San Jose weather in April
In April, San Jose has daytime highs averaging 20 °C, nights around 9.4 °C, with 5.9 wet days. Figures are 1991–2020 climate normals.
- 20.0°C Average high
- 9.4°C Average low
- 5.9days Wet days
- 48mm Rainfall
- 13h 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 | 18.7 °C | 8.6 °C | 24 % |
| 11–20 April | 19.6 °C | 9.3 °C | 20 % |
| 21–30 April | 21.4 °C | 10.2 °C | 16 % |
- Average highs rise from 18.7 °C early in April to 21.4 °C by the end of it.
- Rain is most likely over days 1–10 of April (24 % of days) and least likely over days 21–30 (16 %).
What to expect
| Measure | Typical April | Share of the month |
|---|---|---|
| Days above 25 °C | 4.4 of 30 | 15 % |
| Days above 30 °C | 0.7 of 30 | 2 % |
| Days below 0 °C | 0 of 30 | 0 % |
| Days with more than 1 mm rain | 5.9 of 30 | 20 % |
Conditions in April
| Measure | Average |
|---|---|
| Mean temperature | 14 °C |
| Record high (1991–2020) | 35 °C |
| Record low (1991–2020) | 2.1 °C |
| Relative humidity | 71 % |
| Wind speed | 15 km/h |
| Cloud cover | 49 % |
Where San Jose ranks in April
| Ranking | Position | Value |
|---|---|---|
| Places with the best weather in North America in April | 34th of 50 | 90/100 |
April compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| February | 16.3 °C | 127 mm | 58 % |
| March | 18.0 °C | 95 mm | 57 % |
| April | 20.0 °C | 48 mm | 49 % |
| May | 22.8 °C | 22 mm | 43 % |
| June | 26.3 °C | 4 mm | 29 % |
See all twelve months for San Jose
- April is the 7th warmest month here.
- It is the 7th driest month of the year.
- It ranks 8th for least cloud cover.
- Days last about 13 hours from sunrise to sunset.
- It rains on 5.9 of 30 days — 20 % of the month.
- Nights are about 11 °C cooler than the middle of the day.
- The hottest April day on record since 1991 reached 35 °C, 15 °C above the usual daytime high.
QuestionsApril in San Jose, answered
How warm is San Jose in April?
Daily highs average 20 °C and nights fall to about 9.4 °C, a spread of 11 °C between afternoon and dawn. That makes April the 7th warmest month of the year here.
Does it rain much in San Jose in April?
April averages 48 mm of rain, spread over about 6 of the 30 days — 20 % of the month. Cloud cover averages 49 % of the sky.
How long are the days in April?
San Jose averages 13 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.