Weather in Phnom Penh 🇰🇭
Monthly weather averages & travel planning
January
Avg Temp
32°C
Rain Days
3 days
Sun Hours
11 hrs
Humidity
82%
Asia › 🇰🇭 Cambodia › Phnom Penh
Updated: March 2026
Is January a Good Time to Visit Phnom Penh?
7/10
Good
January is a good time to visit Phnom Penh (7/10). With 11 daily sunshine hours and only 3 rain days, this month delivers genuinely reliable outdoor conditions, ranking it the sunniest month of the year in Phnom Penh. Culture-focused travellers and those who prefer lighter crowds will find January a practical choice, with prices running lower than peak January without sacrificing all the good weather. December offers a similar profile at lower hotel rates if dates are flexible. The main practical note: Phnom Penh's popular sites are busiest between 10am and 3pm regardless of season. Arriving at opening time or after 4pm makes a significant difference to the experience. Planning tips: accommodation is generally available without long lead times, and flight prices are typically lower than peak season. Flexible travellers will find the best deals by booking 2-4 weeks ahead. Mid-week arrivals consistently unlock lower hotel rates than weekend check-ins.
vs December:31°C avg high
Step off the plane in Phnom Penh in January and the air meets you at around 32°C, carrying the kind of warmth that makes you reach for sunglasses before your bag is off the belt. By the time evening arrives and temperatures settle near 22°C, the city takes on a different character entirely. With 11 hours of daylight sun on offer, January gives you the raw material for a genuinely memorable trip.
32°C
90°F
Avg High
22°C
72°F
Avg Low
3 days
15 mm total
Rain Days
11h
per day avg
Sunshine
82%
Humid
Humidity
Temperature in Phnom Penh in January
The 10°C day-night temperature range is typical for continental climates: a light jacket in the morning that you shed by midday and need again after sunset. At 82% humidity, the 32°C daytime high feels 2-4°C warmer in practice: quick-dry fabrics and shade-seeking between noon and 3pm are the sensible response. The UV index of 3 is low, meaning sun exposure is minimal concern and sunscreen is largely optional. Winds are calm at an average 13 km/h, so wind-chill is not a factor in planning your clothing. In Fahrenheit: 90°F average high, 72°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).
Temperature Trends
High
Low
Rainfall (mm)
0-20 mm21-50 mm51-100 mm100+ mm
What to Wear in Phnom Penh in January
Morning22°CBefore the day warms up
Afternoon32°CPeak daytime temperature
Evening25°CAfter sunset cools down
Packing for Phnom Penh in January means dressing for 32°C days and 22°C evenings. A lightweight linen or cotton shirt with loose-fit trousers or a sundress handles the 32°C daytime heat. Evening temperatures settle at 22°C, a modest 10°C drop that a light cardigan or denim jacket covers. For footwear, breathable walking sandals work for casual exploration, but closed-toe trainers are better for uneven surfaces in the historic centre. For temple and religious site visits, carry a lightweight scarf or sarong to cover shoulders and knees, required at most major sites across the region. At 82% average humidity, quick-dry synthetic or bamboo fabrics dry overnight and stay comfortable longer than cotton.
Local tip: Loose-weave linen and moisture-wicking fabrics are the practical choice in Phnom Penh's heat and humidity. Many shopping centres run air conditioning at near-arctic levels, so a thin layer in your bag prevents discomfort indoors.
Events in Phnom Penh in January
January has no major festivals or public holidays in Phnom Penh, which is one of its practical advantages for independent travellers. Attractions run at lower capacity than during peak event periods, queues are shorter, and accommodation is easier to find without needing to book many months in advance. Local restaurants, markets, and transport operate at a relaxed pace, making this an ideal time for visitors who prefer a more authentic, unhurried experience of everyday city life rather than large crowds drawn in by a single major headline event.
What to Pack for Phnom Penh in January
Based on 32°C average highs and 3 rainy days
- Lightweight breathable clothing
- Linen or bamboo shirts for the hottest hours
- Sun hat with a wide brim
- UV-protective sunglasses
- Hydration bottle (at least 1 litre)
- Quick-dry travel towel
- Anti-chafe balm for long walking days
- Moisture-wicking synthetic fabrics for active days
- SPF 30+ sunscreen
- Comfortable walking shoes (a second pair lets the first air out overnight)
- Universal travel adapter
- Small day pack for city exploration
- Reusable water bottle
Best Activities in Phnom Penh in January
- Early morning walk through Phnom Penh's historic market districtBest before 9amTemperatures are still manageable at 28°C before the midday heat builds
- Open-air rooftop dining at sunsetFrom 6pm onwardsThe 32°C daytime heat drops noticeably after sunset, making al fresco dining comfortable
- Waterfront promenade or harbour walkEarly morning or after 5pmSea breezes cut through the humidity, making coastal routes the most pleasant in heat
- Guided cycling tour of the old quarterFirst tour of the day (7-9am)The low-traffic window before tourist crowds and the cooler morning air make this the prime riding slot
- Afternoon in a world-class museum or galleryAfternoon (2-5pm)Pairs well with outdoor morning activities and provides a mid-day rest from sightseeing
- Coffee-house or traditional cafe culture experienceMid-morning or post-lunchA cultural ritual in this region that rewards slow appreciation regardless of weather
- Evening live music, theatre, or opera performanceEvening shows typically at 7-9pmConsistent evening temperatures make getting to and from evening venues comfortable
- Visit the main botanical garden or city park at seasonal peakYear-round; best light in morningJanuary brings distinct seasonal changes to public green spaces worth exploring
- Seek out chilled local specialities: cold-brew tea, ice desserts, or chilled seafood at street-level stallsAny time; most atmospheric in evening marketsHot-weather street food culture peaks in January, with vendors setting up specifically for warm evenings
Why is Phnom Penh warm in January?
In January, Phnom Penh sits in the dry season corridor, as the ITCZ shifts away from the region and trade winds bring drier, more stable air. This produces reliably sunny days reaching 32°C, with lower humidity than the wet months. Overnight lows of 22°C offer a pleasant reprieve from the midday heat. Climate data: Open-Meteo ERA5 (1991–2020).
Sunshine Hours
The average number of hours per day with direct sunlight. Calculated from satellite measurements. Days with more than 7 hours of sunshine are ideal for outdoor activities. Under 3 hours means overcast conditions dominate.
UV Index
A scale from 0-11+ measuring ultraviolet radiation intensity. UV 0-2: Minimal risk. UV 3-5: Moderate, wear sunscreen. UV 6-7: High, hat and SPF 30+ essential. UV 8-10: Very High, limit midday exposure. UV 11+: Extreme, seek shade between 10am-4pm.
Rain Days
A rain day is counted when precipitation exceeds 0.1mm. This threshold captures even light drizzle. Unlike total rainfall in mm, rain days tells you how often you might need an umbrella, which is useful for planning outdoor activities.
Humidity
Relative humidity as a percentage. Below 40%: Dry, skin and throat may feel parched. 40-60%: Comfortable, ideal for most people. 60-80%: Sticky, light breathable fabrics recommended. Above 80%: Muggy, heat feels more intense; quick-dry clothing is essential.
Frequently Asked Questions
Phnom Penh in January
In January, Phnom Penh experiences average highs of 32°C (90°F) and lows of 22°C (72°F). Expect around 3 rainy days and 11 hours of sunshine per day, with humidity averaging 82%. The 10°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an overshirt or cardigan handles the cooler evenings. UV exposure is moderate at index 3.
Phnom Penh typically sees 3 rainy days in January, with total precipitation of around 15mm. This makes January one of the drier months of the year, and a reliable window for outdoor sightseeing and day trips. Rain showers tend to be brief when they do occur. For context, the driest month in Phnom Penh typically sees 4-6 fewer rain days than January.
Pack lightweight, breathable clothing (linen or cotton), a wide-brim sun hat, SPF 50+ sunscreen, and a refillable water bottle for Phnom Penh in January. The 32°C daytime heat demands sun protection during midday hours, typically 11am to 4pm. Rain is unlikely with only 3 wet days, so leave the umbrella at home and use the bag space for sunscreen. Quick-dry synthetic fabrics are preferable to cotton in 82% humidity.
Yes, January is an excellent time to visit Phnom Penh. With 11 daily sunshine hours and only 3 rainy days, conditions are ideal for sightseeing and outdoor activities. Temperatures averaging 32°C during the day are comfortable for long walks and outdoor dining. This is peak travel season, so booking accommodation in advance and arriving at popular attractions early in the morning helps avoid the busiest periods.
The average high temperature in Phnom Penh in January is 32°C (90°F), and the average low is 22°C (72°F). The mean daily temperature is approximately 27°C (81°F). The day-to-night range of 10°C is moderate, meaning a single light jacket covers most situations. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.
The best month to visit Phnom Penh is generally January. January offers the most sunshine at 11 hours per day and only 3 rainy days. Average temperatures reach 32°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around January gives you the best chance of dry, bright weather.
January is shoulder or low season in Phnom Penh, meaning fewer tourists and generally lower prices than peak months. With 11 sunshine hours and 3 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.
In January, Phnom Penh suits a range of activities thanks to warm temperatures of 32°C. With few rainy days, outdoor activities are highly recommended. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 11 hours of sunshine, parks and waterfront walks are particularly enjoyable.
January ranks 1st sunniest of the year in Phnom Penh, with an average 11 daily sunshine hours. The driest months are February, January, and December. March is the hottest month (35°C avg high); October is the coolest (30°C). From here, temperatures rise 1°C into February. Compared to last month (December: 31°C high, 5 rain days), January is warmer and drier. January is among the top three sunniest months to visit Phnom Penh.
Year-Round Climate
| Month | High | Low | Rain Days | Sun | Details |
|---|---|---|---|---|---|
| January | 32°C | 22°C | 3 | 11h | View |
| February | 33°C | 23°C | 2 | 11h | View |
| March | 35°C | 25°C | 6 | 11h | View |
| April | 35°C | 26°C | 14 | 11h | View |
| May | 34°C | 26°C | 23 | 11h | View |
| June | 32°C | 25°C | 24 | 10h | View |
| July | 32°C | 25°C | 25 | 9h | View |
| August | 32°C | 25°C | 25 | 9h | View |
| September | 31°C | 24°C | 27 | 9h | View |
| October | 30°C | 24°C | 25 | 9h | View |
| November | 30°C | 23°C | 11 | 10h | View |
| December | 31°C | 23°C | 5 | 10h | View |
January
3 rain days, 11h sun
32°22°
February
2 rain days, 11h sun
33°23°
March
6 rain days, 11h sun
35°25°
April
14 rain days, 11h sun
35°26°
May
23 rain days, 11h sun
34°26°
June
24 rain days, 10h sun
32°25°
July
25 rain days, 9h sun
32°25°
August
25 rain days, 9h sun
32°25°
September
27 rain days, 9h sun
31°24°
October
25 rain days, 9h sun
30°24°
November
11 rain days, 10h sun
30°23°
December
5 rain days, 10h sun
31°23°
Other Months in Phnom Penh
Plan Your Trip to Phnom Penh
Nearby Destinations
Cities within 500 km with comparable weather conditions
Data Sources for Phnom Penh
Climate normals represent 30-year averages (1991-2020). Individual years may vary.