Pierre Weather in September
Pierre in September sees high temperatures, with highs around 25°C (77°F) and overnight lows of 10°C (50°F). Overall perfect conditions make it one of the better months to visit.
Rainfall in Pierre in September
The climate data from previous years indicates about 7 days of rain, averaging 40 mm (1.6 in) for the month. A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.
Temperature in Pierre in September
September in Pierre is generally perfect, with days reaching 25°C (77°F) and nights settling around 10°C (50°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights drop to 10°C (50°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Pierre's climate page.
Pierre Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
25°C (77°F)
Chance of Rain
23%
Precipitation
40 mm (1.6 in)
Rainy days
7 days
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Pierre typically drop from around 29°C (84°F) at the start of September to approximately 23°C (73°F) by the end. Nights are cool, with lows typically ranging from 8°C (46°F) to 15°C (59°F).
Average temperatures in September
Historical weather for Pierre in September
Browse day-by-day weather records for Pierre spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Pierre historical weather extremes in September
Based on 48 years of weather observations in Pierre between 1977 and 2025, these are the recorded extremes.
- On September 2, 1983, temperatures climbed to 42°C (108°F), marking the warmest September day on record.
- Nighttime temperatures dropped to -4°C (25°F) on September 22, 1995, marking the coldest September night on record.
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Pierre in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Some rain is possible, so pack something to handle light showers.What To Do in Pierre in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Pierre's climate page.
See the full Pierre climate overview or explore weather in the United States of America.
