| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 31.3° | 22.3° | 10.3mm | 2.5 | 78 |
| February | 31.1° | 22.1° | 12.6mm | 3.6 | 76 |
| March | 31.3° | 22.9° | 28.5mm | 3.4 | 76 |
| April | 31.8° | 23.6° | 22.9mm | 3.3 | 74 |
| May | 32.3° | 24.5° | 73.8mm | 6.4 | 66 |
| June | 33.1° | 25.4° | 41.2mm | 4.6 | 66 |
| July | 33.4° | 25.5° | 32mm | 3.3 | 68 |
| August | 33.5° | 25.4° | 93.6mm | 6.6 | 61 |
| September | 33.2° | 25.1° | 136.8mm | 7.5 | 60 |
| October | 32.8° | 24.5° | 175.3mm | 10.3 | 56 |
| November | 32.4° | 23.9° | 93.6mm | 7.8 | 63 |
| December | 31.7° | 23° | 28.8mm | 5.1 | 71 |
January in Portmore averages a daily high of 31.3°C with nights around 22.3°C. Rain is rare — about 2.5 wet days and 10.3mm across the month. Comfortable conditions for being outdoors all day.
February in Portmore averages a daily high of 31.1°C with nights around 22.1°C. Expect roughly 3.6 wet days totalling 12.6mm. Comfortable conditions for being outdoors all day.
March in Portmore averages a daily high of 31.3°C with nights around 22.9°C. Expect roughly 3.4 wet days totalling 28.5mm. Comfortable conditions for being outdoors all day.
April in Portmore averages a daily high of 31.8°C with nights around 23.6°C. Expect roughly 3.3 wet days totalling 22.9mm. Generally workable, with some weather to plan around.
May in Portmore averages a daily high of 32.3°C with nights around 24.5°C. Expect roughly 6.4 wet days totalling 73.8mm. Generally workable, with some weather to plan around.
June in Portmore averages a daily high of 33.1°C with nights around 25.4°C. Expect roughly 4.6 wet days totalling 41.2mm. Generally workable, with some weather to plan around.
July in Portmore averages a daily high of 33.4°C with nights around 25.5°C. Expect roughly 3.3 wet days totalling 32mm. Generally workable, with some weather to plan around.
August in Portmore averages a daily high of 33.5°C with nights around 25.4°C. Expect roughly 6.6 wet days totalling 93.6mm. Generally workable, with some weather to plan around.
September in Portmore averages a daily high of 33.2°C with nights around 25.1°C. Expect roughly 7.5 wet days totalling 136.8mm. Generally workable, with some weather to plan around.
October in Portmore averages a daily high of 32.8°C with nights around 24.5°C. Expect roughly 10.3 wet days totalling 175.3mm. Generally workable, with some weather to plan around.
November in Portmore averages a daily high of 32.4°C with nights around 23.9°C. Expect roughly 7.8 wet days totalling 93.6mm. Generally workable, with some weather to plan around.
December in Portmore averages a daily high of 31.7°C with nights around 23°C. Expect roughly 5.1 wet days totalling 28.8mm. Generally workable, with some weather to plan around.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Portmore peaks at 78.
Based on 30 years of records, December–April scores highest for comfort in Portmore, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 33.5°C.
October is the wettest, averaging 175.3mm of rain across roughly 10.3 wet days.
February is the coolest month, with average daily highs around 31.1°C.