Medan is warmest in May, averaging 30° by day and 24° at night. The wettest month is December with 288 mm, and the year brings about 2088 mm in total.
Month by month
| Month | High | Low | Rain | Sea | Daylight | Good for |
|---|---|---|---|---|---|---|
| January | 28° | 23° | 180 mm | 29° | 11.8 h | Mild |
| February | 29° | 23° | 112 mm | 30° | 11.9 h | Mild |
| March | 30° | 23° | 130 mm | 30° | 12.0 h | Mild |
| April | 30° | 24° | 90 mm | 30° | 12.1 h | Beach weather |
| May | 30° | 24° | 143 mm | 31° | 12.2 h | Mild |
| June | 30° | 23° | 159 mm | 30° | 12.2 h | Mild |
| July | 30° | 23° | 115 mm | 30° | 12.2 h | Mild |
| August | 29° | 23° | 198 mm | 30° | 12.1 h | Rainy season |
| September | 29° | 23° | 198 mm | 30° | 12.0 h | Rainy season |
| October | 29° | 23° | 205 mm | 30° | 11.9 h | Rainy season |
| November | 29° | 23° | 270 mm | 30° | 11.8 h | Rainy season |
| December | 28° | 23° | 288 mm | 29° | 11.8 h | Rainy season |
High and low are average daily maximum and minimum, rain is typical monthly total, sea is the average surface temperature, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER and NOAA MUR — averages, not promises.
When to go
Beach weather: April — highs around 30°, nights no colder than 24°, and at most 90 mm of rain in a month. The sea sits at 30–30° then.
Wet season: August, September, October, November and December — up to 288 mm in a single month.