San José tiene un clima muy placentero con temperaturas que oscilan entre moderadas y suaves, rondando 20 grados ºC, a lo largo de todo el año. Este clima casi perfecto hace de la provincia de San José una de las mas pobladas de Costa Rica.
<center><!--Infobox begins-->{{Infobox Weather
|metric_first= Yes <!--Entering Yes will display metric first. Leave blank for imperial-->
|single_line= Yes
|location=San José, Costa Rica
|Jan_Hi_°C = 25
|Feb_Hi_°C = 26
|Mar_Hi_°C = 28
|Apr_Hi_°C = 30
|May_Hi_°C = 30
|Jun_Hi_°C = 28
|Jul_Hi_°C = 28
|Aug_Hi_°C = 28
|Sep_Hi_°C = 27
|Oct_Hi_°C = 26
|Nov_Hi_°C = 26
|Dec_Hi_°C = 25
|Jan_Lo_°C = 15
|Feb_Lo_°C = 15
|Mar_Lo_°C = 17
|Apr_Lo_°C = 19
|May_Lo_°C = 19
|Jun_Lo_°C = 18
|Jul_Lo_°C = 18
|Aug_Lo_°C = 17
|Sep_Lo_°C = 17
|Oct_Lo_°C = 17
|Nov_Lo_°C = 16
|Dec_Lo_°C = 15
|Jan_Precip_mm = 15
|Feb_Precip_mm = 5
|Mar_Precip_mm = 20
|Apr_Precip_mm = 46
|May_Precip_mm = 229
|Jun_Precip_mm = 241
|Jul_Precip_mm = 211
|Aug_Precip_mm = 241
|Sep_Precip_mm = 305
|Oct_Precip_mm = 300
|Nov_Precip_mm = 145
|Dec_Precip_mm = 41
|source = BBC Weather<ref name=BBCWeather>{{cite web
|url=http://www.bbc.co.uk/weather/world/city_guides/results.shtml?tt=TT001810|title=San José |accessdate=2008-06-24|publisher=BBC Weather Centre }}</ref> <!--All units above have been rounded to nearest whole number-->
