September is an ideal time to visit San Jose if you're seeking a destination with brilliant weather. Anticipate average maximum temperatures of +81°F and about 14 sunny days, ensuring you'll have ample opportunities to soak up the sunshine. It's worth noting, though, that there may be some rainfall, with approximately 6 mm of precipitation over an average of 2 rainy days. So, prepare your sunglasses, a beach towel, and great walking shoes, as it's most likely going to be amazing weather. Search flightsin one click on Avionero.
Average weather
☀️
+81°F
Avg. max. temperature
+48°F
Min.
+109°F
Max.
6 mm
Total precipitation
64%
Avg. humidity
2 m/s
Avg. wind
14 ☀️
Sunny Days
14 ⛅️
Cloudy
2 🌦
Rainy
Our opinion: San Jose has great weather in September.
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Average temperature in San Jose in September
Here are the expected maximum, average and minimum temperatures in San Jose for September based on the historical data.
Last Year
Historical Data
Going from a maximum of +88°F during the day to a minimum of +52°F during the night, the temperature in September averages around +81°F.
The average maximum temperature goes down 20% by the end of the month, compared with the beginning of the month, from +79°F to +72°F.
Is San Jose warm or cold in September?
San Jose is typically warm in September.
Maximum temperatures go down compared to the previous month from +82°F to +81°F. The minimum temperature also goes up from +59°F to +59°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
September is one of the warmest months in San Jose, here is the comparison with other months:
Climate in San Jose in September
San Jose weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+82°F
+81°F
+75°F
Min. temperature
+50°F
+48°F
+41°F
Max. temperature
+104°F
+109°F
+102°F
Rainfall
10 mm
6 mm
28 mm
Wind
2 m/s
2 m/s
1 m/s
Humidity
66%
64%
64%
Air pressure
1013 HPa
1012 HPa
1015 HPa
Sunny days
15
14
13
Cloudy days
15
14
13
Rainy days
1
2
5
Snowy days
0
0
0
September weather is still as great as in August.It’s getting colder in September. From +82°F in the day, the average maximum temperature lowers to +81°F.As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 10 mm to 6 mm.It feels drier, as humidity decreases from 66% to 64%.The average wind speed doesn’t change much during September, staying around 2 m/s.The days becoming less sunny, going from 15 sunny days in August to 14 in September.
Next month (October) brings a further decline in the weather.
Wind speed in San Jose in September based on historical data.
Last Year
Historical Data
The average wind speed is 8 m/s getting up to 15 m/s which is quite strong. The wind will cause branches to move and ground debris to fly around.
The average wind speed in San Jose is gradually decreasing during September, going from 12 m/s to 11 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in San Jose based on historical data.
Last Year
Historical Data
Typically, there is a 7% chance of rain on an average day in September, with total rainfall of approximately 7 mm. The maximum amount of rainfall per day is around 6 mm, which is considered light rain.San Jose is amazing in September with as little as 2 rainy days on average, so plan adventures in the great outdoors.
Here’s how September is compared with other months in the amount of precipitation, total mm:
San Jose wettest month is February, where a typical day has a 43% chance of precipitation and 125 mm of rainfall per day. September, on the other hand, is the driest month with a mere 7% chance of precipitation and 6 mm of rainfall per day.
How was the weather last September in San Jose?
This is the weather in San Jose in September 2024:
1 September
☁️
+79°F
2 September
☁️
+72°F
3 September
☁️
+75°F
4 September
☀️
+81°F
5 September
☀️
+86°F
6 September
☀️
+84°F
7 September
☀️
+84°F
8 September
☀️
+88°F
9 September
☀️
+86°F
10 September
☀️
+85°F
11 September
☀️
+86°F
12 September
☀️
+85°F
13 September
☀️
+86°F
14 September
☀️
+86°F
15 September
☀️
+82°F
16 September
☁️
+79°F
17 September
☁️
+77°F
18 September
☀️
+78°F
19 September
☀️
+79°F
20 September
🌫️
+80°F
21 September
🌫️
+80°F
22 September
☀️
+78°F
23 September
☀️
+77°F
24 September
☀️
+77°F
25 September
☀️
+80°F
26 September
☁️
+78°F
27 September
☀️
+77°F
28 September
☀️
+80°F
29 September
☀️
+78°F
30 September
🌧️
+71°F
In September 2024 San Jose had 21 sunny days, 6 cloudy days, and 1 rainy days. The average maximum temperature was +81°F, with an absolute maximum of +88°F and a minimum of +72°F. The average humidity was 65%, with a maximum of 100% and a minimum of 27%. The average wind speed was 8 m/s, with a maximum of 29 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change Over the Years
This is how San Jose climate has changed over the last 43 years.
The climate in San Jose in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1982 (+67°F) and the highest in 2024 (+75°F). The driest year was 2013 with only 147 mm of rainfall, and the wettest year was 2020 with 4306 mm.
FAQ
Frequently asked questions about the weather in San Jose in September:
Is September a good time to visit San Jose?
Yes, September is a great time to go to San Jose, the weather couldn’t be better. Be ready to get outside, explore and enjoy. Check what other months that are a good time to visit San Jose.
Can you sunbathe in San Jose in September?
September is warm in San Jose. You may enjoy some beach or pool time in the day, but pack something a tad warmer for the evening.
Is San Jose rainy in September?
San Jose is usually dry in September. Plan your packing around outdoor activities and exploring.
Is it sunny in San Jose in September?
The amount of sunny days in San Jose during September varies; prepare for a mix of clouds and sun.
For this page, we’ve looked at the typical weather in San Jose, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
