Climate Chart of San Jose, USA

Monthly data: Temperature °C, Rain (mm), Sunshine (h) · 2013–2023

For San Jose, USA, the climate data cover 2013–2023. Monthly mean temperatures range from 10.1 °C in December to 20.8 °C in August, giving a broad sense of the year's temperature pattern without describing daytime highs. Rainfall averages are also strongly differentiated by month, while daily sunshine duration varies over the year. Together, these figures provide useful planning context, but monthly means cannot predict the conditions on a particular day.

Climate overview

Temperature

The warmest monthly mean is 20.8 °C in August, while the coolest is 10.1 °C in December. These are averages for the months, not daytime maximum temperatures, so they describe the broader temperature backdrop rather than the hottest or coldest conditions a visitor might encounter. Across the calendar-month means, the unweighted mean is 15.7 °C; it is not a day-weighted annual average.

Rain

Mean daily rainfall is lowest at 0.01 mm/day in August and highest at 3.85 mm/day in December. These daily averages are not monthly totals and do not indicate how often rain falls, so the lower average does not guarantee dry days. The unweighted mean across monthly means is 1.41 mm/day, a broad summary rather than a day-weighted annual figure.

Sunshine

Average daily sunshine reaches its monthly high of 13.23 hours/day in June and its low of 6.85 hours/day in December. This variation can help with planning outdoor time, though sunshine duration is not the same as day length and monthly averages cannot promise clear conditions on a particular date. The unweighted mean across monthly sunshine averages is 10.23 hours/day.

Snow

The highest monthly mean daily snowfall is 0.08 mm/day in February, and the unweighted mean across monthly means is 0.01 mm/day. These small recorded averages do not establish how many snowy days occur, snow depth or snow cover, and they are not evidence of skiing conditions.

Best Travel Time Guide for San Jose, USA: Ideal Seasons and Weather Insights

Visitors prioritising lower average rainfall could consider August, when mean daily rainfall is 0.01 mm/day; this is a conditional choice, not a guarantee of dry weather or a measure of rain frequency. For rain preparation, note that the highest monthly mean daily rainfall is 3.85 mm/day in December, so flexible plans and suitable rain protection may be useful. For cooler monthly mean temperatures, December is the relevant option, with a mean of 10.1 °C. Those averages do not describe daytime highs or the conditions of any particular day, so check a forecast closer to travel and pack for variation rather than treating the monthly figure as a guarantee.

For outdoor sightseeing planned around average sunshine, June has the highest mean daily sunshine duration at 13.23 hours/day, while December has the lowest at 6.85 hours/day. These figures may help guide daylight outdoor planning, but sunshine duration is not day length and does not ensure sunny skies; choose timing according to this criterion rather than as a universal best time to visit. The recorded snowfall mean peaks at 0.08 mm/day per day in February. This average cannot tell you the number of snowy days or establish snow depth or cover, so it should not be used to plan for snow activities.

Climate Data Overview for San Jose, USA

Explore the comprehensive climate data for San Jose, USA. This detailed table provides valuable insights into temperature variations, precipitation levels, and seasonal changes, helping you understand the unique weather patterns of this region.

Month	Average: Temperature °C	Rain (mm) / day	Snow (mm) / day	Sunshine (h) / day
Jan	10.4	3.24	0.00	7.16
Feb	11.1	2.77	0.08	8.48
Mar	12.6	2.79	0.00	9.32
Apr	14.4	1.04	0.00	10.93
May	16.5	0.38	0.00	12.20
Jun	19.7	0.04	0.00	13.23
Jul	20.6	0.05	0.00	13.18
Aug	20.8	0.01	0.00	12.27
Sep	20.5	0.20	0.00	11.17
Oct	18.1	0.97	0.00	9.76
Nov	13.3	1.61	0.00	8.22
Dec	10.1	3.85	0.00	6.85
Average	15.7	1.41	0.01	10.23