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Alotau Weather in September
Alotau in September sees high temperatures, with highs around 28°C (82°F) and overnight lows of 22°C (72°F). With the rainy season in full effect, expect around 215 mm (8.5 in) of rainfall and regular showers throughout the month.
Rainfall in Alotau in September
As part of the rainy season, Alotau sees around 14 days of rain in September, with an average of 215 mm (8.5 in). Showers during the rainy season tend to be heavy and can come down intensely. An umbrella is often not enough, so a poncho or waterproof jacket is a better choice.
Temperature in Alotau in September
If you're visiting Alotau in September, expect highs of 28°C (82°F) and overnight lows around 22°C (72°F). Overall, the month follows a fairly predictable daily temperature pattern. Nights are mild at around 22°C (72°F), which is comfortable for most people.If your ideal day consists of dry skies and pleasant temperatures, July and August typically offer the best circumstances for Alotau.
Alotau Temperature in September
Min Temperature
22°C (72°F)
Max Temperature
28°C (82°F)
Chance of Rain
45%
Precipitation
215 mm (8.5 in)
Rainy days
14 days
Humidity
82% *
* Data from: Sideia, Papua New Guinea (42 KM, 26 Miles).
Alotau Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Alotau - and find the best time to visit.
Historical weather records for Alotau in September
Browse day-by-day weather records for Alotau spanning 26 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Alotau historical weather extremes in September
The extremes listed below come from historical weather data collected in Alotau from 2004 through 2026.
- The warmest day in September was on September 5, 2022, with a maximum of 32°C (90°F).
- On September 29, 2004, Alotau saw its coldest September day with temperatures maxing out at 21°C (70°F).
- Nighttime temperatures dropped to 19°C (66°F) on September 10, 2026, marking the coldest September night on record.
Best Places in Papua New Guinea in September
Find out more about the weather in Papua New Guinea and which places have the best travel conditions in this month. See all of Papua New Guinea in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Alotau in September
Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything!
What To Do in Alotau in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling7/10 -
Walking7/10 -
Camping6/10 -
Outdoor sports7/10
Alotau 3-Day Forecast
More climate data for Alotau
See the full Alotau climate overview or explore weather in Papua New Guinea.
Popular in September
Where to go in September - average daytime high across popular destinations.
Rabaul
29°C (84°F) Madang30°C (86°F) Port Moresby
30°C (86°F) Kokopo29°C (84°F) Alotau28°C (82°F) Lae27°C (81°F) Goroka24°C (75°F) Mount Hagen22°C (72°F) Bucket list
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