solomon Islands
  • Average sea temperature in September: 28.8°C

The best month for swimming (with the highest average sea temperature) is April (30.3°C).
The coldest month (with the lowest average sea temperature) is August (28.6°C).

Average daylight in September / Average sunshine in September - Honiara, Solomon Islands
  • Average daylight in September: 12.1h

The month with the longest days is December (Average daylight: 12.7h).
Months with the shortest days are June and July (Average daylight: 11.6h).

  • Average sunshine in September: 8h

The month with the most sunshine is November (Average sunshine: 9.7h).
The month with the least sunshine is January (Average sunshine: 6.8h).

Average sunshine days in September - Honiara, Solomon Islands
  • Average sunshine days in September: 2.4 days

The month with the most sunshine days is August (4 days).
The month with the least sunshine days is January (0.3 days).

Average UV index in September - Honiara, Solomon Islands
  • Average UV index in September: 7

Months with the highest UV index are April, May, July and September (UV index 7).
Months with the lowest UV index are January, February, March, June, August, October, November and December (UV index 6).

Average cloud cover in September - Honiara, Solomon Islands
  • Average cloud cover in September: 44

The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is May (Cloud cover 41).

Average visibility in September - Honiara, Solomon Islands
  • Average visibility in September: 9km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).