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Guam Climate & Temperature

  • Guam, Mariana Islands is at 13°28'N, 144°47'E, 75 m (247 ft). See map.
  • Guam has a tropical wet climate (Köppen-Geiger classification: Af) with no dry or cold season as it is constantly moist (year-round rainfall).
  • The annual mean temperature is 27.5 degrees Celsius (81.5 degrees Fahrenheit). See the temperatures page for a monthly breakdown and the fixed scale graph.
  • Average monthly temperatures vary by 1.4 °C (2.5°F). This indicates that the continentality type is hyperoceanic, subtype extremely hyperoceanic.
  • Total annual Precipitation averages 2311.8 mm (91 inches) which is equivalent to 2311.8 Litres/m² (56.7 Gallons/ft²).
  • On average there are 2422 hours of sunshine per year. Visit the sunshine and daylight section to check monthly details including how high in the sky the sun reaches each month.
  • If you were to burrow down through the Earth from Guam you would come out nearest to the climate station at Aracaju, Brazil where you would find a Tropical monsoonal climate (Tropical dry forest biome).
Climate Variable Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
maximum temperature iconAverage Max Temperature °C ( °F) 30 (85) 30 (85) 30 (86) 31 (87) 31 (87) 31 (88) 31 (87) 31 (87) 31 (87) 31 (88) 31 (87) 30 (86) 31 (87)
average temperature iconAverage Temperature °C ( °F) 27 (80) 27 (80) 27 (81) 28 (82) 28 (82) 28 (83) 28 (82) 28 (82) 28 (82) 28 (82) 28 (82) 27 (81) 28 (81)
minimum temperature iconAverage Min Temperature °C ( °F) 24 (75) 24 (75) 24 (75) 24 (76) 25 (76) 25 (77) 25 (77) 25 (76) 25 (77) 25 (76) 25 (77) 24 (76) 25 (76)
rainfall iconAverage Precipitation mm (in) 113 (4) 95 (4) 76 (3) 99 (4) 154 (6) 164 (6) 268 (11) 349 (14) 343 (13) 307 (12) 208 (8) 137 (5) 2312 (91)
rain days iconNumber of Wet Days (probability of rain on a day) 14 (45%) 12 (42%) 12 (39%) 10 (33%) 14 (45%) 18 (60%) 24 (77%) 23 (74%) 23 (77%) 23 (74%) 20 (67%) 18 (58%)   211 (58%)
sunshine iconAverage Sunlight Hours/ Day 05:56 06:43 08:30 08:18 07:52 08:06 05:38 05:46 05:08 05:25 06:18 05:54   06:37
daylight iconAverage Daylight Hours & Minutes/ Day 11:25 11:40 12:02 12:25 12:44 12:53 12:49 12:33 12:11 11:48 11:29 11:20   12:00
sunny or cloudy iconPercentage of Sunny (Cloudy) Daylight Hours 53 (47) 58 (42) 71 (29) 67 (33) 62 (38) 63 (37) 44 (56) 46 (54) 43 (57) 46 (54) 55 (45) 53 (47)   55 (45)
sun altitude iconSun altitude at solar noon on the 21st day (°). 56.5 65.7 76.6 88.3 83.3 80 82.8 88.5 77.2 65.6 56.5 53.1   72.7

Guam Climate Comparisons

In depth comparisons with over 3,600 world destinations. Better understand a climate by comparing it relative to one you know (check it out):

Bangkok, Beijing, Bogotá, Buenos Aires, Cairo, Delhi, Dhaka, Guangzhou, Istanbul, Jakarta, Karachi, Kolkata, Lagos, London, Los Angeles, Manila, Mexico City, Moscow, Mumbai, New York, Osaka, Rio de Janeiro, São Paulo, Seoul, Shanghai, Tokyo, other.

Guam Climate Graph in Metric Units

Guam Climate Graph

Guam Climograph in English Units

Guam Climate Graph

Resources

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