Climate averages 1991–2020
Portmore weather
in August.
A hot, moderately wet month: the 2nd warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Portmore: daytime highs average 31.4°C and nights cool to about 25.4°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 86 mm of rain on roughly 15 days, which makes August a moderately wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 44 min on an average August day.
The nearest other city in this atlas is Spanish Town (8 km away). In August its highs average 31.3°C, about as warm as Portmore, with 86 mm of rain.
Among the 4 cities listed in Jamaica, Portmore ranks 3rd of 4 for the warmest August highs and joint 2nd of 4 for the driest August (rainfall, lowest first). The mean August high of those 4 cities is 31.8°C; Portmore is 0.3°C cooler than that mean.
From August to September, average highs fall by 0.8°C to 30.7°C, and monthly rainfall rises from 86 mm to 139 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Portmore climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.2°C22.2°C | 22.2°C | 17 | 4.4 | 11.211 h |
| February | 28.5°C22.1°C | 22.1°C | 17 | 4.7 | 11.512 h |
| March | 29.0°C22.3°C | 22.3°C | 31 | 6.5 | 12.012 h |
| April | 29.8°C23.2°C | 23.2°C | 48 | 9.4 | 12.513 h |
| May | 30.0°C24.2°C | 24.2°C | 119 | 15.4 | 13.013 h |
| June | 30.5°C25.2°C | 25.2°C | 68 | 11.0 | 13.213 h |
| July | 31.5°C25.3°C | 25.3°C | 52 | 9.4 | 13.113 h |
| August, selected | 31.4°C25.4°C | 25.4°C | 86 | 14.5 | 12.713 h |
| September | 30.7°C25.0°C | 25.0°C | 139 | 18.8 | 12.312 h |
| October | 29.6°C24.4°C | 24.4°C | 140 | 21.3 | 11.712 h |
| November | 28.9°C23.7°C | 23.7°C | 67 | 11.6 | 11.311 h |
| December | 28.4°C22.8°C | 22.8°C | 30 | 6.2 | 11.111 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Spanish Town in AugustJamaica · 8 kmHigh 31.3°C · Low 25.2°C · 86 mm rain
- Kingston in AugustJamaica · 10 kmHigh 32.0°C · Low 24.6°C · 82 mm rain
- Montego Bay in AugustJamaica · 122 kmHigh 32.3°C · Low 25.3°C · 171 mm rain
- Santiago de Cuba in AugustCuba · 254 kmHigh 32.3°C · Low 25.1°C · 82 mm rain
- Manzanillo, Cuba in AugustCuba · 265 kmHigh 33.6°C · Low 24.8°C · 126 mm rain
- Palma Soriano in AugustCuba · 266 kmHigh 32.7°C · Low 23.8°C · 105 mm rain
- Contramaestre in AugustCuba · 267 kmHigh 33.5°C · Low 23.9°C · 86 mm rain
- Bayamo in AugustCuba · 268 kmHigh 33.8°C · Low 23.7°C · 135 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Portmore) is explained once on the Portmore year overview and on the Sources, method and limits page.
Spanish Town lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.