Cha-am climate — normals and trends
Cha-am (Thailand) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 27.5 °C and it receives 1,030 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is April (29.1 °C on average) and the coldest is January (25.7 °C). Rainfall peaks in October.
Cha-am averages 0 frost days, 179 hot days (≥ 30 °C) and 150 rainy days per year.
Cha-am has warmed by +1.8 °C between 1940 and 2025, or +0.22 °C per decade. This trend is statistically significant.
The hottest day of the period reached 35.5 °C (on 20 April 2009) and the coldest 16.6 °C (on 25 December 1999).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
Cha-amPhetchaburi
- coords
- 12.80°, 99.97°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
27.5°C
Average daily high
29.9°C
Average daily low
25.5°C
Annual rainfall
1,030mm
Sunshine / day
10.0h
Mean relative humidity
75%
Average peak wind
17.8km/h
Seasonal range
3.4°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
179 d/yr
Rainy days (≥ 1 mm)
150 d/yr
Annual snowfall
0.0 cm
Average feels-like high
34.4 °C
Average feels-like low
29.0 °C
Average peak gust
31.3 km/h
Tropical nights (≥ 20 °C)
363 d/yr
Solar radiation
19.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.76 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
35.5 °C
20 April 2009
Coldest day
16.6 °C
25 December 1999
Wettest day
195 mm
4 November 1949
Windiest day
50.9 km/h
4 November 1997
Strongest gust
90.7 km/h
4 November 1997
Hottest feels-like
43.1 °C
2 May 2019
Coldest feels-like
12.4 °C
25 December 1999
Sunniest day
12.8 h
26 June 1947
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 27.8 °C | -0.4 °C | 2 mm | -15 mm |
| Feb | 29.6 °C | +0.2 °C | 44 mm | +20 mm |
| Mar | 31.2 °C | +0.6 °C | 27 mm | -12 mm |
| Apr | 31.8 °C | +0.2 °C | 56 mm | +1 mm |
| May | 31.3 °C | -0.1 °C | 147 mm | +47 mm |
| Jun | 31.9 °C | +0.7 °C | 57 mm | -17 mm |
| Jul | 31.6 °C | +1.0 °C | 86 mm | -2 mm |
| Aug | 31.5 °C | +1.1 °C | 85 mm | -5 mm |
| Sep | 30.3 °C | +0.5 °C | 142 mm | +5 mm |
| Oct | 29.9 °C | +1.0 °C | 191 mm | -72 mm |
| Nov | 28.4 °C | -0.1 °C | 88 mm | -34 mm |
| Dec | 29.1 °C | +1.2 °C | 4 mm | -16 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Cha-am?
Cha-am has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 27.5 °C and it receives 1,030 mm of precipitation per year.
What is the hottest day ever recorded in Cha-am?
The hottest day measured in Cha-am between 1940 and 2025 was 20 April 2009, reaching 35.5 °C.
What is the coldest day in Cha-am?
The coldest day measured in Cha-am between 1940 and 2025 was 25 December 1999, at 16.6 °C.
Does it snow in Cha-am?
Almost never: Cha-am sees virtually no snow, with about 0 frost days per year.
Has the climate of Cha-am warmed?
Yes: Cha-am warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Cha-am?
The wettest day measured in Cha-am between 1940 and 2025 was 4 November 1949, with 195 mm of rain in 24 hours.
What was the windiest day in Cha-am?
The windiest day measured in Cha-am between 1940 and 2025 was 4 November 1997, with winds reaching 50.9 km/h.
What is the warmest month in Cha-am?
The warmest month in Cha-am is April (29.1 °C on average); the coldest is January (25.7 °C).
How much does it rain in Cha-am?
Cha-am receives on average 1,030 mm of precipitation per year, spread over about 150 rainy days.
Is it sunny in Cha-am?
Cha-am gets on average 10.0 hours of sunshine per day, roughly 3,650 hours per year over 1940-2025.
Are there tropical nights in Cha-am?
Yes: Cha-am has on average 363 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Cha-am?
In Cha-am, between 1940 and 2025, the highest apparent temperature reached 43.1 °C on 2 May 2019, and the lowest was 12.4 °C on 25 December 1999.
Compare Cha-am with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Cha-am