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Weather by month

American Samoa weather, month by month

Last verified NOAA 1991–2020 normalsPacific/Pago Pago time
Average highs, lows, rain, snow and daylight for every month. Measured at the Pago Pago Wso AP (12 ft, 4 mi from Visitor Center and Park Store).
Mar high
88°F
hottest month
Aug low
77°F
coldest month
Rain + snowmelt
128.3in / yr
wettest: Jan
Snowfall
0.0in / yr
rare
Days ≥ 90°F
42/ yr
Nights ≤ 32°F
0/ yr

Pago Pago Wso AP

Month by month

Normals are 30-year averages (1991–2020). Crowds = each month’s share of the park’s busiest month, from NPS visitor counts. Sunrise and sunset are for the 15th of each month in 2027.
Average high and low, every monthbars run from the low to the high · tan strip = precipitation
comfortable highs 55–85°F80°January: average high 88°F, low 78°F, 15.3 in precipitation88°78°January: 15.3 in precipitationJFebruary: average high 88°F, low 78°F, 13.7 in precipitation88°78°February: 13.7 in precipitationFMarch: average high 88°F, low 78°F, 10.9 in precipitation88°78°March: 10.9 in precipitationMApril: average high 88°F, low 78°F, 11.3 in precipitation88°78°April: 11.3 in precipitationAMay: average high 86°F, low 78°F, 11.7 in precipitation86°78°May: 11.7 in precipitationMJune: average high 85°F, low 78°F, 6.4 in precipitation85°78°June: 6.4 in precipitationJJuly: average high 85°F, low 77°F, 7.5 in precipitation85°77°July: 7.5 in precipitationJAugust: average high 85°F, low 77°F, 6.9 in precipitation85°77°August: 6.9 in precipitationASeptember: average high 86°F, low 78°F, 8.0 in precipitation86°78°September: 8.0 in precipitationSOctober: average high 86°F, low 78°F, 10.2 in precipitation86°78°October: 10.2 in precipitationONovember: average high 87°F, low 78°F, 12.1 in precipitation87°78°November: 12.1 in precipitationNDecember: average high 88°F, low 78°F, 14.3 in precipitation88°78°December: 14.3 in precipitationDrain
MonthHighLowRainWet daysSunriseSunsetDaylightCrowds
Jan88°78°15.3″246:03 AM6:55 PM12h 52m35
Feb88°78°13.7″226:17 AM6:50 PM12h 33m62
Mar88°78°10.9″246:23 AM6:34 PM12h 11m50
Apr88°78°11.3″226:26 AM6:13 PM11h 47m100
May86°78°11.7″216:32 AM6:00 PM11h 27m32
Jun85°78°6.4″196:41 AM5:59 PM11h 17m14
Jul85°77°7.5″206:45 AM6:06 PM11h 22m76
Aug85°77°6.9″196:35 AM6:13 PM11h 38m24
Sep86°78°8.0″186:14 AM6:15 PM12h 01m78
Oct86°78°10.2″215:53 AM6:17 PM12h 24m45
Nov87°78°12.1″215:41 AM6:27 PM12h 46m35
Dec88°78°14.3″245:46 AM6:43 PM12h 58m17

Sweet spot: August combines average highs between 55°F and 85°F with crowds under 60% of the peak month. Check what is open in those months — quiet can also mean closed roads.

How to read this

These are NOAA’s official 1991–2020 climate normals for one weather station, not a model of the whole park. The station is the one with complete temperature and precipitation normals nearest to a visitor center. Highs and lows are daily averages for the month; “wet days” are days with at least 0.01 inch of precipitation. Mountain parks can be 10–20 °F cooler at their high points than at the station, and the NPS weather page for American Samoa is the place for current conditions and seasonal closures.

Sunrise and sunset are computed with the NOAA solar equations for the park’s coordinates and shown in Pacific/Pago Pago time for the 15th of each month of 2027; they are accurate to about a minute.

Sources · 3

  1. 1.U.S. Climate Normals 1991–2020 — monthly normals station inventory · National Centers for Environmental Information (NOAA)
  2. 2.National Park of American Samoa — Weather (nps.gov) · National Park Service
  3. 3.National Park of American Samoa — Visitor Use Statistics · National Park Service (IRMA)

FAQ

American Samoa weather questions

What is the hottest month at American Samoa?
March, with an average high of 88°F and an average low of 78°F at Pago Pago Wso AP (NOAA 1991–2020 normals). The station averages 42 days a year at or above 90°F.
How cold does American Samoa get in winter?
August is the coldest month, averaging a low of 77°F and a high of 85°F at Pago Pago Wso AP. Freezing nights are rare at this station.
Does it snow at American Samoa?
Pago Pago Wso AP records almost no snowfall (0.0 inches a year). Higher elevations in the park can differ.
When is the rainy season at American Samoa?
January is the wettest month on average (15.3 inches of precipitation at Pago Pago Wso AP); the station's annual total is 128.3 inches.
How many hours of daylight does American Samoa get?
About 11h 17m on June 15 and 12h 58m on December 15 (sunrise 6:41 AM, sunset 5:59 PM in June; 5:46 AM to 6:43 PM in December, Pacific/Pago Pago time).
What is the best month to visit American Samoa for weather?
By NOAA's normals, average highs sit between 55°F and 85°F in July and August. Of those, August is also well below the park's peak crowds. Weather in the park varies with elevation; this is the Pago Pago Wso AP station.

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