yearsofweather

Guam in March:
hot, rain every other day

Guam · Records from 2006 to 2025. Not a forecast.

Mean high31°Hottest day 31.6° (2018)
Mean low24°Coldest night 22.2° (2014)
Rain days15 days8-26 by year
Rainfall91mmDaylight 11.9 → 12.2 h
Guam's 12 months iBest: December to February
Trip types Beach Finewarm sea and frequent rainSightseeing on foot Finehot, frequent rain and muggy
Humidity80%31 muggy days
Clear days8 days5 overcast days
Mean wind28 km/h11 windy days
Sea temperature28.1°27.5-28.5° by year (last 6)
Sunrise / sunset (15th)06:29 / 18:32Daylight 11.9 → 12.2 h

Guam in March

This is one of the drier months of the year, so there is less to worry about, though showers still pass. The first Monday of March is Guam History and Chamorro Heritage Day, formerly Discovery Day, a territorial holiday, with a festival in the village of Umatac. The sun is strong, so bring a hat.

Highs averaged 31°C and lows stayed at 24°C, so the heat hung on long after sunset. Rain fell on 15 days of the month on average. It varied a lot from year to year. March 2020 had 8 rain days; 2023 had 26.

With 28 days above 30°C on average, most of the month felt like high summer.

Typhoons i

1 of the last 20 years had a tropical storm pass within 300 km this month.

  • Bavi (2015), 5 km away tropical storm
1 12 13 24 35 16 37 48 49 610 411 112

Date by date i

‹ February March 2027 April ›
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
1-6rain on 51% of days30° 24°
7-13rain on 44% of days30° 24°
14-20rain on 55% of days30° 24°
21-27rain on 41% of days31° 24°
28-31rain on 53% of days31° 24°

0-5/206-8/209-11/2012-20/20

1-6rain on 51% of days30° 24°
7-13rain on 44% of days30° 24°
14-20rain on 55% of days30° 24°
21-27rain on 41% of days31° 24°
28-31rain on 53% of days31° 24°
Tap another date to change

200616mm
2007none
2008none
2009none
20105mm
20116mm
20122mm
20132mm
20144mm
201570mm
20166mm
201724mm
2018none
20191mm
20202mm
20211mm
20224mm
20231mm
2024none
20251mm
Holidays in March (2027)
  • March 1 Guam History and CHamoru Heritage Day

1 Local public holiday or break (busier, pricier)

Your trip dates, the past 20 years

Trip dates ~

You can also click two dates on the axis. Hover a cell to see that day's rain.
Trip rain days Month rain days
2006
1 d 13 d
2007
6 d 12 d
2008
4 d 10 d
2009
1 d 14 d
2010
3 d 15 d
2011
5 d 23 d
2012
4 d 21 d
2013
3 d 17 d
2014
4 d 15 d
2015
3 d 13 d
2016
2 d 10 d
2017
4 d 16 d
2018
0 d 14 d
2019
2 d 10 d
2020
0 d 8 d
2021
6 d 12 d
2022
2 d 20 d
2023
6 d 26 d
2024
2 d 11 d
2025
3 d 19 d
Years with rain
Tap a date to start, tap another to end. Each cell is that date in one year.
'06'07'08'09'10'11'12'13'14'15'16'17'18'19'20'21'22'23'24'25
of 20
14
10
9
7
11
10
12
8
7
10
6
12
6
8
11
14
15
11
10
8
9
7
6
9
10
11
6
8
10
12
12
Rain days on trip
16413543432402062623

No rain1-9 mm10 mm or more Dates outside your trip are dimmed.

One row per year, one cell per day. 2020 had 8 rain days, 2023 had 26.

Guam through the year

MonthHighLowRain daysRainfallSea
JanuaryGood 30°24°18 days163mm 29°
FebruaryGood 30°24°13 days100mm 28°
March 31°24°15 days91mm 28°
April 31°25°16 days104mm 29°
May 32°25°17 days139mm 29°
June 31°25°19 days155mm 30°
July 31°25°22 days314mm 30°
August 31°25°23 days451mm 30°
September 31°25°24 days444mm 30°
October 31°25°24 days427mm 30°
November 31°25°20 days186mm 30°
DecemberGood 30°25°19 days121mm 29°

Common questions

Does it rain a lot in Guam in March?

Over the past 20 years March averaged 15 rain days (1 mm or more) out of 31. Individual years ran from 8 in the driest to 26 in the wettest.

What should I wear in Guam in March?

Days averaged 31°C and nights 24°C. Pack an umbrella, sandals that can get wet, T-shirts, sunscreen plus a hat, a swimsuit, and insect repellent.

Can you swim in Guam in March?

Sea surface temperature averaged 28.1°C in March, warm enough to stay in for a long swim. Year to year it ranged 27.5-28.5°C. Check local flags for waves and jellyfish on the day.

Is March a good time to visit Guam?

On warmth and rain days alone, Guam's easiest months were December to February. March ranked 4 of 12.

Is Guam humid in March?

Mean relative humidity was 80%, with about 31 muggy days (dew point of 20°C or more) in the month.