Ratchaburi, Thailand experiences average highs of 32°C (90°F) and lows of 24°C (75°F) throughout the year. Rainfall is frequent, averaging about 13 rainy days per month. Sunshine is abundant, averaging about 9 hours per day. Average highs have cooled by 0.9°C (1.6°F) across the available records.
Ratchaburi, Thailand Weather & Climate 2026
Monthly climate averages for Ratchaburi, Thailand. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: May–Oct At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
3.8/10
Best: January, December
UV Index
7
High
Temperature 32°C / 24°C
Feels Like 37°C / 28°C
Rainy Days 13
Rainfall 96 mm
Sunshine 9 h
Humidity 73%
Wind Speed 12 km/h
Dew Point 23°C
Hottest Month
36°C
April
Avg Low 26°C
Rain 8 days
Coldest Month
21°C
January
Avg High 31°C
Rain 2 days
Driest Month
2 days
January
Avg High 31°C
Avg Low 21°C
Windiest Month
13 km/h
July (Gusts 35)
Worst Time to Visit
Consider avoiding May, August, September, October due to extreme heat, heavy rainfall, oppressive humidity.
Sun Position
Sunrise 06:01
Daylight 12.9h
Sunset 18:52
Live conditions —
Ratchaburi on the map · live conditions
Ratchaburi, Thailand
- Continent
- Asia
- Country
- Thailand
- City
- Ratchaburi
- Population
- 92.4K
- Coordinates
- 13.54°, 99.82°
Seasonal Breakdown
Spring
Mar–May
Avg High 35°C
Avg Low 26°C
Rain 10 days/mo
Summer
Jun–Aug
Avg High 32°C
Avg Low 26°C
Rain 22 days/mo
Autumn
Sep–Nov
Avg High 30°C
Avg Low 24°C
Rain 18 days/mo
Winter
Dec–Feb
Avg High 31°C
Avg Low 22°C
Rain 3 days/mo
2/3 best months
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
High Low Shaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 31°C / 21°C . Feb: 32°C / 22°C . Mar: 35°C / 24°C . Apr: 36°C / 26°C . May: 34°C / 27°C . Jun: 33°C / 26°C . Jul: 32°C / 26°C . Aug: 32°C / 25°C . Sep: 31°C / 25°C . Oct: 30°C / 24°C . Nov: 30°C / 23°C . Dec: 30°C / 22°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 15 mm. Feb: 22 mm. Mar: 35 mm. Apr: 64 mm. May: 130 mm. Jun: 110 mm. Jul: 132 mm. Aug: 141 mm. Sep: 202 mm. Oct: 207 mm. Nov: 79 mm. Dec: 14 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 67%. Feb: 67%. Mar: 67%. Apr: 67%. May: 72%. Jun: 75%. Jul: 77%. Aug: 77%. Sep: 81%. Oct: 84%. Nov: 77%. Dec: 67%.
Monthly Wind Speed
Wind Speed Gusts
Bar chart showing monthly wind speed. Jan: 11 km/h . Feb: 12 km/h . Mar: 13 km/h . Apr: 13 km/h . May: 12 km/h . Jun: 13 km/h . Jul: 13 km/h . Aug: 13 km/h . Sep: 11 km/h . Oct: 10 km/h . Nov: 11 km/h . Dec: 12 km/h .
Sunshine
Sunshine
Sunshine: Jan: 10h. Feb: 11h. Mar: 11h. Apr: 11h. May: 10h. Jun: 9h. Jul: 8h. Aug: 8h. Sep: 8h. Oct: 8h. Nov: 9h. Dec: 10h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 7. Feb: UV 8. Mar: UV 9. Apr: UV 9. May: UV 8. Jun: UV 6. Jul: UV 6. Aug: UV 8. Sep: UV 7. Oct: UV 7. Nov: UV 7. Dec: UV 7.
Monthly Daylight Hours
Daylight 12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy
Climate Trends
Average highs have cooled by 0.9°C (1.6°F) across the available records. Average rainfall is trending wetter by about 20 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Apr 2025 · 35°C | Apr · 36°C |
| Coldest month | Jan 2025 · 19°C | Jan · 21°C |
| Wettest month | Sep 2025 · 281 mm | Oct · 207 mm |
| Windiest month | Jul 2025 · 14 km/h | Jul · 13 km/h |
Month-by-Month Weather Table
January best
Excellent 
February
Fair March
Poor April
Poor May
Wet June
Wet July
Wet August
Wet September
Wet October
Wet November
Fair December best
Excellent | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January best | 31°C / 21°C | 33°C / 23°C | 2days (15 mm) Excellent | 9.9h Good | 67% Muggy | 7.2 Very High | Excellent | View Details |
| February | 32°C / 22°C | 36°C / 25°C | 4days (22 mm) Good | 10.6h Excellent | 67% Muggy | 8 Very High | Fair | View Details |
| March | 35°C / 24°C | 39°C / 29°C | 4days (35 mm) Good | 10.6h Excellent | 67% Muggy | 8.8 Very High | Poor | View Details |
| April | 36°C / 26°C | 41°C / 31°C | 8days (64 mm) Wet | 10.6h Excellent | 67% Muggy | 8.9 Very High | Poor | View Details |
| May | 34°C / 27°C | 40°C / 32°C | 19days (130 mm) Wet | 9.9h Good | 72% Muggy | 7.9 Very High | Wet | View Details |
| June | 33°C / 26°C | 38°C / 31°C | 20days (110 mm) Wet | 9.1h Good | 75% Muggy | 6.4 High | Wet | View Details |
| July | 32°C / 26°C | 37°C / 31°C | 23days (132 mm) Wet | 7.9h Good | 77% Humid | 5.9 High | Wet | View Details |
| August | 32°C / 25°C | 37°C / 30°C | 22days (141 mm) Wet | 8.1h Good | 77% Humid | 7.7 Very High | Wet | View Details |
| September | 31°C / 25°C | 37°C / 30°C | 23days (202 mm) Wet | 7.8h Good | 81% Humid | 6.8 High | Wet | View Details |
| October | 30°C / 24°C | 36°C / 29°C | 21days (207 mm) Wet | 8.4h Good | 84% Humid | 7.4 Very High | Wet | View Details |
| November | 30°C / 23°C | 34°C / 26°C | 10days (79 mm) Wet | 9h Good | 77% Humid | 6.7 High | Fair | View Details |
| December best | 30°C / 22°C | 32°C / 23°C | 3days (14 mm) Excellent | 9.7h Good | 67% Muggy | 6.8 High | Excellent | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Ratchaburi are January, December, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Ratchaburi, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Ratchaburi is April, with average daytime highs of 36°C (96°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Ratchaburi is January, with average overnight lows of 21°C (70°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Ratchaburi is October, averaging 207mm of precipitation across 21 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Ratchaburi runs through July, September, August, October, with the heaviest rainfall in July. Based on 10-year averages for Ratchaburi.
Ratchaburi receives approximately 112 sunshine hours per year. The sunniest month is February with around 11 hours. Based on climate data for Ratchaburi.
The least favorable months to visit Ratchaburi are May, August, September, October, primarily due to extreme heat, heavy rainfall, oppressive humidity. For the best conditions, consider January, December instead.
The annual average UV index in Ratchaburi is 7, classified as high. SPF 30+ sunscreen, sunglasses, and seeking shade between 10:00–16:00 are strongly recommended.
Average humidity in Ratchaburi is 73%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Average wind speeds in Ratchaburi are 12 km/h (7 mph). The windiest month is July with peak winds reaching 13 km/h (8 mph) (gusts up to 35 km/h / 22 mph).
Ratchaburi averages 3 clear-sky days per month with overall cloud cover around 68%. The clearest skies occur in February.
The annual average dew point in Ratchaburi is 23°C (73°F), which feels muggy and uncomfortable. Expect heavy perspiration during warmer months — stay hydrated and take breaks in air-conditioned spaces.
Ratchaburi has a Tropical Monsoon climate, classified as Am under the Köppen system. Tropical climates are warm year-round with high rainfall and temperatures rarely dropping below 18°C (64°F).
The 'feels like' temperature in Ratchaburi ranges from 28°C (82°F) to 37°C (99°F) on average. Humidity and radiant heat mean it often feels warmer than the thermometer reads, especially in summer months.
July is not the best time to visit Ratchaburi, with a climate score of 2.1/10. Consider visiting during January, December instead for better conditions.
For July in Ratchaburi, pack Umbrella, Waterproof jacket, Waterproof shoes, Breathable clothing, Sunscreen (SPF 30+). With average highs of 32°C (90°F) and 23 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
Last updated: