Get out your umbrellas and raincoats as a trough of low pressure with associated cloud and rain over Fiji is slowly moving eastwards over the group.

The Nadi Weather Office said to expect periods of rain, heavy at times and a few squally thunderstorms.

For mariners, a strong wind warning is now in force for Southwest Viti Levu, Kadavu and the Vatu-I-Ra passages, Koro Sea and Southern Lau Waters.

The weather office said a trough of low pressure with associated cloud and rain over Fiji is slowly moving eastwards over the group.