Adelaide Weather in September

During September, Adelaide experiences moderate daytime temperatures of 18°C (64°F) and cooler nights around 9°C (48°F). Expect quite a bit of rainfall. Around 61 mm (2.4 in) is typical.

Rainfall in Adelaide in September

Historically, September sees about 8 days of rain, with a monthly average of 61 mm (2.4 in). Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Adelaide in September

If you're visiting Adelaide in September, expect highs of 18°C (64°F) and overnight lows around 9°C (48°F). The difference between afternoon and evening temperatures is usually noticeable. Nights fall to 9°C (48°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.

Sunshine in Adelaide in September

With approximately 204 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.

Wind Speed in Adelaide 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

The water is 20°C (68°F) this month — a comfortable temperature that most swimmers enjoy. Warm enough to stay in without getting cold quickly.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. January, February, March, April, October, November and December typically offer the best weather for Adelaide.

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 Australia, check out our Adelaide's climate page.

Adelaide Temperature in September

Min Temperature 9°C (48°F)  

Max Temperature 18°C (64°F)  

Water Temperature 20°C (68°F)  

Chance of Rain 26%  

Precipitation 61 mm (2.4 in)  

Rainy days 8 days  

Humidity 51%  

Windspeed 5 m/s (10 knots)  

Sunshine 204 hours  

Percentage Sunshine 61%  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Adelaide typically stay consistent throughout September, with daily highs averaging around 18°C (64°F). Nights are cool, with lows typically ranging from 8°C (46°F) to 10°C (50°F).

Average temperatures in September

‹ Select year to compare to 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 ›

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

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

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

‹ Select year to compare to 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 ›

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 Adelaide in September

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

Historical weather Temperatures Precipitation

‹ 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 ›

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

Adelaide historical weather extremes in September

The extremes listed below come from historical weather data collected in Adelaide from 1976 through 2025.

• On September 26, 1987, temperatures climbed to 31°C (88°F), marking the warmest September day on record.
• The coldest September day was on September 17, 1984, with a maximum of 11°C (52°F).
• Nighttime temperatures dropped to 2°C (36°F) on September 11, 2002, marking the coldest September night on record.

What to Wear in Adelaide in September

Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. With water temperatures around 20°C (68°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Adelaide in September

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

Cycling

6/10

Walking

6/10

Camping

4/10

Outdoor sports

10/10

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 Australia, check out our Adelaide's climate page.

More climate data for Adelaide

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Adelaide climate overview or explore weather in Australia.