San Sai Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit San Sai.
Climate overview of San Sai
Temperatures in San Sai, Chiang Mai Province, Thailand, shift moderately through the seasons. The warmest month is April at 38°C (100°F), and the coolest is December at 30°C (86°F).
The city receives considerable rainfall, with around 1330 mm (52 in) annually. August is the wettest month. It has distinct dry (November to April) and wet (June to September) seasons. March is the sunniest month, averaging 9.8 hours of sunshine per day.
San Sai Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in San Sai - and find the best time to visit.
Monthly Temperature in San Sai
The climate in San Sai experiences moderate temperature changes, with mild shifts between seasons. Typically, average maximum daytime temperatures range from a very hot 38°C (100°F) in April to a comfortable 30°C (86°F) in the coolest month, December.
Nights vary from 25°C (77°F) in April to around 15°C (59°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in San Sai
San Sai has a notably wet climate with abundant precipitation, recording 1330 mm (52 in) of rainfall per year. The climate in San Sai shows significant variation throughout the year. Expect heavy rainfall in August, the wettest month, with an average of 283 mm (11 in) of precipitation over 20 rainy days.
In contrast, the driest month February offers drier and sunnier days, with around 5.6 mm (0.2 in) of rainfall over a single rainy day. For more details, please visit our San Sai Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in San Sai
For those who appreciate different seasons, San Sai serves as an ideal destination. Expect longer, more sun-filled days in March with an average of 9.8 hours of sunshine daily, and embrace the darker days in August, offering only 3.9 hours of daily sunlight.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Humidity in San Sai by Month
The relative humidity is high throughout the year in San Sai.
The city experiences its highest humidity in August, reaching 81%. In March, the humidity drops to its lowest level at 52%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Wind Speed in San Sai
The mean wind speed over the year ranges from () in January, November and December to 1 m/s (2 knots) in February, March, April, May, June, July, August, September and October. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit San Sai
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: January, November and December
- Warmest weather: March and April
- Most sunshine: March
- Fewest rainy days: January, February, March and December
- Wettest months: May, June, July, August, September and October, when rainfall is highest.
- Seasonal pattern: Distinct dry (November to April) and wet (June to September) seasons
Frequently asked questions about the climate in San Sai
What is the best time to visit San Sai?
January, November and December typically offer the most optimal weather in San Sai. In contrast, February, March, April, May, June, July, August and September tend to have less optimal conditions. San Sai has distinct dry (November to April) and wet (June to September) seasons.
What temperatures can I expect in San Sai?
Daytime highs range from 30°C (86°F) in December to 38°C (100°F) in April. Nighttime lows range from 15°C (59°F) to 25°C (77°F).
How much rain does San Sai get?
Annual rainfall is around 1330 mm (52 in). August is the wettest month with 283 mm (11 in), while February is the driest with 5.6 mm (0.2 in).
How sunny is San Sai?
San Sai receives around 2,525 hours of sunshine per year. March is the sunniest month with 295 hours, while August is the cloudiest with just 116 hours. Overall, San Sai enjoys abundant sunshine.
San Sai 3-Day Forecast
San Sai on the map
San Sai is highlighted - select any city to see its climate.
Popular this month
Where to go in August - average daytime high across popular destinations.
Bangkok
34°C (93°F) Jomtien Beach
32°C (90°F) Hua Hin32°C (90°F) Chiang Mai32°C (90°F) Koh Samui30°C (86°F) Ao Nang Beach30°C (86°F) Ko Lanta30°C (86°F) Patong Beach30°C (86°F) 
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Discover Kok Kood: a hidden gem in Thailand
Discover the hidden gem of Thailand - Koh Kood! Explore stunning beaches, waterfalls and eco-friendly resorts while enjoying a peaceful atmosphere away from the crowds.
Discover Thailand: An Ultimate Guide for Yogis
Explore Thailand's best for yogis: serene retreats, spiritual growth, and adventure. Dive into yoga, meditation, and nature's tranquility for an unforgettable journey.
Trekking in Northern Thailand
One of the most beautiful attractions in Thailand is trekking along mountain villages north of Chiang Mai. The best time to trek is November until February.
Elephant Haven in Thailand: Kindred Spirit Sanctuary
Explore the Kindred Spirit Elephant Sanctuary in Thailand. Experience hiking, observe elephants in nature, and see the positive impact on the community.