Rayong climate
Rayong (Thailand) has a tropical monsoon climate (Köppen Am). The average temperature over the year is 28 °C82 °F, and about 2,064 mm81 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Rayong climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2983 | 2577 | 2780 | 351.4 |
| Feb | 2984 | 2679 | 2781 | 251.0 |
| Mar | 2985 | 2781 | 2883 | 652.5 |
| Apr | 3086 | 2883 | 2985 | 913.6 |
| May | 3086 | 2984 | 2985 | 2238.8 |
| Jun | 2985 | 2883 | 2984 | 29011 |
| Jul | 2984 | 2882 | 2883 | 32413 |
| Aug | 2984 | 2781 | 2883 | 29312 |
| Sep | 2983 | 2781 | 2882 | 36014 |
| Oct | 2984 | 2781 | 2882 | 2529.9 |
| Nov | 2984 | 2679 | 2882 | 803.1 |
| Dec | 2983 | 2577 | 2780 | 271.1 |
| Year | 3086 | 2577 | 2882 | 2,06481 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 72% | 44% | 5.0 | 11:27 |
| Feb | 75% | 39% | 5.4 | 11:43 |
| Mar | 77% | 47% | 5.6 | 12:02 |
| Apr | 77% | 62% | 5.8 | 12:24 |
| May | 79% | 85% | 5.1 | 12:42 |
| Jun | 81% | 89% | 4.9 | 12:52 |
| Jul | 82% | 89% | 4.8 | 12:48 |
| Aug | 82% | 91% | 4.9 | 12:32 |
| Sep | 82% | 90% | 4.6 | 12:11 |
| Oct | 81% | 78% | 4.8 | 11:49 |
| Nov | 77% | 59% | 5.0 | 11:31 |
| Dec | 73% | 50% | 4.9 | 11:23 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Rayong is like
The warmest month is May, with an average high of 30 °C86 °F and a low of 29 °C84 °F. The coldest is December, when highs average 29 °C83 °F and lows 25 °C77 °F. Temperatures barely change through the year: the warmest and the coolest month differ by only 2.6 °C4.7 °F.
It is very wet, receiving about 2,064 mm81 in of precipitation per year. The wettest three-month stretch is July–September, which brings 47% of the annual total. The wettest month is September (360 mm14 in), the driest is February (25 mm1.0 in).
Relative humidity ranges from 72% in January to 82% in September. The clearest skies (lowest average cloud amount, 39%) are typical of February. Average wind speed near the ground ranges from 11 km/h (7 mph) in October to 18 km/h (11 mph) in July. Daylight lasts from about 11.4 hours in December to 12.9 hours in June.
Best time to visit Rayong
Based on these averages, the most comfortable months for sightseeing and outdoor activities are December–March: average highs of 29 °C83 °F to 29 °C85 °F with 25 mm1.0 in to 65 mm2.5 in of precipitation per month.
The most challenging month is September, which is very wet (360 mm14 in) and humid (82% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Rayong
- Wetter months (May–October) — highs 2983 to 30 °C86 °F, lows 2781 to 29 °C84 °F, about 290 mm11 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
- Drier months (November–April) — highs 2983 to 30 °C86 °F, lows 2577 to 28 °C83 °F, about 54 mm2.1 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses.
How Rayong compares
Compared with Pattaya, about 49 km to the northwest, Rayong has practically the same average temperature and receives 53% more precipitation (2,064 mm81 in vs 1,347 mm53 in).
Of the 22 places in Thailand covered by World Climates, Rayong is the 4th warmest by annual mean temperature and the 3rd wettest by annual precipitation. See all of them on the Thailand climate page.
Places in other countries with the most similar temperature and rainfall pattern (seasons shifted for the other hemisphere where needed): Phu Quoc (Vietnam, Am), Hà Tiên (Vietnam, Aw) and Labuan Bajo (Indonesia, Am).
Nearby places
- Pattaya 49 km · 28 °C83 °F · 1,347 mm53 in
- Si Racha 65 km · 28 °C83 °F · 1,347 mm53 in
- Chon Buri 81 km · 27 °C81 °F · 1,508 mm59 in
- Samut Prakan 125 km · 28 °C82 °F · 1,302 mm51 in
- Hua Hin 142 km · 28 °C82 °F · 1,431 mm56 in
- Bangkok 145 km · 28 °C82 °F · 1,361 mm54 in
- Si Maha Phot 146 km · 27 °C81 °F · 1,546 mm61 in
- Kabin Buri 150 km · 27 °C81 °F · 1,533 mm60 in
Frequently asked questions
What is the warmest month in Rayong?
May is the warmest month in Rayong, with an average high of 30 °C (86 °F) and an average low of 29 °C (84 °F).
What is the coldest month in Rayong?
December is the coldest month, with an average high of 29 °C (83 °F) and an average low of 25 °C (77 °F).
When does it rain the most in Rayong?
September is the wettest month with about 360 mm (14.2 in) of precipitation; February is the driest with about 25 mm (1.0 in).
What is the best time to visit Rayong?
Judging by long-term averages, the most comfortable months are December–March.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.