The best time to visit Sri Lanka is Jan–Feb. It is the only stretch of the year — 2 months — rated go on both daytime heat and rainfall.
Two monsoons split the island
| Month | High °C | High °F | Rainy days | Verdict |
|---|---|---|---|---|
| January | 29.4 | 85 | 36% | Go |
| February | 30.6 | 87 | 33% | Go |
| March | 31.5 | 89 | 46% | Fair |
| April | 30.4 | 87 | 83% | Too wet |
| May | 29.2 | 85 | 81% | Too wet |
| June | 28.3 | 83 | 79% | Too wet |
| July | 27.9 | 82 | 64% | Too wet |
| August | 28.0 | 82 | 62% | Too wet |
| September | 28.2 | 83 | 73% | Too wet |
| October | 28.2 | 83 | 85% | Too wet |
| November | 28.5 | 83 | 83% | Too wet |
| December | 28.7 | 84 | 62% | Too wet |
Verdict combines mean daytime high with rainy-day frequency. “Rainy days” is the share of days in the month with at least 1 mm of rain.
February is the driest month, with rain on 33% of days and daytime highs near 30.6°C (87°F). October is the wettest, at 85%. Temperature barely moves all year — just 3.6°C between the warmest and coolest months — so rainfall, not heat, decides when to go. The record rules out too wet in Apr–Dec.