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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 mean annual 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. Guam Climate Graph
  • 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.
  • Were you to burrow down through the centre of the Earth from Guam you would pop up nearest to the climate station at Aracaju, Brazil where you would find a Tropical monsoonal climate (Tropical dry forest biome).

Guam Climate Table

  Climate Variable Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
 
Average 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 °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)
 
Average 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)
 
Average 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)
Number 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)
Average Sunlight Hours/ Day 5h 56' 6h 43' 8h 30' 8h 18' 7h 52' 8h 06' 5h 38' 5h 46' 5h 08' 5h 25' 6h 18' 5h 54' 6h 37'
Average Daylight Hours/ Day 11h 25' 11h 40' 12h 02' 12h 25' 12h 44' 12h 53' 12h 49' 12h 33' 12h 11' 11h 48' 11h 29' 11h 20' 12h 00'
Percentage 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 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

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