Tamuning, Guam — Weather in August 2026

Climate Overview

Tamuning, Guam in August has hot conditions, with highs reaching 28.6°C (83°F) and afternoons the warmest part of the day. Rain falls on about 29 days this month, totalling around 361 mm. Sea temperature reaches 30°C (86°F).

This month falls at the end of Summer.

Temperatures remain fairly steady throughout August, with daily highs around 29°C (84°F).

August sees fairly even rainfall, totalling about 362 mm across the month.

Expect around 7.9h of sunshine at the start of August, increasing to 8.8h by the end.

Wind speeds ease off through the month, from 27 km/h (17 mph) to 24 km/h (15 mph).

The warmest days tend to fall around the 5th, averaging 28.7°C (84°F).

Monthly August Averages

Temperature

29°C / 26°C

Feels Like

34°C / 30°C

Rain

29 days · 361 mm

Sunshine

8.7h / day

Humidity

84% — Very Muggy

Wind

24 km/h

Wind Direction

SE (131°)

Gusts

35 km/h

Daylight

12.6 h

Cloud Cover

90%

Clear Sky Days

0.1

UV Index

8.2 — Very High

Sea Temperature

30°C

Dew Point

25°C — Oppressive

Moon Phase

Waxing Crescent · 3%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

HighLow

Daily Precipitation

Rainfall

Daily Sunshine

Sunshine

Daily Wind Speed

Wind Speed

Sun Position

Sunrise 06:09

Daylight 12.6h

Sunset 18:44

What to Expect

Daytime temperatures around 29°C (83°F) are ideal for full-day outdoor exploration. Keep afternoons flexible as tropical showers are common — they typically clear within an hour.

Rain most often builds later in the day, so mornings are typically the driest window and afternoon showers are more likely.

Recent yearly records for August have stayed close to the long-run average.

Compare Months

Month	Temp	Feels Like	Rain	Sun	Humidity	UV	Status	Details
January best	28°C / 26°C	29°C / 27°C	15days (70 mm) Wet	10.4h Excellent	78% Humid	7 High	Good	View Details
February best	27°C / 26°C	29°C / 26°C	12days (60 mm) Wet	10.6h Excellent	78% Humid	8.1 Very High	Good	View Details
March best	28°C / 26°C	31°C / 27°C	12days (44 mm) Wet	10.9h Excellent	79% Humid	9 Very High	Good	View Details
April best	28°C / 26°C	32°C / 28°C	13days (83 mm) Wet	11.1h Excellent	80% Humid	9.2 Very High	Good	View Details
May	29°C / 27°C	33°C / 29°C	15days (95 mm) Wet	11.5h Excellent	81% Humid	8.4 Very High	Fair	View Details
June	29°C / 27°C	33°C / 30°C	20days (155 mm) Wet	11h Excellent	82% Humid	8.4 Very High	Wet	View Details
July	29°C / 27°C	33°C / 30°C	29days (273 mm) Wet	9.8h Good	83% Humid	7.9 Very High	Wet	View Details
August	29°C / 26°C	34°C / 30°C	29days (361 mm) Wet	8.7h Good	84% Humid	8.2 Very High	Wet	View Details
September	29°C / 26°C	34°C / 30°C	28days (369 mm) Wet	8.7h Good	83% Humid	8.1 Very High	Wet	View Details
October	29°C / 26°C	33°C / 29°C	28days (359 mm) Wet	8.7h Good	84% Humid	7.8 Very High	Wet	View Details
November	29°C / 27°C	32°C / 29°C	24days (183 mm) Wet	9.7h Good	82% Humid	7.2 Very High	Wet	View Details
December	28°C / 27°C	31°C / 28°C	19days (101 mm) Wet	10.3h Excellent	80% Humid	6.9 High	Wet	View Details

What to Wear

Summer clothing like shorts, t-shirts, and sundresses will be comfortable. Bring a light cardigan for air-conditioned spaces.

A waterproof jacket or compact umbrella is recommended for occasional showers.

Packing List

UmbrellaWaterproof jacketWaterproof shoesBreathable clothingSunscreen (SPF 30+)Sun hatSunglasses

Frequently Asked Questions

Expand all

Is August a good time to visit Tamuning?

August is typically wet for visiting Tamuning, with average highs of 29°C (83°F) and around 29 rainy days. Tamuning, Guam in August has hot conditions, with highs reaching 28.6°C (83°F) and afternoons the warmest part of the da

Does it rain a lot in Tamuning in August?

Tamuning typically sees around 29 rainy days in August with 361 mm (14.2 in) of total rainfall. Pack a waterproof jacket.

Does it get cold at night in Tamuning in August?

Nights stay pleasantly warm in Tamuning during August, around 26°C (79°F). Light evening wear is sufficient.

What should I pack for Tamuning in August?

With highs of 29°C (83°F) and lows of 26°C (79°F) in August, we recommend: Umbrella, Waterproof jacket, Waterproof shoes, Breathable clothing, Sunscreen (SPF 30+). Comfortable walking shoes are essential.

Is August among the best months weather-wise in Tamuning?

August is not the most favourable month weather-wise in Tamuning. Consider visiting during months with milder temperatures or less rainfall for a better experience.

What is the UV index in Tamuning in August?

The average UV index in Tamuning during August is 8 (very high). Strong sun protection is essential — SPF 50+, protective clothing, and avoid prolonged outdoor exposure during peak hours.

How many hours of daylight are there in Tamuning in August?

Tamuning gets approximately 13 hours of daylight per day in August, with around 9 hours of sunshine.

Does it snow in Tamuning in August?

Snow is uncommon in Tamuning during August based on 10-year climate averages.

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