Vanuatu weather by month

In Port Vila, the average share of the sky covered by clouds shows moderate seasonal variation over the course of the year.

The clearer part of the year begins around July 9 and lasts for 5.8 months, ending around January 1. The clearest month is October, when the sky is clear, mostly clear, or partly cloudy 57% of the time on average.

The cloudier part of the year begins around January 2 and lasts for 3.5 months, ending around April 17. The cloudiest month is March, when it is overcast or mostly cloudy 59% of the time.

This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.

Across the year, average wind speed in Port Vila is typically breezy, near 25 km/h, and varies moderately with the seasons.

The windier part of the year lasts 6.9 months, from around Apr 26 to Nov 20. The windiest month is August, averaging about 28 km/h (breezy).

The calmer part of the year runs from around Nov 21 to Apr 25, with February the calmest month at about 22 km/h.

Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.

Port Vila receives about 5.3 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 3.5 and 7.0 kWh/m².

The brighter stretch of the year lasts 6.2 months, from around Sep 18 to Mar 26. The brightest month is December, averaging about 6.8 kWh/m² (intense).

The dimmest month is June, down near 3.6 kWh/m² — roughly 46% less than the December peak.