11-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Morning
Partly cloudy
17°
Feels like 17°
Wind↑ N 1 km/h
Humidity 54 %
Evening
Partly cloudy
14°
Feels like 14°
Wind↑ S 9 km/h
Gusts15 km/h
Humidity 60 %
12-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Morning
Partly cloudy
17°
Feels like 17°
Wind↑ S 15 km/h
Gusts34 km/h
Humidity 65 %
Evening
Rain
14°
Feels like 14°
Wind↑ S 15 km/h
Gusts47 km/h
Humidity 92 %
💧 9.5 mm
13-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Morning
Rain
14°
Feels like 14°
Wind↑ SW 28 km/h
Gusts52 km/h
Humidity 92 %
💧 13.4 mm
Evening
Light rain
11°
Feels like 11°
Wind↑ SW 12 km/h
Gusts32 km/h
Humidity 90 %
💧 3.8 mm
14-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
San Jose forecast in charts · next 7 days
The week ahead: highs and lows
≈ A week close to the usual temperatures
Highs Lows Usual for the season (1991–2020 average)
Hourly detail
Temperature (°C) Rain (mm) Wind (km/h)
San Jose climate: what a normal year looks like
The wet season is concentrated from December to February, which brings 58% of the annual total; February by itself averages 117 mm.
From June to September, rain is scarce: under 10 mm a month on average.
The hottest stretch is August, when afternoons average 27 °C; the coldest is December, when nights average 5 °C.
From 14 h 44 min of daylight in late June to 9 h 35 min in late December.
Forecast highs for the coming week average 20 °C, 3 °C cooler than a normal October (23 °C).
30-year averages (1991–2020)
Month
Typical high
Typical low
Rainfall
Jan
13 °C
5 °C
114 mm
Feb
15 °C
6 °C
117 mm
Mar
16 °C
7 °C
90 mm
Apr
18 °C
8 °C
44 mm
May
21 °C
10 °C
22 mm
Jun
24 °C
12 °C
5 mm
Jul
27 °C
14 °C
1 mm
Aug
27 °C
14 °C
2 mm
Sep
26 °C
14 °C
3 mm
Oct
23 °C
12 °C
28 mm
Nov
18 °C
8 °C
53 mm
Dec
13 °C
5 °C
103 mm
Whole year
20 °C
10 °C
580 mm
Source: our own processing of the ERA5 reanalysis (Copernicus/ECMWF) for 37.34° N, 121.89° W, 1991–2020. ERA5 averages over a 0.25° grid (about 25 km): hills, a coastline or the heat of the city itself can shift local values by a degree or two.
Air you breathe in San Jose: pollution and pollen
1/6
Good
European Air Quality Index (EAQI), from Copernicus CAMS
PM2.54µg/m³
PM104µg/m³
Copernicus CAMS model, updated several times a day.
Rain radar around San Jose
Rain observed over the last two hours by official weather radars around San Jose, followed by the radar forecast for the next hour where the weather service provides one.
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Rain radarLast two hours, then forecast where available · drag the timeline
Moon over San Jose
Waning gibbous
87 % illuminated · 18.3 days
Rise 22:47 Set 13:45
Fri30/1079%
Sat31/1069%
Sun1/1159%
Mon2/1149%Last quarter
Tue3/1138%
Wed4/1128%
Thu5/1119%
Fri6/1112%
Sat7/116%
Sun8/112%
Mon9/110%
Tue10/111%New moon
Moonrise and moonset in local time (America/Los_Angeles); phase and lit fraction from a synodic calculation.
Look up a past day in San Jose
Curious about the weather in San Jose on a given day? Choose a date: we read it from the ERA5 reanalysis (ECMWF / Copernicus C3S), which runs until about a week ago.
San Jose weather at a glance
This page gathers everything about the weather in San Jose, CA: conditions now, the forecast for each part of the day and the trend for the coming week. At the moment the sky is “partly cloudy”, it is 9 °C (feels like 9 °C) and the wind blows at 3 km/h.
Expected range today: 9 °C to 21 °C and a dry sky. The forecast comes from the AtmoAtlas engine, which combines ECMWF-AIFS, NOAA GFS and DWD ICON, adjusts cloud cover with METAR reports and uses convective energy (CAPE) to flag storms.
Use the San Jose forecast in your own website or app: one JSON call returns weather, air quality, tides and sun and moon times. The free key needs no card.
