For Btumbawe :
No gale warning.
The reliability of the situation is very good.
Very cloudy in the morning, changeable skies becoming relatively cloud-free in the afternoon. Risk of some spots of rain in the morning, no precipitation in the afternoon. In the evening, light cloudy spells.
S wind force 3 continuing all day. Gusts reaching 17 knots in the middle of the day. Slight sea. Low, short swell from SE. Good visibility becoming excellent in the middle of the day then good.