| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 30.8° | 23.3° | 49.5mm | 5.6 | 74 |
| February | 31.3° | 23.5° | 56.4mm | 5.4 | 72 |
| March | 32° | 24.2° | 52.7mm | 5 | 70 |
| April | 31.8° | 25.2° | 66.2mm | 7.4 | 66 |
| May | 31.1° | 25.8° | 88.5mm | 9.8 | 64 |
| June | 31° | 25.3° | 37.1mm | 9.7 | 65 |
| July | 31.7° | 25.1° | 32.5mm | 6.4 | 68 |
| August | 31.1° | 24.9° | 67.1mm | 8.1 | 67 |
| September | 30.5° | 24.8° | 129mm | 12.3 | 61 |
| October | 30.9° | 24.6° | 147.6mm | 13.3 | 58 |
| November | 30.6° | 24° | 168mm | 14.2 | 57 |
| December | 30.4° | 23.5° | 174.7mm | 13.8 | 59 |
January in Ambalantota averages a daily high of 30.8°C with nights around 23.3°C. Expect roughly 5.6 wet days totalling 49.5mm. Generally workable, with some weather to plan around.
February in Ambalantota averages a daily high of 31.3°C with nights around 23.5°C. Expect roughly 5.4 wet days totalling 56.4mm. Generally workable, with some weather to plan around.
March in Ambalantota averages a daily high of 32°C with nights around 24.2°C. Expect roughly 5 wet days totalling 52.7mm. Generally workable, with some weather to plan around.
April in Ambalantota averages a daily high of 31.8°C with nights around 25.2°C. Expect roughly 7.4 wet days totalling 66.2mm. Generally workable, with some weather to plan around.
May in Ambalantota averages a daily high of 31.1°C with nights around 25.8°C. Expect roughly 9.8 wet days totalling 88.5mm. Generally workable, with some weather to plan around.
June in Ambalantota averages a daily high of 31°C with nights around 25.3°C. Expect roughly 9.7 wet days totalling 37.1mm. Generally workable, with some weather to plan around.
July in Ambalantota averages a daily high of 31.7°C with nights around 25.1°C. Expect roughly 6.4 wet days totalling 32.5mm. Generally workable, with some weather to plan around.
August in Ambalantota averages a daily high of 31.1°C with nights around 24.9°C. Expect roughly 8.1 wet days totalling 67.1mm. Generally workable, with some weather to plan around.
September in Ambalantota averages a daily high of 30.5°C with nights around 24.8°C. Expect roughly 12.3 wet days totalling 129mm. Generally workable, with some weather to plan around.
October in Ambalantota averages a daily high of 30.9°C with nights around 24.6°C. Expect roughly 13.3 wet days totalling 147.6mm. Generally workable, with some weather to plan around.
November in Ambalantota averages a daily high of 30.6°C with nights around 24°C. Expect roughly 14.2 wet days totalling 168mm. Generally workable, with some weather to plan around.
December in Ambalantota averages a daily high of 30.4°C with nights around 23.5°C. Expect roughly 13.8 wet days totalling 174.7mm. 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. Ambalantota peaks at 74.
Based on 30 years of records, January–April scores highest for comfort in Ambalantota, balancing daytime temperature against rainfall.
March is the warmest, averaging a daily high of 32°C.
December is the wettest, averaging 174.7mm of rain across roughly 13.8 wet days.
December is the coolest month, with average daily highs around 30.4°C.