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Oamaru Weather in September

September in Oamaru brings moderate temperatures around 13°C (55°F) during the day, dropping to 6°C (43°F) at night, with the driest conditions of the year.

Rainfall in Oamaru in September

Dry conditions dominate this month. A good time for outdoor fun and exploration, even if the temperatures are on the cool side. You can typically expect 9 days of rain this month, averaging around 53 mm (2.1 in). The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.

Temperature in Oamaru in September

Oamaru in September gets highs of 13°C (55°F) during the day and drops to 6°C (43°F) at night. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With overnight lows of 6°C (43°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.

If you prefer enjoying temperate temperatures and rain-free days, January and February typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

Oamaru Temperature in September

Min Temperature

6°C (43°F)

Max Temperature

13°C (55°F)

Chance of Rain

30%

Precipitation

53 mm (2.1 in)

Rainy days

9 days

Oamaru Weather by Month

Pick a month to see the average temperature, rainfall and sunshine in Oamaru - and find the best time to visit.

January

18°C (64°F)View January → February

18°C (64°F)View February → March

17°C (63°F)View March → April

15°C (59°F)View April → May

13°C (55°F)View May → June

11°C (52°F)View June → July

10°C (50°F)View July → August

11°C (52°F)View August → September

13°C (55°F)View September → This monthOctober

14°C (57°F)View October → November

15°C (59°F)View November → December

17°C (63°F)View December →

Best Time to Visit Oamaru →

Daily Historical Temperatures

46-year average (1976-2025)

Based on our historical records, temperatures in Oamaru typically stay consistent throughout September, with daily highs averaging around 13°C (55°F). Nights are cold, with lows around 6°C (43°F).

Average temperatures in September

Historical weather records for Oamaru in September

Browse day-by-day weather records for Oamaru spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Oamaru historical weather extremes in September

Based on weather observations in Oamaru between 2006 and 2026, these are the recorded extremes during September.

Oamaru recorded its highest September temperature of 25°C (77°F) on September 20, 2023.
On September 13, 2024, Oamaru saw its coldest September day with temperatures maxing out at 6°C (43°F).
Oamaru registered its coldest September night on September 6, 2022, with temperatures dropping to -1°C (30°F).
The wettest day in September Oamaru was on September 18, 2017 with 28 mm (1.1 in) of precipitation.

Best Places in New Zealand in September

Find out more about the weather in New Zealand and which places have the best travel conditions in this month. See all of New Zealand in September →

Conditions Temperatures Precipitation

Temperatures Precipitation

perfect weather

pleasant

tolerable

unpleasant

poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Marker color shows the average daytime high temperature in September: blue is cold, red is hot.

Marker color shows total monthly precipitation in September: pale blue is dry, deep blue is wet.

What to Wear in Oamaru in September

The weather can be unpredictable in September, so pack clothes you can easily mix and match. You could bring jeans, other long pants, and a few t-shirts. A light jacket or light sweater will be pleasant for the cooler moments. Rain is likely on several days, so bring a good rain jacket.