Niue weather by month

In Alofi, 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 March 29 and lasts for 6.5 months, ending around October 13. The clearest month is August, when the sky is clear, mostly clear, or partly cloudy 54% of the time on average.

The cloudier part of the year begins around October 14 and lasts for 5.5 months, ending around March 28. The cloudiest month is January, when it is overcast or mostly cloudy 63% 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 Alofi is typically breezy, near 24 km/h, and varies moderately with the seasons.

The windier part of the year lasts 6.4 months, from around Apr 23 to Nov 4. The windiest month is September, averaging about 26 km/h (breezy).

The calmer part of the year runs from around Nov 5 to Apr 22, with March the calmest month at about 21 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.

Alofi receives about 5.2 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 3.7 and 6.6 kWh/m².

The brighter stretch of the year lasts 6.7 months, from around Sep 14 to Apr 4. The brightest month is December, averaging about 6.5 kWh/m² (intense).

The dimmest month is June, down near 3.7 kWh/m² — roughly 43% less than the December peak.