San Isidro de El General climate — normals and trends
San Isidro de El General (Costa Rica) has a tropical rainforest climate (Af) under the Köppen-Geiger classification. Its mean annual temperature is 21.9 °C and it receives 7,238 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 (22.5 °C on average) and the coldest is December (21.4 °C). Rainfall peaks in October.
San Isidro de El General averages 0 frost days, 0 hot days (≥ 30 °C) and 352 rainy days per year.
San Isidro de El General has warmed by +1.0 °C between 1940 and 2025, or +0.12 °C per decade. This trend is statistically significant.
The hottest day of the period reached 27.3 °C (on 23 June 1983) and the coldest 16.2 °C (on 12 January 1940).
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
San Isidro de El GeneralSan José
- coords
- 9.37°, -83.70°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
21.9°C
Average daily high
23.8°C
Average daily low
20.2°C
Annual rainfall
7,238mm
Sunshine / day
8.8h
Mean relative humidity
87%
Average peak wind
9.5km/h
Seasonal range
1.1°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
352 d/yr
Annual snowfall
0.0 cm
Average feels-like high
27.7 °C
Average feels-like low
22.7 °C
Average peak gust
22.6 km/h
Tropical nights (≥ 20 °C)
238 d/yr
Solar radiation
16.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.0 °C
since 1940
+0.1 °C per decade · r² = 0.51 · 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
27.3 °C
23 June 1983
Coldest day
16.2 °C
12 January 1940
Wettest day
261 mm
13 June 1995
Windiest day
27.3 km/h
14 November 1979
Strongest gust
54.0 km/h
14 November 1979
Hottest feels-like
33.0 °C
24 May 2020
Coldest feels-like
15.9 °C
12 January 1940
Sunniest day
12.5 h
2 June 2021
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 | 23.9 °C | +0.3 °C | 159 mm | -78 mm |
| Feb | 24.0 °C | 0.0 °C | 302 mm | +139 mm |
| Mar | 24.7 °C | +0.3 °C | 182 mm | +14 mm |
| Apr | 24.7 °C | +0.3 °C | 468 mm | +132 mm |
| May | 24.9 °C | +0.7 °C | 583 mm | -137 mm |
| Jun | 24.4 °C | +0.4 °C | 650 mm | -114 mm |
| Jul | 24.5 °C | +0.8 °C | 601 mm | -269 mm |
| Aug | 24.3 °C | +0.6 °C | 823 mm | -61 mm |
| Sep | 24.3 °C | +0.6 °C | 781 mm | -9 mm |
| Oct | 23.8 °C | +0.4 °C | 1325 mm | +337 mm |
| Nov | 23.9 °C | +0.7 °C | 850 mm | +3 mm |
| Dec | 23.8 °C | +0.4 °C | 483 mm | +14 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 San Isidro de El General?
San Isidro de El General has a tropical rainforest climate (Köppen Af). Over 1940-2025, the average annual temperature is 21.9 °C and it receives 7,238 mm of precipitation per year.
What is the hottest day ever recorded in San Isidro de El General?
The hottest day measured in San Isidro de El General between 1940 and 2025 was 23 June 1983, reaching 27.3 °C.
What is the coldest day in San Isidro de El General?
The coldest day measured in San Isidro de El General between 1940 and 2025 was 12 January 1940, at 16.2 °C.
Does it snow in San Isidro de El General?
Almost never: San Isidro de El General sees virtually no snow, with about 0 frost days per year.
Has the climate of San Isidro de El General warmed?
Yes: San Isidro de El General warmed by +1.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in San Isidro de El General?
The wettest day measured in San Isidro de El General between 1940 and 2025 was 13 June 1995, with 261 mm of rain in 24 hours.
What was the windiest day in San Isidro de El General?
The windiest day measured in San Isidro de El General between 1940 and 2025 was 14 November 1979, with winds reaching 27.3 km/h.
What is the warmest month in San Isidro de El General?
The warmest month in San Isidro de El General is April (22.5 °C on average); the coldest is December (21.4 °C).
How much does it rain in San Isidro de El General?
San Isidro de El General receives on average 7,238 mm of precipitation per year, spread over about 352 rainy days.
Is it sunny in San Isidro de El General?
San Isidro de El General gets on average 8.8 hours of sunshine per day, roughly 3,212 hours per year over 1940-2025.
Are there tropical nights in San Isidro de El General?
Yes: San Isidro de El General has on average 238 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in San Isidro de El General?
In San Isidro de El General, between 1940 and 2025, the highest apparent temperature reached 33.0 °C on 24 May 2020, and the lowest was 15.9 °C on 12 January 1940.
Compare San Isidro de El General with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around San Isidro de El General