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Contents
- The climate of Agat
- The best time to visit Agat
- The worst time to visit Agat
- Spring weather in Agat
- Summer weather in Agat
- Autumn weather in Agat
- Winter weather in Agat
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of Agat
Agat, located in the USA territory of Guam, experiences a dominant Af - Tropical rainforest climate as per Köppen's climate classification. This classification is principally due to the humidity levels remaining above the 76% mark throughout the year, combined with substantial rainfall distributed evenly across the calendar months. Geographic proximity to the equator reinforces this climate, manifesting through consistently stable high-temperature readings, averaging between 81.7°F (27.6°C) and 84.7°F (29.3°C).
Throughout the year, Agat is known for its warm and humid weather conditions. Temperatures oscillate modestly, with minimal deviations in maximum and minimum readings. Most monthly average high temperatures peak at 84.7°F (29.3°C), and the lows rarely drop below 79.7°F (26.5°C). Rainfall follows a similar pattern. As a tropical rainforest climate locale, it records substantial precipitation year-round, averaging from 1.81" (46mm) to 10.28" (261mm) monthly. The town witnesses sunshine for an average of 6.3 hours to 10.6 hours daily, further enhancing this hot, tropical experience.
However, despite the heavy rainfall, Agat experiences a good number of days with sunshine, averaging 1.1 to 6.6 days of sun each month. In terms of visibility, the figure remains constant at a monthly average of six miles, indicating relatively clear conditions for most of the year. Wind speeds average from 9.6mph (15.4km/h) to 16.3mph (26.2km/h), with gusts reaching up to a maximum of 22.2mph (35.7km/h).
Throughout the year, Agat is known for its warm and humid weather conditions. Temperatures oscillate modestly, with minimal deviations in maximum and minimum readings. Most monthly average high temperatures peak at 84.7°F (29.3°C), and the lows rarely drop below 79.7°F (26.5°C). Rainfall follows a similar pattern. As a tropical rainforest climate locale, it records substantial precipitation year-round, averaging from 1.81" (46mm) to 10.28" (261mm) monthly. The town witnesses sunshine for an average of 6.3 hours to 10.6 hours daily, further enhancing this hot, tropical experience.
However, despite the heavy rainfall, Agat experiences a good number of days with sunshine, averaging 1.1 to 6.6 days of sun each month. In terms of visibility, the figure remains constant at a monthly average of six miles, indicating relatively clear conditions for most of the year. Wind speeds average from 9.6mph (15.4km/h) to 16.3mph (26.2km/h), with gusts reaching up to a maximum of 22.2mph (35.7km/h).
The best time to visit Agat
The optimal time for visiting Agat corresponds to the spring months. During this period, the town hosts relatively less rainfall, with average monthly precipitation lowering down to 1.81" (46mm) in March. Concurrently, it records a high sunshine duration of more than 8 hours per day. Coupled with a comparatively lower humidity level of 77%, this time serves as an optimal window for enjoying outdoor activities.
The worst time to visit Agat
Agat's least favorable period for a visit is during the September, defined by the highest rainfall recorded in a year. The average rainfall shoots up to 10.28" (261mm) in this month, coupled with a high of 28.1 days of rainfall. Although an increase in humidity could potentially intensify the heat perception, temperatures remain quite stable and do not present significant discomfort.
Spring weather in Agat
Spring - encompassing March, April, and May in Agat - typically brings lesser rainfall, with precipitation totals falling between 1.81" (46mm) to 3.31" (84mm). The sunshine exposure ranges from 8.1 to 10.5 hours per day, allowing for considerably warm and well-lit days. Visibility stands constant at a monthly average of six miles, suggestive of reasonably clear weather conditions.
Summer weather in Agat
Under the summer sun, Agat witnesses an escalation in rainfall, particularly from June onwards. A gradual increase in precipitation from 3.7" (94mm) in June to a peak of 10.28" (261mm) in September characterizes this season. Average temperature remains stable, with highs marking between 84.7°F (29.3°C) and 84.4°F (29.1°C), and lows from 82.2°F (27.9°C) to 82.8°F (28.2°C). Hence, despite the elevated rain levels, temperatures remain pleasant.
Autumn weather in Agat
Rainfall continues to dominate the autumnal vista in Agat, with average monthly totals ranging from 8.46" (215mm) in October to 4.69" (119mm) in November. Day temperatures remain constant, delineating a pattern similar to summer with a meager modification in temperatures. While the daylight hours dip slightly from 12.2 hours in September to 11.5 hours in November, sunshine hours reduce significantly, averaging between 6.9 to 6.3 hours.
Winter weather in Agat
During the winter season in Agat, the rainfall begins to decline, settling at an average of 2.99" (76mm) in December. This period has the lowest rainfall days, averaging 22.8 days. The temperature range remains steadfast, with highs averaging 84.2°F (29°C) to 83.5°F (28.6°C) and lows from 82.8°F (28.2°C) to 82°F (27.8°C). The sunshine hours hit the year’s low, averaging 6.5 hours in December, making for slightly shorter days.
Weather in January
Agat begins the year with mild tropical weather that offers comfortable conditions for outdoor activities. The month carries the least rainfall with only 2.83" (72mm), setting the tone for perfect beach visits or exploratory hikes. Weather in January »
Weather in February
February in Agat sustains the pleasant weather pattern witnessed in January. The 0.6°F (-17.4°C) dip in temperature from the previous month ensures that the warm atmosphere remains enjoyable for the guests. The relatively less rainfall and humidity make the Agat's attractions more welcoming for outdoor enthusiasts. Weather in February »
Weather in March
The weather conditions in March hold steady in Agat with comfortable temperatures and humidity levels. Month transition from February to March brings an increase in daylight and sunshine hours, enhancing the panoramic views of the town. Weather in March »
Weather in April
April maintains the consistent weather pattern observed in Agat with no significant change in temperature or humidity. A continuation of increasing daylight hours provides more opportunities for enjoying outdoor activities, particularly between sunrise and sunset. Weather in April »
Weather in May
May is the start of warmer months in Agat, coupled with more extended periods of daylight. The temperature highs reach up to 84.2°F (29°C), making the atmosphere slightly more heated than the prior months. The arrival of summer marks a notable rise in rainfall with the May showers reaching 3.31" (84mm). Weather in May »
Weather in June
June in Agat exhibits definitive summer weather, noticeable in the upswing of temperature and the increase in daylight hours. A transition from May to June witnesses a spike in rainfall totalizing 3.7" (94mm) in the month. However, the relative humidity levels remain constant, keeping the warmth comprehensible for the visitors. Weather in June »
Weather in July
The month of July sees Agat deeply entrenched in the summer season with the highest rainfall reaching 7.52" (191mm), marking it as the start of the city's wet period. Despite this, the increased moisture content doesn't greatly affect the town's relative humidity, suggesting a steady and manageable weather condition for its residents and visitors. Weather in July »
Weather in August
August carries forward the weather profile of July in Agat, with high rainfall and temperature. This wet period reaches its maximum in August as the rainfall measures up to a significant 9.76" (248mm). Despite the increased rainfall, the town’s visitors enjoy the local attractions amid the tropical temperatures. Weather in August »
Weather in September
September is a subtle shift in weather from the peak of summer in Agat, with declining rainfall and slightly lower temperatures. However, the high precipitation levels continue with rainfall reaching 10.28" (261mm), marking the highest rainfall for the year. Weather in September »
Weather in October
October predicts the onset of cooler months in Agat and also represents a respite from the high rainfall of previous months. The weather conditions start to slightly cool down from the high heat of summer, though temperatures remain balmy for the warmth seekers. Weather in October »
Weather in November
November, the last month of the autumn in Agat, is also a moderately hot month, with an average temperature varying between 82.8°F (28.2°C) and 84.2°F (29°C). Agat ushers in November with an average high-temperature of a still moderately hot 84.2°F (29°C), showing a close resemblance to the previous month. Weather in November »
Weather in December
December brings the soothing cool weather to Agat, granting a relief from the comparatively hot climate witnessed through the year. Interestingly, even towards the end of the year, the minimum temperature stays at a comfortable 82°F (27.8°C), providing an enjoyable atmosphere. Weather in December »
Updated: Aug 15, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the most humid month?
The months with the highest humidity are January, March through May, October through December, with an average relative humidity of 78%.
How many days does it rain?
Throughout the year, there are 288.5 rainfall days, and 60.08" (1526mm) of precipitation is accumulated.
When is the highest UV index?
The months with the highest UV index are January through August, October through December, with an average maximum UV index of 7.
What is the coldest time of year?
February, with average temperatures reaching a high of 81.7°F (27.6°C) and a low of 79.7°F (26.5°C), is the coldest month in Agat.
What is the driest month?
March is the month with the least rainfall. Rain falls for 20.2 days and accumulates 1.81" (46mm) of precipitation.
When are the longest days?
June has the longest days of the year, with an average of 12h and 54min of daylight.
What month has the most sunshine?
The month with the most sunshine is June, with an average of 10.6h of sunshine.
What is the hottest time of year?
Agat's peak temperatures tend to occur in July and August, with an average high-temperature of 84.7°F (29.3°C).
What is the least humid month?
With an average relative humidity of 76%, August is the least humid month in Agat.
What is the rainiest month?
September is the month with the most rainfall. Rain falls for 28.1 days and accumulates 10.28" (261mm) of precipitation.
When is the lowest UV index?
The month with the lowest UV index is September, with an average maximum UV index of 6.
What is the month with the least sunshine?
November has the least sunshine of the year, with an average of 6.3h of sunshine.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 11h and 24min of daylight.
Is there Daylight Saving Time (DST) in Agat?
Agat does not observe Daylight Saving Time (DST). ChST timezone is used over the entire year.
Average temperature
Agat, GU
The warmest months (with the highest average high temperature) are July and August (84.7°F).
The month with the lowest average high temperature is February (81.7°F).
The month with the highest average low temperature is June (83.3°F).
The coldest month (with the lowest average low temperature) is February (79.7°F).
Average pressure
Agat, GU
- Average pressure in January:
29.86"Hg - Average pressure in February:
29.88"Hg - Average pressure in March:
29.87"Hg - Average pressure in April:
29.86"Hg - Average pressure in May:
29.85"Hg - Average pressure in June:
29.84"Hg
- Average pressure in July:
29.8"Hg - Average pressure in August:
29.79"Hg - Average pressure in September:
29.79"Hg - Average pressure in October:
29.79"Hg - Average pressure in November:
29.82"Hg - Average pressure in December:
29.83"Hg
The month with the highest atmospheric pressure is February (29.88"Hg).
The months with the lowest atmospheric pressure are August, September and October (29.79"Hg).
Average wind speed
Agat, GU
- Average wind speed in January:
15.8mph - Average wind speed in February:
16.3mph - Average wind speed in March:
15mph - Average wind speed in April:
13.7mph - Average wind speed in May:
11.7mph - Average wind speed in June:
11.6mph
- Average wind speed in July:
10.3mph - Average wind speed in August:
9.6mph - Average wind speed in September:
9.9mph - Average wind speed in October:
11.2mph - Average wind speed in November:
14.7mph - Average wind speed in December:
15.7mph
The windiest month (with the highest average wind speed) is February (16.3mph).
The calmest month (with the lowest average wind speed) is August (9.6mph).
Average humidity
Agat, GU
The months with the highest relative humidity are January, March, April, May, October, November and December (78%).
The month with the lowest relative humidity is August (76%).
Average rainfall
Agat, GU
- Average rainfall in January:
2.83" - Average rainfall in February:
2.28" - Average rainfall in March:
1.81" - Average rainfall in April:
2.44" - Average rainfall in May:
3.31" - Average rainfall in June:
3.7"
- Average rainfall in July:
7.52" - Average rainfall in August:
9.76" - Average rainfall in September:
10.28" - Average rainfall in October:
8.46" - Average rainfall in November:
4.69" - Average rainfall in December:
2.99"
The wettest month (with the highest rainfall) is September (10.28").
The driest month (with the least rainfall) is March (1.81").
Average rainfall days
Agat, GU
- Average rainfall days in January:
21.3 days - Average rainfall days in February:
17.5 days - Average rainfall days in March:
20.2 days - Average rainfall days in April:
19.3 days - Average rainfall days in May:
23.1 days - Average rainfall days in June:
25.4 days
- Average rainfall days in July:
28.9 days - Average rainfall days in August:
28.9 days - Average rainfall days in September:
28.1 days - Average rainfall days in October:
28.7 days - Average rainfall days in November:
24.3 days - Average rainfall days in December:
22.8 days
The months with the highest number of rainy days are July and August (28.9 days).
The month with the least rainy days is February (17.5 days).
Average daylight / Average sunshine
Agat, GU
- Average daylight in January:
11h and 2min - Average daylight in February:
11h and 4min - Average daylight in March:
12h and 1min - Average daylight in April:
12h and 2min - Average daylight in May:
12h and 4min - Average daylight in June:
12h and 5min
- Average daylight in July:
12h and 5min - Average daylight in August:
12h and 4min - Average daylight in September:
12h and 1min - Average daylight in October:
11h and 5min - Average daylight in November:
11h and 3min - Average daylight in December:
11h and 2min
The month with the longest days is June (Average daylight: 12h and 54min).
The month with the shortest days is December (Average daylight: 11h and 24min).
- Average sunshine in January:
7h and 4min - Average sunshine in February:
8h and 0min - Average sunshine in March:
8h and 1min - Average sunshine in April:
8h and 3min - Average sunshine in May:
10h and 3min - Average sunshine in June:
10h and 4min
- Average sunshine in July:
8h and 4min - Average sunshine in August:
7h and 4min - Average sunshine in September:
7h and 5min - Average sunshine in October:
6h and 5min - Average sunshine in November:
6h and 2min - Average sunshine in December:
6h and 3min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is November (Average sunshine: 6h and 18min).
Average sunshine days
Agat, GU
- Average sunshine days in January:
5.4 days - Average sunshine days in February:
5.8 days - Average sunshine days in March:
6.6 days - Average sunshine days in April:
5.8 days - Average sunshine days in May:
4.3 days - Average sunshine days in June:
2.1 days
- Average sunshine days in July:
1.4 days - Average sunshine days in August:
1.6 days - Average sunshine days in September:
1.1 days - Average sunshine days in October:
1.4 days - Average sunshine days in November:
3.6 days - Average sunshine days in December:
4.7 days
The month with the most sunshine days is March (6.6 days).
The month with the least sunshine days is September (1.1 days).
Average UV index
Agat, GU
The months with the highest UV index are January, February, March, April, May, June, July, August, October, November and December (UV index 7).
The month with the lowest UV index is September (UV index 6).
Average cloud cover
Agat, GU
The months with the most cloud cover are January, August and October (Cloud cover 46).
The months with the least cloud cover are May and June (Cloud cover 39).
Average visibility
Agat, GU
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Agat, Guam, USA
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