El Niño in San José
During El Niño, San José gets on average 28% less rain in June–August than in neutral years (413 mm vs 575 mm).
Weather in San José: next 7 days
San José
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Weather forecast: MET Norway (CC BY 4.0), updated every hour. For official warnings, follow your national weather service.
El Niño is active right now: the El Niño columns show what San José typically sees in this phase.
Monthly rainfall by phase
El NiñoNeutralLa Niña
Month by month
| Month | El Niño | Neutral | La Niña | Change El Niño | Temp. El Niño / neutral |
|---|---|---|---|---|---|
| January | 23 mm | 26 mm | 36 mm | -11% | 23.6 / 23.0 °C |
| February | 18 mm | 16 mm | 24 mm | +9% | 24.4 / 23.8 °C |
| March | 21 mm | 26 mm | 35 mm | -21% | 25.6 / 24.8 °C |
| April | 61 mm | 70 mm | 92 mm | -13% | 25.9 / 25.3 °C |
| May | 183 mm | 217 mm | 144 mm | -16% | 24.5 / 24.4 °C |
| June | 152 mm | 219 mm | 192 mm | -31% | 23.9 / 23.6 °C |
| July | 138 mm | 166 mm | 179 mm | -17% | 23.7 / 23.3 °C |
| August | 123 mm | 190 mm | 211 mm | -35% | 23.6 / 23.3 °C |
| September | 176 mm | 219 mm | 278 mm | -20% | 23.3 / 22.9 °C |
| October | 241 mm | 218 mm | 274 mm | +11% | 22.8 / 22.6 °C |
| November | 120 mm | 169 mm | 169 mm | -29% | 22.9 / 22.6 °C |
| December | 49 mm | 52 mm | 67 mm | -5% | 23.1 / 22.8 °C |
NASA POWER (MERRA-2), 1981–2025, classified by NOAA ONI. Averages, not a forecast.
Frequently asked questions
How does El Niño affect San José?
During El Niño, San José gets on average 28% less rain in June–August than in neutral years (413 mm vs 575 mm).
And La Niña?
In June–August, La Niña years average 581 mm, compared with 575 mm in neutral years.
Where does this data come from?
Monthly rainfall and temperature from NASA POWER (MERRA-2 reanalysis, 1981–2025) at 9.93, -84.08, classified by NOAA's Oceanic Niño Index for each month. These are averages; each event is different.