Country Overview For Cambodia
The climate in Cambodia is typically tropical; rainy, monsoon season (May to November); dry season (December to April); little seasonal temperature variation. The terrain: mostly low, flat plains; mountains in southwest and north. For Phnum Penh in January the daily average maximum temperatures is 31°C with the average minimum 23°C, while in June the average maximum is 33°C with a minimum of 26°C. The wettest month for Phnum Penh is October with an average of 65.8mm of precipitation falling while the driest month is April with 0.0mm falling.
HISTORICAL MONTHLY AVERAGES FOR SEPTEMBER
The information presented below gives detailed historical monthly average weather conditions along with exceptional weather occurrences. To maintain relevance to current weather trends the displayed information has been calculated using data collected over the past two decades. The climate profile is taken from closest available data source to Poipet.
Temperature
Throughout the month of September daytime temperatures will generally reach highs of around 32°C that's about 90°F. At night the average minimum temperature drops down to around 24°C, that's 76°F.
In recent times the highest recorded temperature in September has been 36°C that's 96°F, with the lowest recorded temperature 21°C, about 70°F.
Relative Humidity
The average daily relative humidity for September is around 81%.
Heat Index
The Heat Index is a measure of how hot it feels when relative humidity is added to actual air temperature. From this a comfort level is calculated providing categories on how heat conditions might adversely affect someone.
Comfort Levels: Given average maximum temperatures and humidity levels you can expect dangerous heat conditions. Sunstroke, muscle cramps and heat exhaustion are likely. Heatstroke is possible with prolonged exposure and/or physical activity (see heat index for more information).
Precipitation
The average monthly amount of precipitation has been recorded at around 273 mm, that's 11 inches. Throughout the month you can expect to see rain or drizzle falling on 16 days of the month.
Wind
The average daily wind speed in September has been around 2 km/h, that’s the equivalent to about 1 mph, or 1 knots. In recent years the maximum sustained wind speed has reached 28 km/h, that’s the equivalent of around 17 mph, or 15 knots.
Fog
On average the month of September is not affected by foggy conditions.
YEARLY TRENDS: WEATHER AVERAGES & EXTREMES
The following charts show yearly weather trends with information on monthly weather averages and extremes.
Temperature
The chart below plots the average high and low temperature for each month of the year. It also shows the maximum and minimum recorded temperatures.
Precipitation Amount
The chart below plots the average monthly precipitation amount.
Rain days
The chart below plots the average number of days in any month that you can expect to see rain falling.
Wind Speed
The chart below plots the average daily wind speed you can expect for any month. It also shows the maximum recorded sustained wind speed for each month.