Phnom Penh Weather in September
September in Phnom Penh averages 33°C (91°F) during the day and 25°C (77°F) at night. It is the wettest month of the year, with 252 mm (9.9 in) of rainfall on average, so waterproof gear is a must.
Rainfall in Phnom Penh in September
As part of the rainy season, Phnom Penh sees around 19 days of rain in September, with an average of 252 mm (9.9 in). Rainfall this month is frequent and tends to be fairly heavy when it does fall. Packing waterproofs is a good idea.
Temperature in Phnom Penh in September
Temperatures in Phnom Penh in September top out at 33°C (91°F) and drop to 25°C (77°F) overnight. For most visitors, the main thing to prepare for is the heat during the day. At 25°C (77°F) overnight, it stays warm after dark. Light, breathable clothing and good airflow in your room make a noticeable difference.
Sunshine in Phnom Penh in September
The month experiences a moderate amount of sunlight, with 129 hours of sunshine. This provides a nice balance between sunshine and rain.
Wind Speed in Phnom Penh in September
Average wind conditions reach 2 m/s (4 knots) in September. This creates comfortable weather with light winds that gently move vegetation. Keep in mind this is an average. Daily conditions range from near-calm to more noticeable wind.If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit Phnom Penh. Our weather planner can help you explore destinations with more pleasant weather conditions.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Cambodia, check out our Phnom Penh's climate page.
Phnom Penh Temperature in September
Min Temperature
25°C (77°F)
Max Temperature
33°C (91°F)
Chance of Rain
64%
Precipitation
252 mm (9.9 in)
Rainy days
19 days
Humidity
84%
Windspeed
2 m/s (4 knots)
Sunshine
129 hours
Percentage Sunshine
Historical weather for Phnom Penh in September
Browse day-by-day weather records for Phnom Penh spanning 38 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Phnom Penh historical weather extremes in September
Based on weather observations in Phnom Penh between 2005 and 2025, these are the recorded extremes during September.
- The warmest day in September was on September 30, 2019, with a maximum of 39°C (102°F).
- The lowest daytime temperature in September was 27°C (81°F), recorded on September 23, 2011.
- The coldest night in September in Phnom Penh was on September 14, 2022, with a minimum of 19°C (66°F).
Best Places in Cambodia in September
Find out more about the weather in Cambodia and which places have the best travel conditions in this month. See all of Cambodia in September →
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What to Wear in Phnom Penh in September
Get ready for hot weather in September! Lightweight, breathable fabrics are your best friend during this month. Cotton and linen shirts, shorts, sundresses, and sandals will keep you comfortable. Light colors help reflect the heat, avoid wearing black. Also bring a poncho, it will rain a lot! Waterproof everything you can. Sunglasses could come in handy during the sunnier parts of your trip.What To Do in Phnom Penh 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 Cambodia, check out our Phnom Penh's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Phnom Penh climate overview or explore weather in Cambodia.
