# Rainfall Totals in San Marcos, TX 78666

As of 2026-11-04T17:32:06.463Z, **San Marcos, TX 78666** received **0.00" of rain** in the last 24 hours, **1.79"** over the past 7 days, and **33.01"** in 2026 year-to-date (30-year normal to date: 31.08", 6.2% above average). The most recent rain event ended 1 day ago (2026-11-03T15:00:00+0000), dropping 0.30" of rain.

> **Note on local variation:** These totals are measured at the center of San Marcos, TX 78666 (29.8780, -98.0100). Because thunderstorms often vary by 1"+ across a few miles, [pin your exact address, yard, or field in the free Precip app](https://app.precip.ai/locations/coords?lng=-98.010012&lat=29.877963&locationName=San+Marcos%2C+TX+78666&save=true&src=md_rain_report) for exact point totals, or [check the next-hour rain nowcast and 10-day forecast for San Marcos, TX 78666](https://app.precip.ai/home?lng=-98.010012&lat=29.877963&locationName=San+Marcos%2C+TX+78666&src=md_rain_forecast).

| Period | Rainfall | 30-Year Normal | vs. Normal |
| --- | --- | --- | --- |
| Last 24 hours | 0.00" | — | — |
| Full day (Tue, Nov 3) | 0.10" | — | — |
| Past 7 days | 1.79" | — | — |
| November 2026 (to date) | 0.30" | 0.53" | −0.24" (−44%) |
| 2026 year to date | 33.01" | 31.08" | +1.93" (6.2% above average) |
| Most recent rain (1 day ago) | 0.30" | — | — |

## Daily Rainfall — Past 7 Days

Each precipitation day runs 24 hours from 12:00 UTC to 12:00 UTC.

| Date | ISO Date | Rainfall |
| --- | --- | --- | --- |
| Wednesday, Nov 4 | 2026-11-04 | 0.00" |
| Tuesday, Nov 3 | 2026-11-03 | 0.10" |
| Monday, Nov 2 | 2026-11-02 | 0.20" |
| Sunday, Nov 1 | 2026-11-01 | 0.00" |
| Saturday, Oct 31 | 2026-10-31 | 0.00" |
| Friday, Oct 30 | 2026-10-30 | 1.05" |
| Thursday, Oct 29 | 2026-10-29 | 0.44" |

## Monthly Rainfall — 2026 vs. 30-Year Normal

| Month | Observed | Normal to Date | vs. Normal | Full Month Normal |
| --- | --- | --- | --- | --- |
| January 2026 | 1.15" | 2.32" | −1.17" (−50%) | 2.32" |
| February 2026 | 0.48" | 1.86" | −1.38" (−74%) | 1.86" |
| March 2026 | 0.78" | 2.76" | −1.99" (−72%) | 2.76" |
| April 2026 | 8.83" | 2.75" | +6.08" (+221%) | 2.75" |
| May 2026 | 4.61" | 4.35" | +0.27" (+6%) | 4.35" |
| June 2026 | 4.62" | 3.50" | +1.12" (+32%) | 3.50" |
| July 2026 | 6.75" | 2.51" | +4.25" (+170%) | 2.51" |
| August 2026 | 1.54" | 2.48" | −0.93" (−38%) | 2.48" |
| September 2026 | 0.18" | 3.83" | −3.65" (−95%) | 3.83" |
| October 2026 | 3.77" | 4.20" | −0.43" (−10%) | 4.20" |
| November 2026 (to date) | 0.30" | 0.53" | −0.24" (−44%) | 2.78" |

## Track San Marcos, TX 78666 in the Free Precip App

This summary covers standard periods at the center of San Marcos, TX 78666. Open [San Marcos, TX 78666 in the Precip app](https://app.precip.ai/locations/coords?lng=-98.010012&lat=29.877963&locationName=San+Marcos%2C+TX+78666&save=true&src=md_rain_report) (iOS, Android, and Web — rated 4.8/5 from 10463+ reviews) for:

- **Exact-coordinate virtual rain gauge:** [Drop a pin on any yard, field, or job site](https://app.precip.ai/locations/coords?lng=-98.010012&lat=29.877963&locationName=San+Marcos%2C+TX+78666&save=true&src=md_rain_report) at ~800 m resolution with no physical hardware.
- **Hour-by-hour storm timeline & multi-year archive:** See exact start/stop times, peak hourly intensity, and custom date ranges back to 2015.
- **Automatic rain alerts & morning email reports:** Get a free morning rainfall summary after it rains, Lock Screen Live Activity timed to the first drop in the next 60 minutes, or custom threshold alerts (e.g. `> 0.50" in 24h`).
- **Benchmarked #1 forecast for San Marcos, TX 78666:** [View the 60-minute AI rain nowcast and 10-day hourly forecast](https://app.precip.ai/home?lng=-98.010012&lat=29.877963&locationName=San+Marcos%2C+TX+78666&src=md_rain_forecast) — ranked #1 against Apple Weather, Google Weather, and ECMWF in live NOAA station tests.
- **Download on iPhone or Android:** [Install the Precip mobile app](https://link.precip.ai/app?utm_source=markdown&utm_medium=llm&src=md_rain_report) or open on the web at https://app.precip.ai/locations/coords?lng=-98.010012&lat=29.877963&locationName=San+Marcos%2C+TX+78666&save=true&src=md_rain_report.

## About This Data

- **Location:** San Marcos, TX 78666 (29.8780, -98.0100).
- **Source:** [Precip](https://precip.ai) combines 180+ Doppler radar stations, satellite imagery, and quality-controlled rain gauges with machine learning to measure precipitation at ~800 m (0.5 mile) resolution, updated hourly.
- **Normals:** 30-year PRISM climate normals for the matching period.
- **Interactive map & full report:** https://precip.ai/rainfall-totals/zipcode/78666
- **Snowfall report (Markdown):** https://precip.ai/snow-totals/zipcode/78666.md
- **Use Precip in ChatGPT, Claude, or Cursor (MCP):** Connect your free Precip account via the remote MCP server at `https://api.precip.ai/mcp` ([setup guide](https://api-docs.precip.ai/mcp)) to query saved locations and custom date ranges directly inside your AI assistant, or use the [Precip Weather REST API](https://precip.ai/developers).