American Samoa's Tropical Cyclone Outlook 2025-26

Below Normal to Near Normal Tropical Cyclone (TC) Activity anticipated for American Samoa in the 2025-26 TC Season Read More >

717
FXZS60 NSTU 140133
AFDPPG

Area Forecast Discussion
National Weather Service Pago Pago AS
233 PM SST Fri Mar 13 2026

.Short term...

Satellite imagery showed a trough was over American Samoa last
night moved south by this morning. More sun than clouds were
observed throughout the day today with late morning rainfall
recorded on the far western end of Tutuila. Weak easterly flow is
now over the territory. This led to hot weather throughout the
day with the National Park Service weather station at Siufaga
Ridge reaching 90 degrees and the ASPA/UH weather station at
Aunu`u reaching 91 degrees.

Overall, below normal rainfall and warmer than average
temperatures are forecast this weekend. A weak ridge from the
south is forecast to keep a developing trough to the north and
west of Swains this weekend. This will lead to a fair mix of sun
and clouds with a chance of passing showers. Otherwise, easterly
trade winds are to increase slightly on Saturday night through
Monday, but only up to around 15 mph which is well below Wind
Advisory levels.

.Long term...

For next week, there are no indications of severe weather
developing over the islands. Drier than average air is to remain
over the region with the chance of passing showers throughout this
time. Temperatures, once again, are forecast to be above average
and easterly trades decrease throughout the week.

There is no risk of tropical development near American Samoa for
the next 7 days.

&&

.Marine...

As winds decreased to a gentle easterly breeze with weakening
northerly swell today, seas have eased to around 5 to 6 feet at
the PacIOOS buoy to the east of Aunu`u and around 4 to 5 feet for
their buoy to west of Tutuila. However, a southerly swell is
anticipated to begin moving through the American Samoa coastal
waters on Saturday. This is forecast to build seas this weekend.
Even though seas aren`t expected to be choppy due to the gentle
breeze on Saturday, surf is forecast to elevate to at least near
High Surf Advisory levels throughout the day. On Sunday, easterly
trades increase to 10 to 15 knots to bring a light chop to the
seas along with the long period swell. By Sunday evening, seas are
to ease below Small Craft Advisory levels as the swell weakens.
Ideal conditions are forecast for the beginning to middle of next
week with a gentle easterly breeze and seas around 4 to 6 feet.

&&

.PPG WATCHES/WARNINGS/ADVISORIES...

NONE

&&

$$

LaPlante