DRIESTSINCE
Guam · precipitation record 1945–2026

Guam, GU

THIS MONTH · 2026
WETTEST THIS MONTH SINCE 2015
20.84in
3rd wettest of 80 years · normal 8.68"
📖 Guam's full Precipitation Almanac →

Accumulation

TODAY
0.19in
34th wettest of 79 yrs
158% of normal
MONTH TO DATE
20.84in
3rd wettest of 80 yrs
240% of normal
LAST 90 DAYS
35.26in
7th wettest of 80 yrs
181% of normal
YEAR TO DATE
69.32in
4th wettest of 79 yrs
211% of normal

Extremes & Streaks

Biggest Day on Record

19.67in
on Dec 8, 2002 · in 82 years

Dry Streak

2days
current run under 0.01" · longest ever 18 days (to Dec 23, 1977)

Wet Streak

0days
consecutive days with rain · longest ever 55 days

Year to Date vs Normal

211%
69.32" of a normal 32.88" · wettest 92.9" (1976) · driest 12.88" (1959)

Wettest & Driest Years

The extremes of a 78-year record (1948–2025) — full calendar-year totals. The long-run average is 92.76" a year.

Wettest Years on Record

11976142.28in
22023140.01in
32004139.33in
42002139.06in
51997131.74in

Driest Years on Record

1199857.88in
2197359.14in
3198361.05in
4195961.62in
5197067.31in

Rainfall by Month

The seasonal rhythm — each month's normal precipitation, with this year's totals in blue. Where the blue bar clears the band, the month ran wetter than usual.
J
F
M
A
M
J
J
A
S
O
N
D
Normal (median)This year
Normally wettest in Sep (~13.64") and driest in Mar (~2.14"). Wettest calendar month ever: Aug 1997, 38.49".

This Day in History · Rainfall

Every year's rainfall on each of the next 7 dates at Guam — toggle a day below. The tallest bar (ringed) is the wettest on record for that date.

Wettest Jul 28 ever

4.29in
set in 2011

Rain on Jul 28

87%
of 79 years had measurable rain
1947: 0.07″1948: 0.01″1949: 0.00″1950: 0.47″1951: 0.08″1952: 0.56″1953: 0.00″1954: 0.21″1955: 0.04″1956: 0.71″1957: 0.81″1958: 0.31″1959: 0.15″1960: 0.30″1961: 0.02″1962: 0.17″1963: 0.29″1964: 0.01″1965: 1.76″1966: 0.04″1967: 0.24″1968: 0.05″1969: 1.33″1970: 1.04″1971: 0.11″1972: 1.25″1973: 0.01″1974: 0.02″1975: 0.00″1976: 1.31″1977: 0.09″1978: 0.00″1979: 1.21″1980: 0.00″1981: 0.26″1982: 0.10″1983: 0.00″1984: 0.01″1985: 0.05″1986: 0.07″1987: 0.15″1988: 0.44″1989: 0.52″1990: 0.01″1991: 0.28″1992: 0.00″1993: 0.06″1994: 2.04″1995: 0.00″1996: 4.07″1997: 0.07″1998: 1.03″1999: 0.75″2000: 0.01″2001: 0.09″2002: 1.45″2003: 0.19″2004: 0.01″2005: 0.05″2006: 0.92″2007: 0.03″2008: 0.01″2009: 0.07″2010: 1.90″2011: 4.29″2012: 0.41″2013: 0.00″2014: 0.75″2015: 0.01″2016: 0.03″2017: 0.00″2018: 0.12″2019: 0.53″2020: 0.22″2021: 0.03″2022: 0.17″2023: 1.44″2024: 0.63″2025: 0.19″0″1″2″3″4″5″19501960197019801990200020102020

This Year's Rainfall

Guam's cumulative rainfall so far this year against its own record — the normal accumulation, and the wettest & driest years to date. The bright line is the running total; where it rides the band tells the story at a glance.
Guam, GU — cumulative rainfall this year vs the record
Download year chart

Rainfall Calendar

Guam's entire daily record as one heatmap — each row a year, each cell a day, shaded by that day's rainfall. Dry spells read as dark blocks, wet seasons as brighter bands; the whole climate at a glance.
Guam, GU — daily rainfall every day on record
Download calendar

Sun & Location

Sun & Daylight Today

Sunrise6:05 AM
Sunset6:50 PM
Solar noon12:27 PM
Daylight12h 45m
Local standard time (no DST), level horizon.

Location

13.48°N, 144.80°WGuam

Nearby Stations

Saipan, MP129 mi NELihue, HI3703 mi WHonolulu, HI3794 mi WSt Paul Island, AK3822 mi WKahului, HI3892 mi WHilo, HI3987 mi W

Share Card

Guam, GU precipitation share card
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