New Plymouth Weather in September

In New Plymouth, September brings moderate daytime temperatures around 15°C (59°F), with nights cooling to 10°C (50°F). This month falls within the rainy season, so expect frequent rainfall.

Rainfall in New Plymouth in September

As part of the rainy season, New Plymouth sees around 15 days of rain in September, with an average of 178 mm (7 in). With rain on many days and solid totals, showers are frequent and often moderately heavy. Waterproof gear is a sensible idea.

Temperature in New Plymouth in September

Daytime temperatures in New Plymouth reach 15°C (59°F) in September, dropping to 10°C (50°F) at night. Even when the weather is stable, mornings and evenings can still feel distinctly cool. At 10°C (50°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.

Sunshine in New Plymouth in September

The month experiences a moderate amount of sunlight, with 166 hours of sunshine. This provides a nice balance between sunshine and rain.

Wind Speed in New Plymouth in September

Wind speeds average 5 m/s (10 knots) during September. At this speed, gentle to moderate breezes make small trees sway and the wind creates whitecaps on water bodies. Daily variations range from moderate winds to stronger breezes, creating excellent conditions for sailing, kite flying and wind sports.

Average water temperature in September

At 14°C (57°F), the water is cool but manageable for those who don't mind a bit of a shock getting in. Most people adjust after a few minutes.

If your ideal day consists of dry skies and pleasant temperatures, January, February and March typically offer the best circumstances for New Plymouth.

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• January
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For a detailed overview over the year and the best time to visit New Zealand, check out our New Plymouth's climate page.

New Plymouth Temperature in September

Min Temperature 10°C (50°F)  

Max Temperature 15°C (59°F)  

Water Temperature 14°C (57°F)  

Chance of Rain 50%  

Precipitation 178 mm (7 in)  

Rainy days 15 days  

Humidity 82%  

Windspeed 5 m/s (10 knots)  

Sunshine 166 hours  

Percentage Sunshine 48%  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in New Plymouth typically stay consistent throughout September, with daily highs averaging around 15°C (59°F). Nights are cool, with lows around 9°C (48°F).

Average temperatures in September

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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

‹ January February March April May June July August September October November December ›

Historical weather for New Plymouth in September

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

Historical weather Temperatures Precipitation

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‹ January February March April May June July August September October November December ›

New Plymouth historical weather extremes in September

Based on weather observations in New Plymouth between 1976 and 2025, these are the recorded extremes during September.

• The warmest day in September was on September 9, 1989, with a maximum of 21°C (70°F).
• The coldest September day was on September 25, 2000, with a maximum of 8°C (46°F).
• The lowest overnight temperature recorded in September was -1°C (30°F) (September 13, 2012).

What to Wear in New Plymouth 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. Also bring a poncho, it will rain a lot! Waterproof everything you can. With water temperatures around 14°C (57°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.

What To Do in New Plymouth in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

5/10

Cycling

5/10

Walking

5/10

Camping

3/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit New Zealand, check out our New Plymouth's climate page.

More climate data for New Plymouth

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full New Plymouth climate overview or explore weather in New Zealand.