Hagåtña weather in September
September in Hagåtña: sweltering, soaked, with clean air — a gamble, with 23 rainy days.
Updated September 2026 · climate normals from ERA5 reanalysis
#11 of 12 months in Hagåtña · #1169 of 1413 destinations to visit in September · comfort 58/100 (tier D)
- Days
- 31°C
- Nights
- 25°C
- Wet days
- 23
- Sun
- 8.7 h
- Humidity
- 83%
- Daylight
- 12 h
Traveller notes on Hagåtña in September
Guam forum regulars, including at least one longtime resident, describe September rain as more of a nuisance than a trip-wrecker: most showers last just a few minutes, often happen at night, and the handful of afternoon ones that do occur usually blow through within minutes. That's despite September sitting in the wettest, most typhoon-exposed stretch of the year (July through November). The heat and humidity are the bigger factor day to day - it rarely drops much below 75F even overnight - so most visitors plan around the mugginess rather than the rain itself.
Other months in Hagåtña
Forum posters place March within Guam's dry season (December-March), well clear of the main rainy stretch that runs roughly late June through October/November. Typical temperatures run mid-80sF, and even on days that do bring rain, posters say it tends to hold off until evening, leaving daytime hours mostly sunny for beach time and sightseeing. December through March is consistently named the best overall window to visit, prized specifically for avoiding both the heavier rain and the typhoon risk that builds through the second half of the year.
Add your own note from Hagåtña's card on the map.
Hagåtña climate normals — September
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Hagåtña 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.
Quietschool holidays in 3 of the markets that fill it, one of its worst months for weather(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Hagåtña'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).
Toughest weatherHagåtña's weather peaks February–April, best around March.
September coincides with Typhoon season.
Best weatherFair weatherToughest weather
What's on in Hagåtña in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Hazard
Typhoon season
1 Jun – 30 Nov · usuallyStorms can cross Guam in any month, but most western Pacific systems form between June and November and the island is squarely in the track. Concrete construction here is a response to that, not a style. Source ↗
- Season
Wet season
MonsoonRisk23 rainy days and about 414 mm in the month — the real kind of rainy season, not afternoon showers.
from the climate normals
Nearby, and something's on
Within 300 km of Hagåtña — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Hagåtña?
Hagåtña in September — FAQ
- Is September a good time to visit Hagåtña?
- September in Hagåtña: sweltering, soaked, with clean air — a gamble, with 23 rainy days. It ranks #11 of 12 months for Hagåtña on SeasonMap's comfort score (58/100).
- What is the weather like in Hagåtña in September?
- In September, Hagåtña averages a daily high of 31.3°C and a low of 25.4°C, with about 414.2 mm of rain over roughly 22.8 rainy days.
- What is the air quality in Hagåtña in September?
- Hagåtña has a mean US Air Quality Index of about 27 in September.
Within 300 km: Saipan's Green turtle nesting around 1 May – 30 Nov.