Choeng Mon Beach Weather in September

Thinking of visiting Choeng Mon Beach in September? Expect high temperatures reaching 30°C (86°F) during the day, dropping to 27°C (81°F) at night, and note that quite a bit of rainfall is likely.

Rainfall in Choeng Mon Beach in September

This month experiences about 18 days of rain according to historical data, averaging 170 mm (6.7 in). Expect frequent rainfall this month, and not just light drizzle. When it rains, it tends to come down hard.

Temperature in Choeng Mon Beach in September

Daytime highs in Choeng Mon Beach in September reach 30°C (86°F), with nights around 27°C (81°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. Nights are warm at 27°C (81°F), which can make sleeping uncomfortable. Keeping windows open or using a fan can help. A cold shower before bed is also a good way to cool down.

Sunshine in Choeng Mon Beach in September

The area enjoys a balanced 145 hours of sunlight, ensuring it's neither too overcast nor too sunny.

Average water temperature in September

The water is 29°C (84°F) — very warm by most standards. Comfortable to swim in, but not particularly refreshing if you're looking to cool off.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. January and February typically offer the best weather for Choeng Mon Beach.

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Check the conditions for any month of the year.

• January
• February
• March
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• May
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• August

• September
• October
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• December

For a detailed overview over the year and the best time to visit Thailand, check out our Choeng Mon Beach's climate page.

Choeng Mon Beach Temperature in September

Min Temperature 27°C (81°F)  

Max Temperature 30°C (86°F)  

Water Temperature 29°C (84°F) *  

Chance of Rain 58%  

Precipitation 170 mm (6.7 in)  

Rainy days 18 days  

Humidity 79% *  

Sunshine 145 hours *  

Percentage Sunshine *  

* Data from: Koh Samui, Thailand (14 KM, 9 Miles).

Daily Historical Temperatures

48-year average (1976-2025)

Based on our historical records, temperatures in Choeng Mon Beach typically stay consistent throughout September, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 26°C (79°F).

Average temperatures in September

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Daily Historical Precipitation

48-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

‹ January February March April May June July August September October November December ›

Historical weather for Choeng Mon Beach in September

Browse day-by-day weather records for Choeng Mon Beach spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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‹ January February March April May June July August September October November December ›

Choeng Mon Beach historical weather extremes in September

Our historical data for Choeng Mon Beach spans 1986 to 2025, revealing these weather extremes.

• The hottest September day on record in Choeng Mon Beach reached 38°C (100°F) (September 13, 2005).
• Choeng Mon Beach experienced its chilliest September day on September 18, 1995, reaching only 26°C (79°F).
• Nighttime temperatures dropped to 20°C (68°F) on September 25, 2012, marking the coldest September night on record.

What to Wear in Choeng Mon Beach in September

Warm but pleasant conditions in Choeng Mon Beach in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. Expect water temperatures of around 29°C (84°F), which is ideal for taking a refreshing dip. Bring swimwear and consider packing a towel for drying off. Sunglasses could come in handy during the sunnier parts of your trip.

What To Do in Choeng Mon Beach in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

7/10

Cycling

7/10

Walking

7/10

Camping

7/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Thailand, check out our Choeng Mon Beach's climate page.

More climate data for Choeng Mon Beach

Temperature Rainfall Sunshine Humidity Water Temp

See the full Choeng Mon Beach climate overview or explore weather in Thailand.