| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 26.7° | 16.7° | 110.3mm | 11.2 | 78 |
| February | 27.2° | 16.6° | 96.1mm | 10.9 | 77 |
| March | 27.8° | 16.6° | 139.4mm | 12.2 | 72 |
| April | 28.6° | 17.5° | 194.1mm | 13.5 | 67 |
| May | 29.7° | 19° | 261mm | 15.6 | 59 |
| June | 30.7° | 19.9° | 170.7mm | 13 | 59 |
| July | 30.7° | 20.3° | 179.4mm | 15.5 | 55 |
| August | 30.5° | 20.4° | 243.6mm | 16.2 | 56 |
| September | 30.5° | 20.2° | 260.8mm | 16.5 | 56 |
| October | 29.8° | 19.8° | 218.6mm | 17.3 | 59 |
| November | 28.2° | 19.1° | 197.1mm | 15.6 | 65 |
| December | 27° | 17.8° | 119.1mm | 13.7 | 73 |
January in Arecibo averages a daily high of 26.7°C with nights around 16.7°C. Expect roughly 11.2 wet days totalling 110.3mm. Comfortable conditions for being outdoors all day.
February in Arecibo averages a daily high of 27.2°C with nights around 16.6°C. Expect roughly 10.9 wet days totalling 96.1mm. Comfortable conditions for being outdoors all day.
March in Arecibo averages a daily high of 27.8°C with nights around 16.6°C. Expect roughly 12.2 wet days totalling 139.4mm. Generally workable, with some weather to plan around.
April in Arecibo averages a daily high of 28.6°C with nights around 17.5°C. Expect roughly 13.5 wet days totalling 194.1mm. Generally workable, with some weather to plan around.
May in Arecibo averages a daily high of 29.7°C with nights around 19°C. Expect roughly 15.6 wet days totalling 261mm. Generally workable, with some weather to plan around.
June in Arecibo averages a daily high of 30.7°C with nights around 19.9°C. Expect roughly 13 wet days totalling 170.7mm. Generally workable, with some weather to plan around.
July in Arecibo averages a daily high of 30.7°C with nights around 20.3°C. Expect roughly 15.5 wet days totalling 179.4mm. Generally workable, with some weather to plan around.
August in Arecibo averages a daily high of 30.5°C with nights around 20.4°C. Expect roughly 16.2 wet days totalling 243.6mm. Generally workable, with some weather to plan around.
September in Arecibo averages a daily high of 30.5°C with nights around 20.2°C. Expect roughly 16.5 wet days totalling 260.8mm. Generally workable, with some weather to plan around.
October in Arecibo averages a daily high of 29.8°C with nights around 19.8°C. Expect roughly 17.3 wet days totalling 218.6mm. Generally workable, with some weather to plan around.
November in Arecibo averages a daily high of 28.2°C with nights around 19.1°C. Expect roughly 15.6 wet days totalling 197.1mm. Generally workable, with some weather to plan around.
December in Arecibo averages a daily high of 27°C with nights around 17.8°C. Expect roughly 13.7 wet days totalling 119.1mm. 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. Arecibo peaks at 78.
Based on 30 years of records, December–March scores highest for comfort in Arecibo, balancing daytime temperature against rainfall.
June is the warmest, averaging a daily high of 30.7°C.
May is the wettest, averaging 261mm of rain across roughly 15.6 wet days.
January is the coolest month, with average daily highs around 26.7°C.