Phnom Penh Municipality Weather in September

Average temperatures, rainfall, sunshine and the best places to visit in Phnom Penh Municipality, Cambodia in September.

Thinking about venturing to Phnom Penh Municipality, Cambodia this September and curious about the weather conditions to expect? This page holds all the key information you seek, responding to your question:

What to Expect in Phnom Penh Municipality in September

Phnom Penh Municipality, Cambodia is a region in Cambodia. September in Phnom Penh Municipality generally has very warm temperatures, with heavy precipitation.

Temperatures

You can expect very warm maximum daytime temperatures of around 33°C (91°F) and nighttime temperatures around 25°C (77°F) in Phnom Penh. The temperatures mentioned for both day and night are typical averages. However some days might get even hotter. It's best to stay prepared by wearing cloths suitable for the warmth.

For a closer look at conditions across Phnom Penh Municipality, Cambodia, refer to the map below.

Precipitation

In September, precipitation varies across different areas. From heavy rainfall in Phumĭ Chrey Kaông with an average of 250 mm (9.8 in) to heavy rainfall in Stœ̆ng Méan Chey with 256 mm (10 in). Looking at the climate data spanning the last 30 years, this month sees the heaviest rainfall of the year in Phnom Penh.

Average sunshine

Sunshine is moderately available across various locations. In Phnom Penh, you can expect around 129 hours of sunlight in September, which gives a pleasant combination of sun and shade. For those who want maximum sunshine, our weather planner can point you toward the sunniest places on Earth.

Explore Phnom Penh Municipality by month

Pick a month to see the average temperature, rainfall and sunshine in Phnom Penh Municipality — and find the best time to visit. (based on Phnom Penh)

Best Places to Visit in Phnom Penh Municipality in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Phnom Penh Municipality.

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).

Popular Destinations in Phnom Penh Municipality

What is the weather like in September for some of the most popular destinations in Phnom Penh Municipality, Cambodia?

Temperature range in Phnom Penh Municipality (September)

Precipitation variation in Phnom Penh Municipality (September)

Phnom Penh

In September Phnom Penh generally has very high temperatures with maximum daytime temperatures around 33°C (91°F), minimum nighttime temperatures around 25°C (77°F) and heavy monthly rainfall. So on average the conditions are poor that month.

August
September
October
Max temperature
34°C (93°F)
33°C (91°F)
33°C (91°F)
Min temperature
26°C (79°F)
25°C (77°F)
25°C (77°F)
Monthly sun hours
175 hours
129 hours
205 hours
Monthly rainfall
172 mm (6.8 in)
252 mm (9.9 in)
247 mm (9.7 in)
Monthly rainy days
17 days
19 days
17 days
Weather conditions

Phumĭ Bayab

In September Phumĭ Bayab generally has very high temperatures with maximum daytime temperatures around 33°C (91°F), minimum nighttime temperatures around 25°C (77°F) and heavy monthly rainfall. So on average the conditions are poor that month.

August
September
October
Max temperature
34°C (93°F)
33°C (91°F)
33°C (91°F)
Min temperature
26°C (79°F)
25°C (77°F)
25°C (77°F)
Monthly sun hours
175 hours
129 hours
205 hours
Monthly rainfall
175 mm (6.9 in)
256 mm (10 in)
245 mm (9.6 in)
Monthly rainy days
17 days
19 days
17 days
Weather conditions

Phumĭ Chrey Kaông

In September Phumĭ Chrey Kaông generally has very high temperatures with maximum daytime temperatures around 33°C (91°F), minimum nighttime temperatures around 25°C (77°F) and heavy monthly rainfall. So on average the conditions are poor that month.

August
September
October
Max temperature
34°C (93°F)
33°C (91°F)
33°C (91°F)
Min temperature
26°C (79°F)
25°C (77°F)
25°C (77°F)
Monthly sun hours
175 hours
129 hours
205 hours
Monthly rainfall
170 mm (6.7 in)
250 mm (9.8 in)
248 mm (9.8 in)
Monthly rainy days
17 days
19 days
17 days
Weather conditions

Stœ̆ng Méan Chey

In September Stœ̆ng Méan Chey generally has very high temperatures with maximum daytime temperatures around 33°C (91°F), minimum nighttime temperatures around 25°C (77°F) and heavy monthly rainfall. So on average the conditions are poor that month.

August
September
October
Max temperature
34°C (93°F)
33°C (91°F)
33°C (91°F)
Min temperature
26°C (79°F)
25°C (77°F)
25°C (77°F)
Monthly sun hours
175 hours
129 hours
205 hours
Monthly rainfall
176 mm (6.9 in)
256 mm (10 in)
248 mm (9.8 in)
Monthly rainy days
17 days
19 days
17 days
Weather conditions

Is your destination not in the list? Have a look at all destinations in Phnom Penh Municipality, in Cambodia.

In our records: Cambodia September extremes

Notable September records observed across cities in Cambodia in our climate database (1976 – 2026). Historic readings can vary in quality, so treat these as illustrative.

  • From our sources, the wettest September day in Cambodia brought 301 mm (12 in) in Sihanoukville on September 23, 2006.

Popular cities in September

Day & night temperatures, rainfall and average weather in Phnom Penh Municipality in September.

City Weather Day temp Night temp Rainfall
Phnom Penh 33°C (91°F) 25°C (77°F) 252 mm (9.9 in)
Phumĭ Bayab 33°C (91°F) 25°C (77°F) 256 mm (10 in)
Phumĭ Chrey Kaông 33°C (91°F) 25°C (77°F) 250 mm (9.8 in)
Stœ̆ng Méan Chey 33°C (91°F) 25°C (77°F) 256 mm (10 in)

Phnom Penh Municipality weather in September: frequently asked questions

What is the weather like in Phnom Penh Municipality, Cambodia in September?

September in Phnom Penh Municipality, Cambodia brings poor weather. In Phnom Penh, daytime temperatures are typically around 33°C (91°F) and nighttime lows hover near 25°C (77°F).

What is the average temperature in Phnom Penh Municipality, Cambodia in September?

Average temperatures in Phnom Penh Municipality, Cambodia during September range from a nighttime low near 25°C (77°F) to a daytime high around 33°C (91°F) in Phnom Penh.

Does Phnom Penh Municipality, Cambodia get a lot of rain in September?

Rainfall in Phnom Penh Municipality, Cambodia peaks during September. Phnom Penh averages roughly 252 mm (9.9 in), so frequent and sometimes heavy showers are the norm.

Is September a Good Time to Visit Phnom Penh Municipality, Cambodia?

Given the typically poor weather conditions in Phnom Penh, September may not be the ideal time to visit Phnom Penh Municipality, Cambodia.

Generally speaking, December provides tolerable weather in Phnom Penh. On the other hand, the months of January, February, March, April, May, June, July, August, September and October tend to have poor weather conditions.

Interested in more climate information?

We have much more information about the climate in Phnom Penh Municipality.

Weather and climate has detailed information for every country in the world. Are you going to Cambodia? Get detailed historical weather averages for many cities in Cambodia.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

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