Honiara Weather in September
What's the weather like in Honiara (Guadalcanal) in September 2025?
The climate in Honiara during September can be summarized as hot, humid and damp.
September is in the spring in Honiara and is typically the 6th coldest month of the year. Daytime maximum temperatures average around a steamy 30°C (87°F), whilst at night 22°C (72°F) is normal.
| Daytime temperature | 30.3°C 86.5°F |
|---|---|
| Nightly temperature | 22.1°C 71.8°F |
| Average temperature | 26.2°C 79.2°F |
| Daily sunshine | 6.2 hrs |
| Avg rainfall | 114 mm 4.5 ins |
| Rainy days | 14 days |
| Sea temperature | 28.5°C 83.2°F |
| Humidity | 77% |
| Windspeed | 4.7kph 3 mph |
On average September is the 3rd driest month of the year in Honiara with around 114mm 4.5 inches of rain making it a damp time to visit. This rainfall is typically spread over 14 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.2 hours of sunshine per day.
September temperatures in Honiara
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Honiara in September 2025.
Other monthly averages
Best places to visit in September
Honiara weather stats
| Hottest month: | January | 30.3°C 86.5°F |
|---|---|---|
| Driest month: | June | 100mm 3.9ins |
| Sunniest month: | August | 6.3hrs |
| Coldest month: | July | 29.1°C 84.4°F |
| Wettest month: | March | 331mm 13ins |
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