Weather in Auckland in September

How September compares

September is the 9th warmest month of the year in Auckland. Against London's average high of 18.6°C in September, Auckland is 3.5°C cooler by day and 1.1°C cooler at night.

Daytime and night-time in September

The typical September day in Auckland peaks at 15.1°C, but that is an average: the warmest 10% of days reach 17.1°C or more. Days over 25°C are rare. Nights average 10.1°C; one night in ten drops to 7.4°C or lower, so pack a layer for evenings - it is genuinely cool after dark. Between 1991 and 2020 the hottest September day here reached 20.4°C (1998-09-30) and the coldest night 4.1°C (1995-09-10).

Rain in September

Wet (more than 8 rainy days): about 14 days with 1 mm or more, 93 mm in total. Year to year it varies a lot - the wettest September was 1997 with 202 mm, the driest 2020 with 45 mm. Humidity averages 81%.

Sea temperature in September

The sea averages 13.9°C - too cold for most (under 18°c). Depending on the year it ranges from 12.9°C to 14.5°C. For the warmest sea here, come in February (21.2°C).

Sunshine and daylight

Around 4.7 hours of sunshine a day (estimated from cloud cover), 11.8 hours of daylight: the sun rises about 06:21 and sets about 18:12 local time in mid-September. Average cloud cover is 60%.

Is September a good time to visit Auckland?

September is not the strongest month here: mild days and frequent rain. The best months for Auckland on our scoring are February, January, March.

Comfortable for walking, cool for sitting outside

Auckland’s September temperatures suit being on the move better than spending long periods sitting outdoors. The average daytime high of 15.1°C is 3.5°C below London’s, so pack for cooler conditions than you might expect at home. A light jumper and a windproof outer layer give you more flexibility than summer clothing alone. Evenings need another layer, with average lows of 10.1°C and the coldest nights reaching 7.4°C or lower. Midday heat is not the main concern here; staying comfortable when you stop walking is more relevant. This suits travellers who prefer cool air to heat, provided warmth is not the reason for the trip.

Leave room to rearrange outdoor plans

Rain is the main compromise in September. About 14 days receive rain, so a waterproof jacket is more useful than relying on finding shelter when you need it. Keep outdoor plans movable and have an indoor alternative rather than making every day depend on dry weather. There is still useful time outside: Auckland averages about 4.7 hours of sunshine within 11.8 hours of daylight. That leaves room for outdoor activities, but it is not a promise of consistently bright skies. Choose this month if you are happy to adjust your day to conditions; it is less suitable if reliable sunshine is central to your holiday.

Plan for the coast, not warm-water swimming

The sea averages 13.9°C, making it cold rather than merely refreshing. Coastal time is better planned around being on shore than around casual swimming, especially when the air is also mild. Do not let a brighter afternoon lead you to expect warm water. The wider decision is about what you want from a long journey: the flight from London takes about 23 hours 42 minutes, yet September does not deliver a warm-weather payoff. It can still suit a visit where swimming and sunshine are secondary. If weather is your main reason for choosing dates, February, January and March are better-rated months.