The best time to visit Malaysian Borneo (Sabah, Sarawak) is Feb–Mar. It is the only stretch of the year — 2 months — rated go on both daytime heat and rainfall.
Heavy NE monsoon Nov–Feb
| Month | High °C | High °F | Rainy days | Verdict |
|---|---|---|---|---|
| January | 26.9 | 80 | 56% | Fair |
| February | 27.1 | 81 | 39% | Go |
| March | 27.9 | 82 | 42% | Go |
| April | 28.6 | 83 | 56% | Fair |
| May | 28.0 | 82 | 66% | Too wet |
| June | 27.3 | 81 | 71% | Too wet |
| July | 26.9 | 80 | 67% | Too wet |
| August | 27.0 | 81 | 72% | Too wet |
| September | 27.1 | 81 | 77% | Too wet |
| October | 26.9 | 80 | 84% | Too wet |
| November | 27.1 | 81 | 84% | Too wet |
| December | 27.0 | 81 | 77% | 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 39% of days and daytime highs near 27.1°C (81°F). October is the wettest, at 84%. Temperature barely moves all year — just 1.7°C between the warmest and coolest months — so rainfall, not heat, decides when to go. The record rules out too wet in May–Dec.