Climate averages 1991–2020
Si Racha weather
in May.
A hot, wet month: the 3rd warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a hot month in Si Racha: daytime highs average 32.1°C and nights cool to about 26.6°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 145 mm of rain on roughly 21 days, which makes May a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 44 min on an average May day.
The nearest other city in this atlas is Laem Chabang (11 km away). In May its highs average 31.3°C, 0.8°C cooler than Si Racha, with 152 mm of rain.
Among the 46 cities listed in Thailand, Si Racha ranks joint 36th of 46 for the warmest May highs and joint 21st of 46 for the driest May (rainfall, lowest first). The mean May high of those 46 cities is 32.7°C; Si Racha is 0.6°C cooler than that mean.
From May to June, average highs fall by 0.9°C to 31.2°C, and monthly rainfall falls from 145 mm to 123 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Si Racha climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 31.0°C22.5°C | 22.5°C | 22 | 4.7 | 11.411 h |
| February | 31.8°C23.8°C | 23.8°C | 23 | 5.1 | 11.712 h |
| March | 32.6°C25.4°C | 25.4°C | 58 | 10.6 | 12.112 h |
| April | 33.1°C26.4°C | 26.4°C | 90 | 14.1 | 12.412 h |
| May, selected | 32.1°C26.6°C | 26.6°C | 145 | 21.2 | 12.713 h |
| June | 31.2°C26.5°C | 26.5°C | 123 | 20.9 | 12.913 h |
| July | 30.6°C26.2°C | 26.2°C | 133 | 22.5 | 12.813 h |
| August | 30.4°C26.0°C | 26.0°C | 136 | 23.3 | 12.613 h |
| September | 30.1°C25.4°C | 25.4°C | 232 | 25.1 | 12.212 h |
| October | 30.1°C24.5°C | 24.5°C | 195 | 21.7 | 11.812 h |
| November | 30.6°C23.7°C | 23.7°C | 43 | 7.1 | 11.512 h |
| December | 30.5°C22.4°C | 22.4°C | 12 | 2.6 | 11.411 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Laem Chabang in MayThailand · 11 kmHigh 31.3°C · Low 26.8°C · 152 mm rain
- Chon Buri in MayThailand · 22 kmHigh 32.5°C · Low 26.2°C · 145 mm rain
- Pattaya in MayThailand · 27 kmHigh 31.5°C · Low 26.8°C · 152 mm rain
- Samut Prakan in MayThailand · 59 kmHigh 32.6°C · Low 27.0°C · 124 mm rain
- Lat Krabang in MayThailand · 63 kmHigh 33.1°C · Low 26.4°C · 150 mm rain
- Rayong in MayThailand · 65 kmHigh 30.7°C · Low 26.2°C · 220 mm rain
- Ban Khlong Prawet in MayThailand · 66 kmHigh 33.1°C · Low 26.7°C · 150 mm rain
- Thung Khru in MayThailand · 68 kmHigh 32.7°C · Low 27.0°C · 130 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Si Racha) is explained once on the Si Racha year overview and on the Sources, method and limits page.
Chon Buri lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.