Savai'i (Savaii) weather in September
September in Savai'i: warm, rainy, with clean air — fine if you can take 23 rainy days.
Updated September 2026 · climate normals from ERA5 reanalysis
#1 of 12 months in Savai'i · #402 of 1413 destinations to visit in September · comfort 87/100 (tier A)
- Days
- 22°C
- Nights
- 18°C
- Wet days
- 23
- Sun
- 10.8 h
- Humidity
- 86%
- Daylight
- 12 h
Traveller notes on Savai'i in September
Forum posters describe September as sitting outside Samoa's full wet season (October through April), meaning tropical showers are still likely but generally not severe enough to disrupt a trip, with sunshine and warmth typically dominating. Posters do flag Savai'i specifically as prone to rain more or less regardless of season, though usually not heavy - a real contrast to the somewhat drier reputation of the more developed Upolu. Posters note weather can differ meaningfully between the north and south coasts and between islands, and describe Samoa's weather generally as becoming less predictable in recent years, with one visitor reporting a run of hot September days interrupted by an unexpected mini-cyclone.
Other months in Savai'i
Samoa's forum is direct that Savai'i runs wetter than neighboring Upolu, and rain is a real possibility here pretty much year-round even if it's rarely heavy. March sits near the tail end of the rainy season, with posters describing a pattern of showers more likely in the early morning and evening, leaving the middle of the day drier - though heavier overnight rain is still possible. Regulars recommended packing a raincoat as routine gear rather than a special precaution, since most rain here comes in short bursts that don't really derail a day's plans.
Add your own note from Savai'i's card on the map.
Savai'i climate normals — September
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Savai'i in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusyTeuila Festival, Apia, school holidays in 3 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Savai'i's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Best weatherSavai'i's best weather comes in June, August and September — separate windows, not one continuous season.
September includes Humpback whales offshore.
Best weatherFair weatherToughest weather
What's on in Savai'i in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
South-coast surf season
1 May – 31 Oct · usuallySouthern Ocean swells reach the south coast through the southern winter, with Aganoa and the reef passes near Satuiatua the best-known breaks. Most are reef breaks for experienced surfers; mornings are glassier before the trade winds. Source ↗
- Nature
Humpback whales offshore
1 Jul – 31 Oct · usuallyWhale seasonHumpbacks from the Oceania population pass through Samoan waters in the southern winter and are sometimes seen from the south coast. Numbers are far lower than in Tonga, so treat a sighting as a bonus, not a plan. Source ↗
- Festival
Teuila Festival, Apia
30 Aug – 8 Sep · usuallyMajor festivalCrowdedBook earlySamoa's national culture festival fills Apia for a week with fire-knife dancing, fautasi longboat races, siva and a float parade. From Savai'i it means the ferry to Upolu and the drive into town, so stay over rather than day-trip. Source ↗
Where is Savai'i?
Savai'i in September — FAQ
- Is September a good time to visit Savai'i?
- September in Savai'i: warm, rainy, with clean air — fine if you can take 23 rainy days. It ranks #1 of 12 months for Savai'i on SeasonMap's comfort score (87/100).
- What is the weather like in Savai'i in September?
- In September, Savai'i averages a daily high of 22°C and a low of 18.1°C, with about 106.2 mm of rain over roughly 22.5 rainy days.
- What is the air quality in Savai'i in September?
- Savai'i has a mean US Air Quality Index of about 27 in September.