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Guam · 1991–2020

Best time to visit
Tamuning.

March leads for comfortable weather in Tamuning: typically 30.5°C by day, 24.2°C at night, with 69 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMarch

Typical high30.5°C

Typical low24.2°C

Rain in March69 mm

Comfort

March

March · February · April

49climate match

Beach

March

March · February · April

72climate match

Outdoors

March

March · February · April

27climate match

The weakest month is July, scoring 5 against March’s 49 — 309 mm of rain falls, and days average 31.1°C, 7° above the 24°C the score treats as ideal.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

4029.9° / 24.1°

Feb

4730° / 23.9°

Mar

4930.5° / 24.2°

Apr

4231.2° / 24.9°

May

3631.5° / 25.5°

Jun

2231.5° / 25.6°

Jul

531.1° / 25.1°

Aug

530.7° / 24.7°

Sep

530.6° / 24.6°

Oct

530.8° / 24.9°

Nov

2130.9° / 25.2°

Dec

3030.4° / 24.9°

Monthly climate evidence for Tamuning — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 16 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	29.9°C	24.1°C	128 mm	14.8	27.9°C	11 h 24	40	Strong coverage
February	30°C	23.9°C	100 mm	12.2	27.6°C	11 h 41	47	Strong coverage
March	30.5°C	24.2°C	69 mm	11.7	27.6°C	12 h 01	49	Strong coverage
April	31.2°C	24.9°C	87 mm	13.3	28.1°C	12 h 25	42	Strong coverage
May	31.5°C	25.5°C	110 mm	13.9	28.8°C	12 h 45	36	Strong coverage
June	31.5°C	25.6°C	179 mm	18.7	29.2°C	12 h 55	22	Strong coverage
July	31.1°C	25.1°C	309 mm	21.7	29.4°C	12 h 51	5	Strong coverage
August	30.7°C	24.7°C	446 mm	22.6	29.4°C	12 h 34	5	Strong coverage
September	30.6°C	24.6°C	383 mm	22.2	29.4°C	12 h 11	5	Strong coverage
October	30.8°C	24.9°C	321 mm	21.7	29.3°C	11 h 49	5	Strong coverage
November	30.9°C	25.2°C	206 mm	18.9	29.0°C	11 h 29	21	Strong coverage
December	30.4°C	24.9°C	161 mm	17.3	28.4°C	11 h 20	30	Strong coverage

What has changed

Tamuning runs +0.3°C
on the 1961–1990 baseline.

Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.

Jan

+0.3

Feb

+0.3

Mar

+0.4

Apr

+0.4

May

+0.6

Jun

+0.4

Jul

+0.4

Aug

+0.1

Sep

-0.1

Oct

-0.4

Nov

+0.4

Dec

+0.4

March daytime highs, 2011–2025. Last recorded: 30.0°C.

Records at GUAM INTERNATIONAL AIRPORT, 1945–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	34.4°C9 Jan 1989	18.9°C18 Jan 2000	189 mm14 Jan 1990	460 mm1976 · driest 24 mm in 2018	80
February	33.9°C21 Feb 1946	18.3°C8 Feb 1973	218 mm26 Feb 1980	352 mm1980 · driest 5 mm in 2015	80
March	33.9°C29 Mar 1964	18.9°C14 Mar 1965	97 mm2 Mar 2026	366 mm2026 · driest 10 mm in 1978	79
April	35.6°C1 Apr 1990	20.0°C6 Apr 1965	162 mm17 Apr 1997	388 mm1963 · driest 13 mm in 1966	78
May	34.4°C30 May 1971	21.1°C3 May 1993	470 mm21 May 1976	880 mm1976 · driest 10 mm in 1987	80
June	35.0°C30 Jun 1969	21.1°C14 Jun 1958	406 mm27 Jun 2004	966 mm2004 · driest 21 mm in 1983	80
July	35.0°C18 Jul 1969	21.1°C24 Jul 1949	307 mm5 Jul 2015	757 mm2002 · driest 113 mm in 1954	80
August	34.4°C30 Aug 1994	21.1°C15 Aug 1989	339 mm28 Aug 1992	978 mm1997 · driest 100 mm in 1965	79
September	34.4°C6 Sep 2016	21.1°C12 Sep 1995	259 mm19 Sep 2013	819 mm2013 · driest 99 mm in 1951	80
October	33.9°C6 Oct 1989	19.4°C16 Oct 1966	393 mm15 Oct 1953	678 mm2021 · driest 109 mm in 1976	80
November	33.3°C11 Nov 2016	20.0°C9 Nov 1967	175 mm27 Nov 2019	517 mm2003 · driest 65 mm in 1945	80
December	32.8°C26 Dec 1988	20.0°C31 Dec 1962	500 mm8 Dec 2002	654 mm2002 · driest 37 mm in 2019	80

Typical days per month at GUAM INTERNATIONAL AIRPORT, 1991–2020
Month	Days 25°C+	Days 30°C+	Heavy rain (10 mm+)
January	31	20	3
February	28	19	2
March	31	27	2
April	30	29	2
May	31	30	3
June	30	28	5
July	31	27	9
August	31	25	11
September	30	24	10
October	31	26	9
November	30	27	6
December	31	26	4

The best month has moved. On the 1961–1990 numbers the strongest month here was March (scoring 58); on 2011–2025 it is February (56). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in GUAM INTERNATIONAL AIRPORT’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	54%	46%	10%	63%	28.7–30.7°C
February	60%	40%	7%	56%	28.5–30.6°C
March	63%	37%	6%	50%	29.1–31.0°C
April	59%	42%	7%	59%	29.5–31.7°C
May	55%	45%	10%	63%	29.6–32.0°C
June	41%	59%	15%	84%	29.8–32.2°C
July	32%	68%	26%	93%	29.7–31.8°C
August	30%	71%	33%	94%	29.7–31.4°C
September	28%	72%	33%	94%	29.8–31.5°C
October	31%	69%	29%	91%	29.7–31.6°C
November	36%	64%	20%	87%	29.4–31.5°C
December	46%	54%	11%	78%	29.0–31.0°C

A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

1948Each stripe is one year’s mean temperature against the 77-year average. Warmest: 2018. Coolest: 1950.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 7874631
NOAA station: GQW00041406 · GUAM INTERNATIONAL AIRPORT
Station distance: 6.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 13.49°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 16 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

These places read the same station, so their numbers are identical — distance from GUAM INTERNATIONAL AIRPORT is what differs

Dededo Village→Tamuning-Tumon-Harmon Village→Mangilao Village→Barrigada Village→Santa Rita Village→Mongmong-Toto-Maite Village→

Or put two places side by side: Tamuning vs Dededo Village

Best time to visitTamuning.

March

March

March

The whole year,without the guesswork.

Tamuning runs +0.3°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Tamuning.

The whole year,
without the guesswork.

Tamuning runs +0.3°C
on the 1961–1990 baseline.

Nearby, measured,
and named.