Cambodia
Phnom Penh in September
In September, Phnom Penh averages a daytime high of 32 °C and a night-time low of 25 °C, with about 273 mm of rain over the month. Phnom Penh has no month that is both mild and dry by the measure used here.
- Average high
- 32 °C
- Average low
- 25 °C
- Rain in the month
- 273 mm
- Daylight on 15 Sep
- 12 h 10 min
- Comfortable month
- No
- Places to stay
- 176
When to go
How September compares with the rest of the year in Phnom Penh
September is tied for the 6th warmest month in Phnom Penh by average daytime high; across the year the highs run from 31 °C to 35 °C and the lows from 22 °C to 25 °C. By day, September is 1 °C cooler than August, and October is about the same as September.
September brings 273 mm of rain, more than the monthly average of 129 mm (1546 mm a year); it is the wettest month.
On 15 September the sun is up for about 12 h 10 min, against 11 h 30 min at the shortest and 12 h 50 min at the longest point of the year (calculated from the latitude, sunrise to sunset).
| Month | High | Low | Rain | Comfortable |
|---|---|---|---|---|
| January | 32 °C | 22 °C | 8 mm | |
| February | 33 °C | 23 °C | 12 mm | |
| March | 34 °C | 24 °C | 44 mm | |
| April | 35 °C | 24 °C | 82 mm | |
| May | 34 °C | 25 °C | 144 mm | |
| June | 33 °C | 25 °C | 194 mm | |
| July | 32 °C | 25 °C | 186 mm | |
| August | 32 °C | 25 °C | 220 mm | |
| September | 32 °C | 25 °C | 273 mm | |
| October | 31 °C | 24 °C | 263 mm | |
| November | 31 °C | 24 °C | 98 mm | |
| December | 31 °C | 23 °C | 23 mm |
Comfortable means average daytime high between 18 °C and 29 °C and under 80 mm of rain in the month. Averages for 1991–2020 over the surrounding area, a grid square about 50 km across, so a coast or a nearby mountain can make the town itself warmer or cooler. Data: CRU TS v4.10, Climatic Research Unit, University of East Anglia (Open Database License).
When to go
Is September a good time to visit Phnom Penh?
Not by the measure used here: the average high of 32 °C is above 29 °C and about 273 mm of rain is 80 mm or more. No month in Phnom Penh meets it.
The measure is about weather for a city stay only; it says nothing about events, school holidays or prices.
Public holidays in Cambodia in September
Nationwide public holidays; shops and offices may close on these dates.
Where to stay
Where to stay in Phnom Penh
This guide lists 176 places to stay in Phnom Penh, hotels recorded in Wikidata. By straight-line distance from the centre: under 1 km, 58; 1–3 km, 90; 3–10 km, 24; 10 km or more, 4.
Sources: climate from CRU TS v4.10 (Climatic Research Unit, University of East Anglia; Open Database License), 1991–2020 averages; day length calculated from the latitude; public holidays from python-holidays (MIT); places to stay from each operator's own public pages and Wikidata. How this guide is made.