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Umatac Village, Guam climate
Af Tropical rainforest
Umatac Village has a remarkably steady tropical climate (Tropical rainforest, Köppen Af). The hottest month is June with an average daily high near 31°C, while the coldest is February averaging around 24°C at night. Precipitation totals about 2498 mm a year and is strongly seasonal — August alone averages 446 mm while March barely receives 68 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Umatac Village climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 30 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 30 |
| Avg temp (°C) | 27 | 27 | 27 | 28 | 28 | 29 | 28 | 28 | 28 | 28 | 28 | 28 |
| Avg low (°C) | 24 | 24 | 24 | 25 | 25 | 26 | 25 | 25 | 25 | 25 | 25 | 25 |
| Precipitation (mm) | 128 | 100 | 68 | 86 | 110 | 179 | 309 | 446 | 383 | 321 | 206 | 161 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 30 | 31 | 31 | 31 | 31 |
| Avg temp (°C) | 27 | 27 | 27 | 28 | 28 | 29 |
| Avg low (°C) | 24 | 24 | 24 | 25 | 25 | 26 |
| Precipitation (mm) | 128 | 100 | 68 | 86 | 110 | 179 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 31 | 31 | 31 | 31 | 30 |
| Avg temp (°C) | 28 | 28 | 28 | 28 | 28 | 28 |
| Avg low (°C) | 25 | 25 | 25 | 25 | 25 | 25 |
| Precipitation (mm) | 309 | 446 | 383 | 321 | 206 | 161 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 20 | 17 | 18 | 19 | 19 | 23 | 26 | 26 | 25 | 25 | 23 | 22 |
| Days with high ≥ 32°C (days) | 0.2 | 0.1 | 1 | 4 | 9 | 11 | 7 | 5 | 4 | 4 | 4 | 0.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 20 | 17 | 18 | 19 | 19 | 23 |
| Days with high ≥ 32°C (days) | 0.2 | 0.1 | 1 | 4 | 9 | 11 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 26 | 26 | 25 | 25 | 23 | 22 |
| Days with high ≥ 32°C (days) | 7 | 5 | 4 | 4 | 4 | 0.9 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 59 | 57 | 51 | 45 | 48 | 54 | 73 | 80 | 81 | 69 | 52 | 53 |
| Relative humidity (%) | 78 | 77 | 77 | 78 | 79 | 80 | 82 | 82 | 82 | 82 | 80 | 79 |
| Wind speed (m/s) | 6.5 | 6.6 | 6.3 | 5.8 | 5.1 | 4.9 | 4.3 | 4.2 | 4.1 | 4.7 | 6.1 | 6.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 59 | 57 | 51 | 45 | 48 | 54 |
| Relative humidity (%) | 78 | 77 | 77 | 78 | 79 | 80 |
| Wind speed (m/s) | 6.5 | 6.6 | 6.3 | 5.8 | 5.1 | 4.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 73 | 80 | 81 | 69 | 52 | 53 |
| Relative humidity (%) | 82 | 82 | 82 | 82 | 80 | 79 |
| Wind speed (m/s) | 4.3 | 4.2 | 4.1 | 4.7 | 6.1 | 6.6 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Guam International Airport, a weather station, about 21 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.