Saratoga, California (West Valley College Area)

Current Weather Conditions, Maps, and Forecasts

Thursday September 18, 2025; 1:35AM

DISCLAIMER: This is a hobby page. As such, the reliability of this information is not guaranteed, or warranted in any way, including, but not limited to, either for correctness or for fitness for any particular purpose. All risk for the use of this information is assumed by the readers and users of this page, including those who use the results extracted from either this page, or the scripts on which this page relies. Never base decisions that could affect life, property, livelihood, or anything else, on the information contained on this page, whether this information is locally derived or extracted from other locations on the Internet. In particular, the outputs and results shown for the air quality index (AQI) and the text forecasts are entirely the experimental work of an amateur hobbyist with no training in either weather forecasting or meterology. As such, these pages could very well contain or convey completely incorrect information (for example, the AQI reading is based on the last measurement of pollutants only, and is not an average over multiple hours!)

Current Conditions

Realtime Single-sample US-EPA Air Quality Index 7 - GOOD (Using 2024 US-EPA PM2.5 conversion) Air quality is considered satisfactory, and air pollution poses little or no risk.
Outside Temperature	66.3°F
Wind Chill	66.3°F
Heat Index	65.9°F
Dew Point	55.8°F
Humidity	69%
Barometer	29.803 inHg
Barometer Trend (3 hours)	-0.043 inHg
Wind	0 mph
Rain Rate	0.00 in/h
Garage Temperature	81.5°F
UV Index	0.0
Radiation	0 W/m²
Using 2024 US-EPA PM2.5 conversion
Latest PM2.5 [AQI]	1.271 μg/m³ [7]

Since Midnight

High Temperature Low Temperature	68.7°F at 00:09:02 66.3°F at 01:34:26
High Heat Index Low Wind Chill	68.5°F at 00:09:02 66.3°F at 01:34:26
High Humidity Low Humidity	72% at 01:01:04 69% at 00:07:16
High Dewpoint Low Dewpoint	58.4°F at 00:00:04 55.8°F at 01:34:26
High Barometer Low Barometer	29.838 inHg at 00:00:04 29.803 inHg at 01:34:02
Today's Rain	0.00 in
High Rain Rate	0.00 in/h at 00:00:04
High Wind	0 mph
Average Wind	0 mph
RMS Wind	0 mph
Vector Average Speed Vector Average Direction	0 mph N/A
High Garage Temperature Low Garage Temperature	82.7°F at 00:00:04 81.3°F at 01:35:00
High UV Low UV	0.0 at 00:00:04 0.0 at 00:00:04
High Radiation Low Radiation	0 W/m² at 00:00:04 0 W/m² at 00:00:04
Using 2024 US-EPA PM2.5 conversion
High PM2.5 [AQI] Low PM2.5 [AQI]	1.2744 μg/m³ [7] at 00:51:17 0.8028 μg/m³ [4] at 00:46:17

Rain Year (1-Oct start)

Rain Year Total

18.20 in

Local Radar Loop

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Regional Radar Loop

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Hazard Map (from the NWS)

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Current Weather Outlook

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Low Temperature Outlook

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High Temperature Outlook

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Santa Clara County Reservoirs

ALERT Reservoir Data

California Major Reservoirs

Major Reservoir Levels

PG&E Electrical Outage Map

California Rainfall Totals

NOAA/NWS CA/NV Rainfall totals

California Snowpack Levels

California Snowpack Information

CAL FIRE Incidents

CAL Fire Active Incidents

Weather Networks We Are On

Weather Forecast

Forecast Created by Experimental Software Written By an Amateur With No Guarantee or Warranty or Promise of Accuracy Provided or Implied! Use at Your Own Risk! You Assume All Risk and Liability If You Use This Information in Any Way, For Any Purpose Whatsoever! See the Disclaimer Given Above!

raw forecast data generated on
Thu, 18 Sep 2025 00:40:02 -0700 (PDT)

Click here for an official National Weather Service forecast! NWS Disclaimer

Wednesday
Night
Mostly Cloudy

Lo 62 °F
Precp 7%
Mostly
Cloudy

Thursday
A chance of light rain showers, with isolated thunderstorms

Hi 84 °F
Precp 23%
Chance
Rain
Showers

Thursday
Night
A chance of light rain showers, with isolated thunderstorms

Lo 62 °F
Precp 37%
Chance
Rain
Showers

Friday
A chance of light rain showers

Hi 82 °F
Precp 31%
Chance
Rain
Showers

Friday
Night
Partly Cloudy

Lo 60 °F
Precp 12%
Partly
Cloudy

Saturday
Mostly Sunny

Hi 84 °F
Precp 13%
Mostly
Sunny

Saturday
Night
Mostly Clear

Lo 59 °F
Precp 5%
Mostly
Clear

Sunday
Sunny

Hi 87 °F
Precp 3%
Sunny

Wednesday Night	Low of 62. Partly cloudy through the night. Chance of precipitation is 7%. Humidity 61% in the evening, rising to 72% after midnight. Winds are a light air, SE-W at 1-2 mph, gusting to a light breeze, 3-5 mph.
Thursday	A chance of light rain showers, with isolated thunderstorms, with a high of 84. Mostly cloudy through the day. Chance of precipitation will be 23%. Humidity 72% in the morning, lowering to 56% by the afternoon. Winds will be a light breeze, NW-ENE at 2-6 mph, gusting to a moderate breeze, 5-14 mph. Winds stronger in the afternoon.
Thursday Night	A chance of light rain showers, with isolated thunderstorms, with a low of 62. Mostly cloudy through the night. Expecting approximately 0.12 inches of rain. Chance of precipitation will be 37%. Humidity 60% in the evening, rising to 90% after midnight. Winds will be a light air, N-SSE at 1-3 mph, gusting to a light breeze, 1-6 mph. Sustained winds stronger in the evening.
Friday	A chance of light rain showers, with a high of 82. Mostly cloudy in the morning, with a bit of the overcast clearing, becoming partly cloudy by the afternoon. Expecting approximately 0.03 inches of rain, mostly in the morning. Chance of precipitation will be 31%. Humidity 90% in the morning, lowering to 58% by the afternoon. Winds will be a light breeze, SSE-WSW at 1-5 mph, gusting to a gentle breeze, 3-10 mph. Winds stronger in the afternoon.
Friday Night	Low of 60. Mostly clear in the evening, with incoming clouds making it partly cloudy after midnight. Chance of precipitation will be 12%. Humidity 60% in the evening, rising to 86% after midnight. Winds will be a light breeze, W at 1-6 mph, gusting to a gentle breeze, 2-9 mph. Winds weaker in the evening.
Saturday	High of 84. Partly cloudy in the morning, with some clouds clearing, making it mostly sunny by the afternoon. Chance of precipitation will be 13%. Humidity 90% in the morning, lowering to 57% by the afternoon. Winds will be a light breeze, WNW-NW at 1-6 mph, gusting to a gentle breeze, 2-12 mph. Winds stronger in the afternoon.
Saturday Night	Low of 59. Clear in the evening, with a few clouds later making it mostly clear after midnight. Chance of precipitation will be 5%. Humidity 56% in the evening, rising to 84% after midnight. Winds will be a light breeze, NW-NNW at 2-6 mph, gusting to a moderate breeze, 3-13 mph. Winds weaker in the evening.
Sunday	High of 87. Mostly sunny in the morning, with any clouds clearing to become sunny by the afternoon. Chance of precipitation will be 3%. Humidity 86% in the morning, lowering to 60% by the afternoon. Winds will be a light air, NW-NNW at 1-2 mph, gusting to a light breeze, 2-6 mph. Winds stronger in the afternoon.
Sunday Night	Low of 62. Mostly clear through the night. Chance of precipitation will be 1%. Humidity 46% in the evening, rising to 75% after midnight. Winds will be a light breeze, NW at 1-6 mph, gusting to a gentle breeze, 2-12 mph. Winds weaker in the evening.
Monday	High of 93. Mostly sunny through the day. Chance of precipitation will be 6%. Humidity 77% in the morning, lowering to 51% by the afternoon. Winds will be a light air, NW at 1-2 mph, gusting to a light breeze, 2-5 mph. Winds stronger in the afternoon.
Monday Night	Low of 64. Mostly clear in the evening, with incoming clouds making it partly cloudy after midnight. Chance of precipitation will be 18%. Humidity 40% in the evening, rising to 73% after midnight. Winds will be a light breeze, W-NW at 2-6 mph, gusting to a gentle breeze, 3-12 mph. Winds weaker in the evening.
Tuesday	A chance of light rain showers, with a high of 82. Partly cloudy through the day. Chance of precipitation will be 31%. Humidity 81% in the morning, lowering to 64% by the afternoon. Winds will be a light air, WSW-WNW at 2-3 mph, gusting to a light breeze, 3-6 mph.
Tuesday Night	Low of 60. Partly cloudy through the night. Chance of precipitation will be 16%. Humidity 61% in the evening, rising to 84% after midnight. Winds will be a light breeze, W at 2-6 mph, gusting to a gentle breeze, 5-12 mph. Winds weaker in the evening.
Wednesday	High of 82. Partly cloudy in the morning, with some clouds clearing, making it mostly sunny by the afternoon. Chance of precipitation will be 6%. Humidity 90% in the morning, lowering to 66% by the afternoon. Winds will be a light air, WSW-WNW at 2-3 mph, gusting to a gentle breeze, 3-8 mph. Gusting winds stronger in the afternoon.

The above Experimental Forecast used the National Weather Service's NDFD XML Feed
for Saratoga, CA
(37.263°N, 122.003°W, NWS Zone CAZ513, NWS County CAC085)

Location
Latitude:	37° 15.75' N
Longitude:	122° 00.20' W
Altitude:	376 feet

This station uses a Vantage Pro2, controlled by 'WeeWX', an experimental weather software system written in Python. Weewx was designed to be simple, fast, and easy to understand by leveraging modern software concepts.

RSS feed

Smartphone formatted

WeeWX uptime: 0 days, 23 hours, 15 minutes
Server uptime: 0 days, 23 hours, 15 minutes
weewx v5.1.0

Sun
Start civil twilight:	06:26:05
Sunrise:	06:52:41
Transit:	13:01:56
Sunset:	19:10:35
End civil twilight:	19:37:08
Prev. Day Length:	12:20:16
Curr. Day Length:	12:17:54
Curr. Shorter by:	00:02:22
Azimuth:	12.9°
Altitude:	-50.3°
Right ascension:	176.0°
Declination:	1.7°
Equinox:	09/22/25 11:19:17
Solstice:	12/21/25 07:02:51

Moon
Rise:	03:36:07
Transit:	10:49:26
Set:	17:51:39
Duration Seen:	14:16
Azimuth:	45.8°
Altitude:	-19.9°
Right ascension:	138.9°
Declination:	18.4°
New moon:	09/21/25 12:54:03
Full moon:	10/06/25 20:47:33
Phase:	Waning crescent (12% full)

Monthly summary:
Yearly summary:

This system is powered by the open source WeeWX package, authored by Tom Keffer.

This system uses the open source Purple Air extensions to WeeWX package by Kenneth Baker to obtain the raw air pollutant values.

Thanks to JaneAndJohn.org for PHP-based RSS weather-feed code used in a prior iteration of this site.

Thanks to Ken True at Saratoga-Weather.org for pointers to good warning scripts, used in a prior iteration, and for being a great overall resource for scripting weather websites. Also, the idea to ignore certificate errors from the NOAA/NWS website comes from these scripts.

Thanks to Ken True at Saratoga-Weather.org and Mike Chaliss for their alerts script from which we leverage the array mapping alert event name to alert event background color, and a clever way to handle events that aren't in that mapping.

Thanks to Tom at carterlake.org for a script that caused me to want to learn how to obtain the raw data of a National Weather Service forecast, that triggered my building my own set of scripts. He has also created another great overall resource for scripting weather websites.

The raw data on which the forecasts are built, and the icons for these, come from the National Weather Service.

This system utilizes the xmlize utility written by Hans Anderson.

The URL used to get the alerts, and the idea to use cURL to get them (and any other needed JSON/XML data), comes from the "NWS Alerts" PHP package by Rick "Curly" at the WXForum web site.

The idea to use and how to properly invoke the xmlize library to extract information from the NWS comes from PXWeather by Jonathan M. Abbett.

The algorithms used to either adjust the Purpleair sensor PM2.5 pollutant concentrations or to convert from PM2.5 pollutant concentrations to an AQI value come from multiple sources.

If you want a copy of the current code that produces this generated-forecast information, and performs AQI calculations, as well as more open source license information for this package and the ones that it uses or has learned from, click here.

If you want to see the clumsy way I integrate WeeWX and PHP, click here.