Weather in Invercargill in January

Shoulder season. January sits in between. You will get good days and you will lose some. You should expect rain on 17 days of the month, which is more days wet than dry.

January ranks 2 of 12 in Invercargill. Only February scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain on 17 days, 3 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 17 °C days and 11.5 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: the day barely swings — 5.5 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest January day reached 26.6 °C and the coldest night fell to 7.5 °C, and the wettest single day dropped 49 mm — roughly 42% of the month's rain in one day.

January is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest January on record still delivered 187 mm against 40 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 116 mm average is a reasonable planning figure, not a promise.

Wind is light at 15.9 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 78%, high enough to notice on the warm days without dominating them.

How January sits in the year

Temperatures hold steady either side: 16.1 °C in December, 17 here, 17.1 in February. Nothing about the timing within the month matters much.

Daylight in January

January is at or near the longest days of Invercargill's year: 15.4 hours of daylight, losing 0.9 hours across the month. Evenings are the real gain — dinner outdoors still happens in full light.

Sea temperature

The sea sits at about 12.3 °C in January — too cold to swim without a wetsuit. This is the warmest the water gets all year.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead. If the dates are flexible, April is the trade worth considering — 13 points weaker on weather, and materially quieter.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

January in Invercargill versus nearby

If Invercargill is one option among several, the nearby comparison is worth making. Papatowai is a better bet in January — within a degree on temperature, 2 days less rain. Te Anau is close enough to be a coin toss — within a degree on temperature, 2 days more rain.

So: January is effectively as good as it gets here — 4 points behind February, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Invercargill

See all twelve months in Invercargill, or where else to go in January.