30YearWeather
San Jose in September
San Jose weather in September - United States
😊Warm & Pleasant

San Jose Weather in September

Plan your September trip to San Jose, United States. Based on 30 years of NASA data, expect temperatures of 28°C (high) to 15°C (low), with 1% rain probability and 8 hours of daily sunshine. Great conditions with only 0 rainy days expected.

Avg High
28°C

Hottest around day 6

Avg Low
15°C

Coolest around day 15

Rainy Days
0days

1% avg rain chance

Sunshine
8hrs/day

Autumn season

San Jose September Weather Calendar

Click any day to see detailed weather information

Day 1
clear-day
Sunny
29°C0%
Day 2
clear-day
Sunny
29°C0%
Day 3
clear-day
Sunny
29°C0%
Day 4
clear-day
Sunny
29°C0%
Day 5
clear-day
Sunny
29°C0%
Day 6
clear-day
Sunny
30°C0%
Day 7
clear-day
Sunny
30°C0%
Day 8
clear-day
Sunny
30°C0%
Day 9
clear-day
Sunny
29°C1%
Day 10
clear-day
Sunny
29°C1%
Day 11
clear-day
Sunny
28°C2%
Day 12
clear-day
Sunny
28°C2%
Day 13
clear-day
Sunny
28°C2%
Day 14
clear-day
Sunny
27°C1%
Day 15
clear-day
Sunny
27°C1%
Day 16
clear-day
Sunny
26°C2%
Day 17
clear-day
Sunny
26°C2%
Day 18
clear-day
Sunny
27°C2%
Day 19
clear-day
Sunny
27°C2%
Day 20
clear-day
Sunny
28°C2%
Day 21
clear-day
Sunny
28°C1%
Day 22
clear-day
Sunny
28°C1%
Day 23
clear-day
Sunny
28°C1%
Day 24
clear-day
Sunny
28°C1%
Day 25
clear-day
Sunny
28°C0%
Day 26
clear-day
Sunny
28°C0%
Day 27
clear-day
Sunny
27°C0%
Day 28
clear-day
Sunny
27°C0%
Day 29
clear-day
Sunny
27°C1%
Day 30
clear-day
Sunny
27°C2%

Currency

USD

$ United States dollar

Language

English

Driving

Right side

Safety

Moderate Safety

GPI: 2.44

Travel Intelligence

Exclusive flight analytics & health data for San Jose

Smart Flight Estimator

Airport-to-Airport Logistics

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Flight Connectivity Analysis

Airport traffic data & seasonal patterns

Moderate
51/ 100
Traffic Index

Balanced traffic

Peak Daily Arrivals

0

slots per day

Peak

Jun

Low

Jul

Monthly Traffic Distribution

126
Jan
133
Feb
139
Mar
175
Apr
202
May
209
Jun
124
Jul
158
Aug
158
Sep
158
Oct
158
Nov
158
Dec
Traffic Level
Low Season

Key Connections

San Diego (SAN)
Los Angeles (LAX)
Las Vegas McCarran (LAS)
Phoenix Sky Harbor (PHX)
Seattle Tacoma (SEA)

Health & Safety Advisory

CDC travel health recommendations

No Requirements

No Special Vaccinations Required

Standard travel precautions apply

Source: CDC Travelers' Health

View Complete Health Guide

Is September a Good Time to Visit San Jose?

👍Solid choice for most travelers
Short Answer

San Jose shines in September with 28°C pleasant temperatures and minimal 1% rain chance. Expect 11.2 hours of sunshine daily - pack light layers for evenings.

Decision Factors

Excellent dry conditions

Only 1% rain probability - ideal for outdoor activities

Plenty of sunshine

11.2h of sunshine daily

Shoulder season - balanced conditions

76% of peak - good value with moderate crowds

Exceptional dining scene

13 Michelin-listed restaurants

Good For

  • 👨‍👩‍👧‍👦
    Families with children

    Comfortable 28°C temperatures and low 1% rain risk

  • 🥾
    Outdoor enthusiasts

    Ideal hiking conditions: 28°C, 1% rain chance

  • 📸
    Photographers

    11.2h sunshine, 77% clear skies for golden hour shots

  • 🏛️
    Cultural tourists

    Comfortable conditions for exploring museums and sites

  • 💑
    Honeymoon couples

    Wedding score 100/100 with romantic weather conditions

Who Should Avoid

Suitable for most traveler types

900 observations30-year historical data
Confidence: 95%

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,San Jose in September averages 28°C with 1% precipitation probability."

📊 Source: 30YearWeather.com🛰️ Data: NASA POWER (1991-2021)View Methodology →

Frequently Asked Questions: San Jose in September

What are the temperatures in San Jose in September?

Daytime highs average 28°C, nights drop to 15°C. There's a significant day/night temperature swing.

How many rainy days in San Jose in September?

Expect around 0 days with measurable rainfall. Rain is unlikely to disrupt plans.

What to wear in San Jose in September?

Comfortable casual wear with a light jacket for evenings.

Is September peak season in San Jose?

This is typically peak season with higher prices. Book 2-3 months ahead.