Honiara Weather in September

With daytime temperatures of 28°C (82°F) and nighttime lows of 24°C (75°F), September in Honiara brings high temperatures during the day. Do keep in mind that September is part of the rainy season, with frequent and often heavy rainfall.

Rainfall in Honiara in September

As part of the rainy season, Honiara sees around 15 days of rain in September, with an average of 223 mm (8.8 in). The rain this month falls heavily when it arrives. Late afternoons in particular can see strong showers, so waterproofs are worth keeping handy.

Temperature in Honiara in September

September in Honiara brings high temperatures, with highs of 28°C (82°F) and nights around 24°C (75°F). Overall, the month follows a fairly predictable daily temperature pattern. With overnight lows of 24°C (75°F), evenings and nights remain warm. Light clothing and an open window or fan can help you sleep comfortably.

Sunshine in Honiara in September

Expect sunny days throughout the month, with an estimated 193 hours of sunshine. Despite being the rainy season, it could still be a nice time to visit. Rain often arrives later in the day, keeping most of the days sunny.

Average water temperature in September

With water at 28°C (82°F), you can expect warm, pleasant conditions for any water activity. There's no adjustment period — it feels comfortable straight away.

If you prefer dry days with pleasant temperatures, June and August typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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• February
• March
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• May
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For a detailed overview over the year and the best time to visit Solomon Islands, check out our Honiara's climate page.

Honiara Temperature in September

Min Temperature 24°C (75°F)  

Max Temperature 28°C (82°F)  

Water Temperature 28°C (82°F)  

Chance of Rain 48%  

Precipitation 223 mm (8.8 in)  

Rainy days 15 days  

Humidity 73%  

Sunshine 193 hours  

Percentage Sunshine  

Daily Historical Temperatures

48-year average (1976-2025)

Based on our historical records, temperatures in Honiara typically stay consistent throughout September, with daily highs averaging around 28°C (82°F). Nights are warm, with lows around 23°C (73°F).

Average temperatures in September

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Daily Historical Precipitation

48-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Historical weather for Honiara in September

Browse day-by-day weather records for Honiara spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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Honiara historical weather extremes in September

Based on 21 years of weather observations (2004-2025), these are the most extreme conditions recorded in Honiara.

• The hottest September day on record in Honiara reached 36°C (97°F) (September 15, 2021).
• Honiara experienced its chilliest September day on September 15, 2005, reaching only 25°C (77°F).
• The coldest night in September in Honiara was on September 4, 2013, with a minimum of 19°C (66°F).
• The heaviest September precipitation occurred on September 1, 2019, when 80 mm (3.1 in) of precipitation fell.

What to Wear in Honiara in September

Warm but pleasant conditions in Honiara in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. The water temperature sits at about 28°C (82°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Honiara in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

7/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Solomon Islands, check out our Honiara's climate page.

More climate data for Honiara

Temperature Rainfall Sunshine Humidity Water Temp

See the full Honiara climate overview or explore weather in Solomon Islands.