September weather forecastHoniara, Solomon Islands
September
Weather in September
September signals a gradual increase in temperature, indicating the transition from winter to summer. The sea temperature experiences a similar rise, again making it a magnet for water sports enthusiasts. An increase in rainfall to 162mm (6.38") from August has been observed, indicating the onset of wetter months. Still, the climate remains favorable for outdoor activities due to moderate weather conditions. The continued gusty winds and warm ocean waters make windsurfing and sailing popular activities.Temperature
As September unfolds, the average high-temperature reaches a still warm 28.5°C (83.3°F), hinting at a slight fluctuation from the previous month. Honiara cools down to an average low-temperature of 23.4°C (74.1°F) throughout the month of September.Heat index
Throughout September, the heat index is evaluated at a tropical 34°C (93.2°F). Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.Evaluating the heat index requires understanding its values in the shade and with gentle winds. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', gives a temperature feeling by integrating air temperature and humidity. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. Consider that direct sun exposure can intensify the felt heat, adding potentially 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are extremely vital to babies and toddlers. Children frequently underestimate the importance of resting and drinking fluids. Thirst is a symptom of advanced dehydration - hence the need to hydrate regularly, especially during protracted physical exercises.
Humidity
The 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. Throughout the year, there are 327.8 rainfall days, and 2474mm (97.4") of precipitation is accumulated.Sea temperature
In Honiara, the average seawater temperature in September is 28.8°C (83.8°F).Note: Swimming, diving, and other water-related activities in temperatures between 25°C (77°F) and 29°C (84.2°F) are considered highly enjoyable and satisfying for longer durations without uneasiness.
Daylight
In September, the average length of the day is 12h and 3min.On the first day of the month, sunrise is at 06:22 and sunset at 18:18. On the last day of September, sunrise is at 06:04 and sunset at 18:15 +11.
Sunshine
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, Solomon Islands. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily high UV index of 7 during September translates into the following recommendations:
Use measures and accept sun safety conventions. Guarding against skin and eye trauma is of high priority. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Beware! Reflecting off water and sand, UV rays are much stronger.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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%
The months with the highest relative humidity are January, March and April (85%).
The 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
The 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: 12h and 6min
The month with the longest days is December (Average daylight: 12h and 42min).
The month with the shortest days is June (Average daylight: 11h and 36min).
- Average sunshine in September: 8h and 0min
The month with the most sunshine is November (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 6h and 48min).
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
The months with the highest UV index are April, May, July and September (UV index 7).
The 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
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
