| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 28.9° | 23.3° | 131mm | 9.8 | 73 |
| February | 29.9° | 24.1° | 126.9mm | 5.6 | 77 |
| March | 31.5° | 24.4° | 62.7mm | 4.2 | 74 |
| April | 33.9° | 25.3° | 46.6mm | 3.7 | 65 |
| May | 34.7° | 25.9° | 90.1mm | 5.4 | 58 |
| June | 35.2° | 26.2° | 17.6mm | 1.8 | 64 |
| July | 35° | 25.9° | 46.7mm | 4.4 | 59 |
| August | 35° | 25.2° | 60.9mm | 5.3 | 57 |
| September | 35° | 25.3° | 115.6mm | 6.6 | 55 |
| October | 32.9° | 24.2° | 254.2mm | 13.9 | 49 |
| November | 30.1° | 23.5° | 355.3mm | 19.6 | 58 |
| December | 29° | 23.7° | 388.7mm | 17.8 | 62 |
January in Trincomalee averages a daily high of 28.9°C with nights around 23.3°C. Expect roughly 9.8 wet days totalling 131mm. Generally workable, with some weather to plan around.
February in Trincomalee averages a daily high of 29.9°C with nights around 24.1°C. Expect roughly 5.6 wet days totalling 126.9mm. Comfortable conditions for being outdoors all day.
March in Trincomalee averages a daily high of 31.5°C with nights around 24.4°C. Expect roughly 4.2 wet days totalling 62.7mm. Generally workable, with some weather to plan around.
April in Trincomalee averages a daily high of 33.9°C with nights around 25.3°C. Expect roughly 3.7 wet days totalling 46.6mm. Generally workable, with some weather to plan around.
May in Trincomalee averages a daily high of 34.7°C with nights around 25.9°C. Expect roughly 5.4 wet days totalling 90.1mm. Generally workable, with some weather to plan around.
June in Trincomalee averages a daily high of 35.2°C with nights around 26.2°C. Rain is rare — about 1.8 wet days and 17.6mm across the month. Generally workable, with some weather to plan around.
July in Trincomalee averages a daily high of 35°C with nights around 25.9°C. Expect roughly 4.4 wet days totalling 46.7mm. Generally workable, with some weather to plan around.
August in Trincomalee averages a daily high of 35°C with nights around 25.2°C. Expect roughly 5.3 wet days totalling 60.9mm. Generally workable, with some weather to plan around.
September in Trincomalee averages a daily high of 35°C with nights around 25.3°C. Expect roughly 6.6 wet days totalling 115.6mm. Generally workable, with some weather to plan around.
October in Trincomalee averages a daily high of 32.9°C with nights around 24.2°C. Expect roughly 13.9 wet days totalling 254.2mm. Demanding conditions — pack for it and plan indoor options.
November in Trincomalee averages a daily high of 30.1°C with nights around 23.5°C. Expect roughly 19.6 wet days totalling 355.3mm. Generally workable, with some weather to plan around.
December in Trincomalee averages a daily high of 29°C with nights around 23.7°C. Expect roughly 17.8 wet days totalling 388.7mm. 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. Trincomalee peaks at 77.
Based on 30 years of records, January–March scores highest for comfort in Trincomalee, balancing daytime temperature against rainfall.
June is the warmest, averaging a daily high of 35.2°C.
December is the wettest, averaging 388.7mm of rain across roughly 17.8 wet days.
January is the coolest month, with average daily highs around 28.9°C.