Guam August 21 Weather Records

Daily averages and all-time records for weather in Guam for the date of August 21.

August 21 All-Time Records
1945–2024

91 °F

71 °F

81 °F

Highest daily low

81 °F

5.02 inches

Most snow

none

August 21 Average Weather
1991–2020 ¹

Average high

87.3 °F

Average low

76.5 °F

Chance precipitation

82.1%

Chance snow

Year	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
2023	86	77	1.49	0.0
2022	84	75	0.00	0.0
2021	87	77	0.07	0.0
2020	89	78	0.00	0.0
2019	89	75	0.09	0.0
2018	81	75	4.31	0.0
2017	86	76	0.77	0.0
2016	90	80	1.34	0.0
2015	83	74	0.22	0.0
2014	87	76	0.05	0.0
2013	87	76	0.50	0.0
2012	85	77	0.46	0.0
2011	86	78	0.62	0.0
2010	83	75	2.31	0.0
2009	89	75	1.23	0.0
2008	84	75	0.00	0.0
2007	82	75	0.50	0.0
2006	87	75	0.01	0.0
2005	88	77	0.00	0.0
2004	88	78	0.02	0.0
2003	89	79	0.02	0.0
2002	88	76	0.00	0.0
2001	89	77	0.65	0.0
2000	89	78	0.60	0.0
1999	87	75	0.44	0.0
1998	87	78	0.06	0.0
1997	86	75	2.36	0.0
1996	85	75	0.06	0.0
1995	89	75	0.10	0.0
1994	90	77	0.00	0.0
1993	88	76	0.00	0.0
1992	89	79	0.19	0.0
1991	83	71	4.40	0.0
1990	88	76	0.17	0.0
1989	90	76	0.00	0.0
1988	90	79	0.00	0.0
1987	89	76	0.23	0.0
1986	89	75	0.48	0.0
1985	84	74	0.16	0.0
1984	90	74	1.53	0.0
1983	90	78	0.00	0.0
1982	86	73	0.38	0.0
1981	86	76	0.60	0.0
1980	89	77	0.37	0.0
1979	86	79	0.04	0.0
1978	87	75	0.26	0.0
1977	89	81	0.08	0.0
1976	81	72	5.02	0.0
1975	85	77	0.25	0.0
1974	87	75	0.04	0.0
1973	82	77	1.22	0.0
1972	84	76	0.02	0.0
1971	91	79	0.17	0.0
1970	88	75	0.12	0.0
1969	91	78	0.00	0.0
1968	87	74	0.32	0.0
1967	82	72	1.92	0.0
1966	89	78	0.31	0.0
1965	89	76	0.00	0.0
1964	87	73	0.08	0.0
1963	88	76	0.01	0.0
1962	86	76	0.01	n/a
1961	83	74	0.22	0.0
1960	85	71	0.68	0.0
1959	84	78	0.62	0.0
1958	87	76	0.27	0.0
1957	85	77	0.04	0.0
1956	88	77	0.44	n/a
1955	87	73	0.77	n/a
1954	86	75	0.01	n/a
1953	88	77	0.00	n/a
1952	87	77	0.04	n/a
1951	87	75	1.02	n/a
1950	90	74	0.66	n/a
1949	87	78	0.08	n/a
1948	87	76	0.09	n/a
1947	87	76	0.56	n/a
1946	n/a	n/a	n/a	n/a

What's the all-time high for Guam on 8/21?

For the date of Aug 21, the highest temperature ever reached in Guam history is 91 °F which has happened 2 times, most recently in 1971.

Highest Temperatures in Guam on August 21

What's the all-time low for Guam on 8/21?

For the date of Aug 21, the lowest temperature ever reached in Guam history is 71 °F which has happened 2 times, most recently in 1991.

Lowest Temperatures in Guam on August 21

Lowest High Temperatures in Guam on August 21

What's the most it has ever rained in Guam on 8/21?

For the date of Aug 21, the most precipitation ever recorded in Guam history is 5.02 inches which happened in 1976.

All-Time Most Precipitation in Guam on August 21

Weather Station Details

Years	Station	Coordinates
1945–2024	Guam International Airport	location