easeweather.com
San Jose (CA)
Akron (OH)Albuquerque (NM)Alexandria (VA)Anaheim (CA)Anchorage (AK)Arlington (VA)Atlanta (GA)Atlantic City (NJ)Austin (TX)Baltimore (MD)Baton Rouge (LA)Birmingham (AL)Boston (MA)Brooklyn (NY)Buffalo (NY)Cape Coral (FL)Charlotte (NC)Chattanooga (TN)Chicago (IL)Cincinnati (OH)Cleveland (OH)Colorado Springs (CO)Columbus (OH)Corpus Christi (TX)Dallas (TX)Dayton (OH)Denver (CO)Des Moines (IA)Detroit (MI)El Paso (TX)Fairbanks (AK)Fayetteville (NC)Fort Lauderdale (FL)Fort Wayne (IN)Fort Worth (TX)Gatlinburg (TN)Grand Rapids (MI)Harrisburg (PA)Honolulu (HI)Houston (TX)Huntsville (AL)Indianapolis (IN)Jackson (MS)Jacksonville (FL)Juneau (AK)Kansas City (MO)Ketchikan (AK)Key West (FL)Knoxville (TN)Las Vegas (NV)Lexington (KY)Lincoln (NE)Little Rock (AR)Los Angeles (CA)Louisville (KY)Madison (WI)Manhattan (NY)Memphis (TN)Miami (FL)Milwaukee (WI)Minneapolis (MN)Mobile (AL)Montgomery (AL)Nashville (TN)New Orleans (LA)New York City (NY)Newark (NJ)Norfolk (VA)Oklahoma City (OK)Omaha (NE)Orlando (FL)Philadelphia (PA)Phoenix (AZ)Pittsburgh (PA)Portland (OR)Richmond (VA)Riverside (CA)Sacramento (CA)Salt Lake City (UT)San Antonio (TX)San Diego (CA)San Francisco (CA)
San Jose (CA)
Savannah (GA)Seattle (WA)Sitka (AK)Skagway (AK)Springfield (MO)St. Louis (MO)St. Petersburg (FL)Tallahassee (FL)Tampa (FL)Toledo (OH)Traverse City (MI)Tulsa (OK)Tyler (TX)Vancouver (WA)Virginia Beach (VA)WashingtonWichita (KS)Winston-Salem (NC) More Locations
United States weather

Weather in San Jose, California for September 2025

Your guide to San Jose weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in San Jose is cooler than usual, with temperatures averaging 24.1 °F, this is -3.9 °F below the typical seasonal average.

  • The forecast for the upcoming days in San Jose predicts a temperature of 29.4 °F, which is slightly above the historical average.

  • In general, the average temperature in San Jose at the beginning of September is 29.1 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 27.1 °F by the end of September.

    • Rain 🌧️

  • With an average of 2 rainy days, San Jose experiences minimal rainfall in September.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
28
Dry days
Average rainy days
2
Rainy days
Average snowy days
0
Snow days
Average temperatures
28°/14°
Temperatures
Average wind speed
11 km/h
Avg max wind
Average humidity
59 %
Avg humidity

San Jose Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
28°
2
Sunny
28°
3
Overcast
30°
4
Mist
31°
5
Cloudy
29°
6
Sunny
30°
7
Partly cloudy
28°
8
Partly cloudy
27°
9
Partly cloudy
27°
10
Cloudy
26°
11
Cloudy
25°
12
Overcast
27°
13
Mist
27°
14
Cloudy
27°
15
Sunny
32°
16
Sunny
35°
17
Sunny
33°
18
Sunny
34°
19
Sunny
28°
20
Sunny
28°
21
Sunny
27°
22
Sunny
31°
23
Partly cloudy
30°
24
Patchy rain possible
24°
25
Sunny
30°
26
Patchy rain possible
23°
27
Mist
30°
28
Cloudy
28°
29
Overcast
28°
30
Light rain shower
27°

Temperatures trend during September in San Jose

See the weather trend as well as the moving average line

September weather in San Jose day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 28° /15° 0 mm 7
Sept. 2 Sunny
Sunny
 28° /14° 0 mm 7
Sept. 3 Overcast
Overcast
 30° /14° 0 mm 7
Sept. 4 Mist
Mist
 31° /15° 0 mm 7
Sept. 5 Cloudy
Cloudy
 29° /14° 0 mm 7
Sept. 6 Sunny
Sunny
 30° /14° 0 mm 7
Sept. 7 Partly cloudy
Partly cloudy
 28° /15° 0 mm 7
Sept. 8 Partly cloudy
Partly cloudy
 27° /14° 0 mm 7
Sept. 9 Partly cloudy
Partly cloudy
 27° /14° 0 mm 7
Sept. 10 Cloudy
Cloudy
 26° /13° 0 mm 6
Sept. 11 Cloudy
Cloudy
 25° /13° 0 mm 6
Sept. 12 Overcast
Overcast
 27° /13° 0 mm 6
Sept. 13 Mist
Mist
 27° /13° 0 mm 7
Sept. 14 Cloudy
Cloudy
 27° /15° 0 mm 1.8
Sept. 15 Sunny
Sunny
 32° /17° 0 mm 1.8
Sept. 16 Sunny
Sunny
 35° /18° 0 mm 1.8
Sept. 17 Sunny
Sunny
 33° /16° 0 mm 1.7
Sept. 18 Sunny
Sunny
 34° /17° 0.1 mm 0
Sept. 19 Sunny
Sunny
 28° /14° 0 mm 5
Sept. 20 Sunny
Sunny
 28° /13° 0 mm 5
Sept. 21 Sunny
Sunny
 27° /13° 0 mm 5
Sept. 22 Sunny
Sunny
 31° /15° 0 mm 6
Sept. 23 Partly cloudy
Partly cloudy
 30° /16° 0 mm 6
Sept. 24 Patchy rain possible
Patchy rain possible
 24° /16° 3 mm 4
Sept. 25 Sunny
Sunny
 30° /14° 0 mm 6
Sept. 26 Patchy rain possible
Patchy rain possible
 23° /14° 0.1 mm 4
Sept. 27 Mist
Mist
 30° /13° 0 mm 7
Sept. 28 Cloudy
Cloudy
 28° /14° 0 mm 7
Sept. 29 Overcast
Overcast
 28° /13° 0 mm 7
Sept. 30 Light rain shower
Light rain shower
 27° /14° 1 mm 6
Next
Important Notice
Our weather forecast for San Jose in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the San Jose forecast closer to your planned date for the most up-to-date weather information.
Change Month
‹
›

San Jose in September - FAQ

What are the expected maximum and minimum temperatures in San Jose during September?
Enjoy moderate daytime temperatures of up to 28° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in San Jose during September?
Rainfall in San Jose during September is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 2 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.
What are the typical wind conditions in San Jose during September?
The average wind speed in San Jose during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in San Jose

Explore the daily rainfall trends and prepare for San Joses September weather 💧

UV exposure in San Jose during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

Quick links

More San Jose weather pages
You are here
Location coordinates Where is San Jose?

Get accurate weather forecasts for San Jose, located at latitude 37.339 and longitude -121.895. Stay updated with localized weather information tailored for San Jose.

Found a mistake?
We appreciate your attention to details. Tell us here.