For Btumbawe :
No gale warning.
The reliability of the situation is good.
Skies changeable to very cloudy. Some showers from late morning. In the evening, good clear periods but lots of cloud, too.
Light showers progressively becoming less frequent. S wind force 3 continuing all day. Gusts reaching 18 knots from the middle of the day. Slight sea becoming moderate in the evening. Low, short swell from ESE. Visibility reduced by mist becoming excellent in the middle of the day then reduced by mist.