Guam weather in August 2019

  • 31°C maximum daytime temperature in August in Guam (Agana)31
    31°C max day temperature
  • 5 hours of sunshine per day
  • 20 days with some rainfall in August in Guam (Agana)20
    20 days with some rainfall
  • 25°C minimum night-time temperature in August in Guam (Agana)25
    25°C min night temperature
  • 13 hours of daylight per day in August in Guam (Agana)13
    13 hours of daylight per day
  • Very high heat & humidity in August in Guam (Agana)VH
    Very High heat & humidity
  • 363 mm monthly rainfall in August in Guam (Agana)363
    363 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in August in Guam (Agana)11
    11+ (Extreme) UV index
  • 29°C sea temperature in August in Guam (Agana)29
    29°C sea temperature

Going to Guam? Find the best month to visit Guam based on the weather.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Expect 31°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Guam in August. Check more long-term weather averages for Guam in August before you book your next holiday to Guam in 2019/2020. The August weather averages shown above are for Agana.

  • Save an extra 10% on worldwide car hire
  • Book with the exclusive Argus Car Hire discount code
  • Travel before 31st December 2019 (inclusive)
Show discount codeShow discount code ******vel

Expires at 23:59 on Tuesday 30th Apr 2019 · View all Argus Car Hire offers

More about Guam

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

The August weather guide for Guam, represented by Agana, shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

Guide to Guam weather in August

The average maximum daytime temperature in Guam in August is a hot 31°C (88°F) with very high heat & humidity. The average night-time temperature is usually a warm 25°C (77°F). There are usually 5 hours of bright sunshine each day, which represents 37% of the 13 hours of daylight.

Expect 363mm (14.3 inches) of rainfall across the whole of August with 20 days with some rain falling. Maximum UV levels will be extreme (11+ UV index) at midday when the skies are clear.

The average sea temperature in and around Guam in August is 29°C (84°F).

The weather in Guam in August is represented by Agana.

Guam sunrise & sunset times for August 2019

Browse the sunrise & sunset times for Guam in August 2019. Select a month to view Guam sunrise & sunset times for the next twelve months. The Guam sunrise & sunset times shown below are for Agana.


Date Sunrise times Sunset times
Thursday, 1st August 2019 06:06 18:49
Friday, 2nd August 2019 06:06 18:49
Saturday, 3rd August 2019 06:06 18:48
Sunday, 4th August 2019 06:06 18:48
Monday, 5th August 2019 06:07 18:47
Tuesday, 6th August 2019 06:07 18:47
Wednesday, 7th August 2019 06:07 18:47
Thursday, 8th August 2019 06:07 18:46
Friday, 9th August 2019 06:07 18:46
Saturday, 10th August 2019 06:07 18:45
Sunday, 11th August 2019 06:08 18:45
Monday, 12th August 2019 06:08 18:44
Tuesday, 13th August 2019 06:08 18:44
Wednesday, 14th August 2019 06:08 18:43
Thursday, 15th August 2019 06:08 18:43
Friday, 16th August 2019 06:08 18:42
Saturday, 17th August 2019 06:08 18:42
Sunday, 18th August 2019 06:09 18:41
Monday, 19th August 2019 06:09 18:41
Tuesday, 20th August 2019 06:09 18:40
Wednesday, 21st August 2019 06:09 18:40
Thursday, 22nd August 2019 06:09 18:39
Friday, 23rd August 2019 06:09 18:38
Saturday, 24th August 2019 06:09 18:38
Sunday, 25th August 2019 06:09 18:37
Monday, 26th August 2019 06:09 18:37
Tuesday, 27th August 2019 06:09 18:36
Wednesday, 28th August 2019 06:09 18:35
Thursday, 29th August 2019 06:09 18:35
Friday, 30th August 2019 06:09 18:34
Saturday, 31st August 2019 06:10 18:33
  • Save up to 35% on hotels & holidays this April
  • Book holidays to top destinations in Europe & Worldwide
  • Including Spain, Greece, Mexico, Thailand and more

Expires at 23:59 on Tuesday 30th Apr 2019 · View all Expedia offers

Back to top

More Guam destinations

All Guam destinations >>

All destinations (A to Z)

Can't see your chosen destination? Use our A to Z search to find your required the holiday weather guide:

A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z  

Related posts

Popular travel offers

Top ^