Month × Activity Grid

Fiji runs on a clean two-season rhythm. From May to October the trade winds push cooler, less humid air down from the south, the rain eases, and visibility underwater is at its annual best. From November to April the south-east trades collapse, tropical lows come in from the north, and the islands cycle through hot humid weeks broken by thunderstorms.

The dry season isn't just more pleasant — it changes what activities work. Manta rays aggregate at cleaner sites. Humpback whales migrate up from the Antarctic and use Fiji as a nursery from July through September. Diving visibility climbs to 30–40 m on the southern reefs (Beqa, Pacific Harbour) when runoff from the wet season is over. Cyclones are technically possible in any month but are concentrated Jan–Mar, with secondary risk Nov–Dec and Apr–May.

The grid's numeric score is a 1–10 quality rating, not a busy-day signal. A "10" diving month means visibility, current and surface conditions all stack. A "3" surfing month means the swell has flattened or shifted away from the reefs that break clean. The colour bands are: green 9–10, lime 7–8, amber 4–6, red 1–3.

A subtle thing worth knowing: the southern islands (Beqa, Kadavu, southern Viti Levu) hold dry weather about two weeks longer into the wet season than the north. If you're forced to travel in November, Savusavu and Taveuni are a smarter bet than the Mamanucas. The northern wet-season rainfall can be 60–80% higher than the south.

• Scores reflect average conditions across a decade of data, not the actual weather on the date you'll be there. A "10" March week can still drown you, a "3" October day can still go glassy.
• Surf ratings are anchored to Cloudbreak. Restaurants and Frigates Passage break differently; some breaks (e.g. Wilkes, Pipe) are workable outside the Cloudbreak sweet spot.
• Manta rays are tracked at specific cleaning stations (e.g. Manta Reef at Namena Marine Park). A green manta cell doesn't mean you'll see them every dive; aggregation is daily.
• Humpback whale sightings are probabilistic, not guaranteed. Sounders are best off the Lomaiviti corridor and around Taveuni in Aug–Sep.
• Snorkel ratings assume reef-protected sites (e.g. Mamanuca lagoon). Open-ocean snorkelling is a separate risk conversation.
• Village stay / sevusevu is a year-round activity, but wet-season mud can make inland village access very difficult.
• Cyclone season is not a hard off-switch — Fiji gets Category 3+ systems roughly every other year. The score averages that; always check the active forecast.