San José weather in April
In April, San José has daytime highs averaging 27 °C, nights around 18 °C, with 17 wet days. Figures are 1991–2020 climate normals.
- 26.5°C Average high
- 17.8°C Average low
- 17days Wet days
- 99mm Rainfall
- 12h Daylight
Daily temperatures through April
How April develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 April | 27.0 °C | 17.6 °C | 43 % |
| 11–20 April | 26.6 °C | 17.8 °C | 54 % |
| 21–30 April | 26.1 °C | 18.0 °C | 67 % |
- Rain is most likely over days 21–30 of April (67 % of days) and least likely over days 1–10 (43 %).
What to expect
| Measure | Typical April | Share of the month |
|---|---|---|
| Days above 25 °C | 26 of 30 | 85 % |
| Days above 30 °C | 0.1 of 30 | 0 % |
| Days below 0 °C | 0 of 30 | 0 % |
| Days with more than 1 mm rain | 17 of 30 | 55 % |
Conditions in April
| Measure | Average |
|---|---|
| Mean temperature | 21 °C |
| Record high (1991–2020) | 31 °C |
| Record low (1991–2020) | 14 °C |
| Relative humidity | 77 % |
| Wind speed | 9.7 km/h |
| Cloud cover | 69 % |
April compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| February | 25.5 °C | 66 mm | 49 % |
| March | 26.5 °C | 61 mm | 54 % |
| April | 26.5 °C | 99 mm | 69 % |
| May | 24.9 °C | 355 mm | 89 % |
| June | 24.3 °C | 383 mm | 92 % |
See all twelve months for San José
- April is the warmest month in San José.
- It is the 4th driest month of the year.
- It ranks 5th for least cloud cover.
- Days last about 12 hours from sunrise to sunset.
- It rains on 17 of 30 days — 55 % of the month.
- Nights are about 8.7 °C cooler than the middle of the day.
- The hottest April day on record since 1991 reached 31 °C, 4.1 °C above the usual daytime high.
QuestionsApril in San José, answered
How warm is San José in April?
Daily highs average 27 °C and nights fall to about 18 °C, a spread of 8.7 °C between afternoon and dawn. That makes April the 1st warmest month of the year here.
Does it rain much in San José in April?
April averages 99 mm of rain, spread over about 17 of the 30 days — 55 % of the month. Cloud cover averages 69 % of the sky.
How long are the days in April?
San José averages 12 hours between sunrise and sunset in April. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.