---
title: "Stock Market Today: September Starts Weak as All Major Indexes Slip"
type: "News"
locale: "en"
url: "https://longbridge.com/en/news/255754470.md"
description: "U.S. markets began September on a weak note, with all major indexes declining due to seasonal weakness and rising yields. The S&P 500 fell 0.69%, the Nasdaq Composite dropped 0.82%, and the Dow Jones Industrial Average decreased by 0.55%. Analysts note the \"September Effect,\" where the S&P typically declines 0.8% this month. Political tensions and concerns over government debt add to the cautious sentiment, as traders await key economic reports that may impact Federal Reserve policy."
datetime: "2025-09-03T09:39:47.000Z"
locales:
  - [zh-CN](https://longbridge.com/zh-CN/news/255754470.md)
  - [en](https://longbridge.com/en/news/255754470.md)
  - [zh-HK](https://longbridge.com/zh-HK/news/255754470.md)
---

> Supported Languages: [简体中文](https://longbridge.com/zh-CN/news/255754470.md) | [繁體中文](https://longbridge.com/zh-HK/news/255754470.md)


# Stock Market Today: September Starts Weak as All Major Indexes Slip

****

Data by YCharts

U.S. markets opened September on a defensive note, as seasonal weakness and rising yields weighed on stocks across all three benchmarks.

The **S&P 500** (^GSPC -0.69%) lost 0.69% to 6,415.54, while the **Nasdaq Composite** (^IXIC -0.82%) slid 0.82% to 21,279.63--its steeper drop highlighting tech-sector vulnerability amid elevated bond yields and renewed worries over inflation and tariff uncertainty. The **Dow Jones Industrial Average** (^DJI -0.55%) also slipped, down 0.55% to 45,295.81, underscoring a broad risk-off tone as investors reposition ahead of what is historically the weakest month for equities.

Seasonal headwinds are already in motion: analysts reference the long‑standing "September Effect," where the S&P often declines an average of 0.8% during the month. This year, political tensions over Fed independence and concerns about government debt only amplify the downside bias.

Traders are turning their attention to upcoming economic reports--including jobs data and inflation updates--that could influence the Federal Reserve's next policy steps. Seasonal headwinds combined with persistent macro uncertainty leave September starting on a cautious note.

_Market data sourced from Google Finance on Tuesday, Sept. 2, 2025._

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