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Hamilton Weather in September

In Hamilton, September brings moderate daytime temperatures around 17°C (63°F), with nights cooling to 8°C (46°F). Expect quite a bit of rainfall this month.

Rainfall in Hamilton in September

You can expect rain on around 17 days based on historical patterns, with 124 mm (4.9 in) average for the month. Wet weather is a regular and significant part of this month. Frequent days of rain combined with high totals means proper waterproofs are worth packing.

Temperature in Hamilton in September

September in Hamilton brings typical temperatures with highs around 17°C (63°F) and lows of 8°C (46°F). Conditions are often most pleasant around the middle of the day. With overnight lows of 8°C (46°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.

Sunshine in Hamilton in September

The month experiences a moderate amount of sunlight, with 148 hours of sunshine. This provides a nice balance between sunshine and clouds.

September in Hamilton has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.

Hamilton Temperature in September

Min Temperature

8°C (46°F)

Max Temperature

17°C (63°F)

Chance of Rain

56%

Precipitation

124 mm (4.9 in)

Rainy days

17 days

Humidity

83%

Sunshine

148 hours

Percentage Sunshine

Hamilton Weather by Month

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

January

25°C (77°F)View January → February

25°C (77°F)View February → March

23°C (73°F)View March → April

21°C (70°F)View April → May

18°C (64°F)View May → June

16°C (61°F)View June → July

15°C (59°F)View July → August

16°C (61°F)View August → September

17°C (63°F)View September → This monthOctober

18°C (64°F)View October → November

20°C (68°F)View November → December

22°C (72°F)View December →

Best Time to Visit Hamilton →

Historical weather records for Hamilton in September

Browse day-by-day weather records for Hamilton spanning 23 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Hamilton historical weather extremes in September

Our historical data for Hamilton spans 2006 to 2026, revealing these weather extremes.

On September 21, 2023, temperatures climbed to 23°C (73°F), marking the warmest September day on record.
On September 5, 2022, Hamilton saw its coldest September day with temperatures maxing out at 10°C (50°F).
Hamilton registered its coldest September night on September 6, 2009, with temperatures dropping to -3°C (27°F).
Peak precipitation in September occurred on September 23, 2021, when 62 mm (2.4 in) of precipitation was measured.

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 Hamilton in September

Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.