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Isabela, Puerto Rico climate
Am Tropical monsoon
Isabela has a remarkably steady tropical climate (Tropical monsoon, Köppen Am). The hottest month is August with an average daily high near 32°C, while the coldest is January averaging around 18°C at night. Precipitation totals about 1982 mm a year and is strongly seasonal — August alone averages 261 mm while January barely receives 59 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)Isabela climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 29 | 30 | 31 | 31 | 32 | 32 | 32 | 32 | 32 | 31 | 29 |
| Avg temp (°C) | 24 | 24 | 24 | 25 | 26 | 27 | 27 | 27 | 27 | 27 | 26 | 24 |
| Avg low (°C) | 18 | 18 | 19 | 20 | 21 | 22 | 22 | 22 | 22 | 22 | 21 | 19 |
| Precipitation (mm) | 59 | 67 | 83 | 147 | 246 | 231 | 229 | 261 | 235 | 226 | 131 | 68 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 29 | 30 | 31 | 31 | 32 |
| Avg temp (°C) | 24 | 24 | 24 | 25 | 26 | 27 |
| Avg low (°C) | 18 | 18 | 19 | 20 | 21 | 22 |
| Precipitation (mm) | 59 | 67 | 83 | 147 | 246 | 231 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 32 | 32 | 32 | 32 | 31 | 29 |
| Avg temp (°C) | 27 | 27 | 27 | 27 | 26 | 24 |
| Avg low (°C) | 22 | 22 | 22 | 22 | 21 | 19 |
| Precipitation (mm) | 229 | 261 | 235 | 226 | 131 | 68 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 9 | 11 | 12 | 17 | 17 | 15 | 17 | 16 | 16 | 13 | 10 |
| Days with high ≥ 32°C (days) | 0.4 | 0.9 | 4 | 4 | 10 | 15 | 15 | 17 | 18 | 13 | 4 | 0.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 9 | 11 | 12 | 17 | 17 |
| Days with high ≥ 32°C (days) | 0.4 | 0.9 | 4 | 4 | 10 | 15 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 15 | 17 | 16 | 16 | 13 | 10 |
| Days with high ≥ 32°C (days) | 15 | 17 | 18 | 13 | 4 | 0.9 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 40 | 39 | 41 | 44 | 59 | 58 | 53 | 51 | 55 | 51 | 48 | 41 |
| Relative humidity (%) | 78 | 76 | 74 | 75 | 78 | 79 | 79 | 79 | 80 | 80 | 81 | 79 |
| Wind speed (km/h) | 13.7 | 13.5 | 12.6 | 12.1 | 11.7 | 12.6 | 14.1 | 13.1 | 11.3 | 10.8 | 12.4 | 13.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 40 | 39 | 41 | 44 | 59 | 58 |
| Relative humidity (%) | 78 | 76 | 74 | 75 | 78 | 79 |
| Wind speed (km/h) | 13.7 | 13.5 | 12.6 | 12.1 | 11.7 | 12.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 53 | 51 | 55 | 51 | 48 | 41 |
| Relative humidity (%) | 79 | 79 | 80 | 80 | 81 | 79 |
| Wind speed (km/h) | 14.1 | 13.1 | 11.3 | 10.8 | 12.4 | 13.8 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Coloso, a weather station, about 19 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.