Semarang is warmest in September, averaging 34° by day and 23° at night. The wettest month is February with 400 mm, and the year brings about 2419 mm in total.
Month by month
| Month | High | Low | Rain | Sea | Daylight | Good for |
|---|---|---|---|---|---|---|
| January | 29° | 24° | 295 mm | 30° | 12.4 h | Rainy season |
| February | 29° | 24° | 400 mm | 29° | 12.2 h | Rainy season |
| March | 29° | 24° | 260 mm | 30° | 12.0 h | Rainy season |
| April | 30° | 24° | 195 mm | 30° | 11.8 h | Rainy season |
| May | 30° | 24° | 124 mm | 30° | 11.7 h | Mild |
| June | 30° | 23° | 150 mm | 29° | 11.6 h | Mild |
| July | 30° | 22° | 74 mm | 29° | 11.6 h | Beach weather |
| August | 32° | 22° | 56 mm | 29° | 11.8 h | Beach weather |
| September | 34° | 23° | 129 mm | 29° | 12.0 h | Mild |
| October | 33° | 25° | 146 mm | 30° | 12.2 h | Mild |
| November | 31° | 25° | 246 mm | 30° | 12.3 h | Rainy season |
| December | 30° | 25° | 344 mm | 30° | 12.4 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: July and August — highs around 31°, nights no colder than 22°, and at most 74 mm of rain in a month. The sea sits at 29–29° then.
Wet season: January, February, March, April, November and December — up to 400 mm in a single month.