Saratoga, California (West Valley College Area)

Current Weather Conditions, Maps, and Forecasts

Sunday December 21, 2025; 8:25PM

DISCLAIMER: This is a hobby page. As such, the reliability of this information is not guaranteed, or warrantied 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 0 - GOOD (Using 2024 US-EPA PM2.5 conversion) Air quality is considered satisfactory, and air pollution poses little or no risk.
Outside Temperature	59.0°F
Wind Chill	59.0°F
Heat Index	58.8°F
Dew Point	55.8°F
Humidity	89%
Barometer	30.001 inHg
Barometer Trend (3 hours)	0.011 inHg
Wind	0 mph
Rain Rate	0.00 in/h
Garage Temperature	64.4°F
UV Index	0.0
ET	0.00 in
Radiation	0 W/m²
Using 2024 US-EPA PM2.5 conversion
Latest PM2.5 [AQI]	0 μg/m³ [0]

Since Midnight

High Temperature Low Temperature	62.9°F at 12:47:21 59.0°F at 20:22:38
High Heat Index Low Wind Chill	63.0°F at 12:47:21 59.0°F at 20:22:38
High Humidity Low Humidity	93% at 01:48:04 81% at 16:20:10
High Dewpoint Low Dewpoint	59.3°F at 09:43:53 55.0°F at 17:41:11
High Barometer Low Barometer	30.038 inHg at 10:38:03 29.957 inHg at 15:57:03
Today's Rain	0.00 in
High Rain Rate	0.00 in/h at 00:00:04
High Wind	7 mph from 051° (NE) at 15:20:47
Average Wind	0 mph
RMS Wind	0 mph
Vector Average Speed Vector Average Direction	0 mph N/A
High Garage Temperature Low Garage Temperature	65.4°F at 15:06:01 63.9°F at 08:30:01
High UV Low UV	0.6 at 11:30:15 0.0 at 00:00:04
High ET Low ET	0.00 in at 11:00:00 0.00 in at 00:05:00
High Radiation Low Radiation	302 W/m² at 14:07:15 0 W/m² at 00:00:04

Rain Year (1-Oct start)

Rain Year Total

5.76 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
Sun, 21 Dec 2025 20:15:02 -0800 (PST)

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

Sunday
Night
Moderate rain certain, with patchy fog

Lo 53 °F
Precp 87%
Rain

Monday
Moderate rain certain, with patchy fog

Hi 59 °F
Precp 77%
Rain

Monday
Night
Light rain certain, with areas of fog

Lo 50 °F
Precp 55%
Rain

Tuesday
Moderate rain certain

Hi 59 °F
Precp 72%
Rain

Tuesday
Night
Moderate rain showers certain, with a slight chance of thunderstorms

Lo 48 °F
Precp 100%
Rain
Showers

Wednesday
Moderate rain certain

Hi 57 °F
Precp 86%
Rain

Wednesday
Night
Moderate rain certain

Lo 48 °F
Precp 97%
Rain

Christmas
Day
Moderate rain certain

Hi 55 °F
Precp 98%
Rain

Sunday Night	Moderate rain certain, with patchy fog, with a low of 53. Mostly cloudy in the evening, with full overcast conditions arriving, becoming cloudy after midnight. Expecting approximately 0.66 inches of rain. Chance of precipitation is 87%. Humidity 97% in the evening, rising to 100% after midnight. Winds are a moderate breeze, SSE-S at 7-16 mph, gusting to a strong breeze (small-craft advisory!), 16-30 mph. Sustained winds stronger in the evening.
Monday	Moderate rain certain, with patchy fog, with a high of 59. Cloudy through the day. Expecting approximately 0.3 inches of rain, mostly in the morning. Chance of precipitation will be 77%. Humidity 100% through the day. Winds will be a light breeze, SSE-S at 5-7 mph, gusting to a moderate breeze, 9-15 mph.
Monday Night	Light rain certain, with areas of fog, with a low of 50. Cloudy through the night. Expecting approximately 0.13 inches of rain, mostly in the evening. Chance of precipitation will be 55%. Humidity 100% through the night. Winds will be a light breeze, SSE-S at 3-5 mph, gusting to a gentle breeze, 7-10 mph.
Tuesday	Moderate rain certain, with a high of 59. Cloudy through the day. Expecting approximately 0.13 inches of rain, mostly in the afternoon. Chance of precipitation will be 72%. Humidity 100% in the morning, lowering to 89% by the afternoon. Winds will be a moderate breeze, SSE at 5-13 mph, gusting to a strong breeze (small-craft advisory!), 10-26 mph. Winds stronger in the afternoon.
Tuesday Night	Moderate rain showers certain, with a slight chance of thunderstorms, with a low of 48. Cloudy in the evening, with a bit of the cloudiness clearing, becoming mostly cloudy after midnight. Expecting approximately 0.62 inches of rain. Chance of precipitation will be 100%. Humidity 93% in the evening, rising to 96% after midnight. Winds will be a moderate breeze, SSE-SSW at 7-17 mph, gusting to a near gale (small-craft advisory!), 15-33 mph. Winds weaker in the evening.
Wednesday	Moderate rain certain, with a high of 57. Mostly cloudy through the day. Expecting approximately 0.42 inches of rain. Chance of precipitation will be 86%. Humidity 100% in the morning, lowering to 86% by the afternoon. Winds will be a gentle breeze, SSE-S at 7-12 mph, gusting to a fresh breeze, 15-24 mph.
Wednesday Night	Moderate rain certain, with a low of 48. Cloudy through the night. Chance of precipitation will be 97%. Humidity 83% in the evening, rising to 93% after midnight. Winds will be a moderate breeze, SSE-S at 10-17 mph, gusting to a strong breeze (small-craft advisory!), 22-31 mph.
Christmas Day	Moderate rain certain, with a high of 55. Cloudy through the day. Chance of precipitation will be 98%. Humidity 93% in the morning, rising to 100% by the afternoon. Winds will be a moderate breeze, S at 15-16 mph, gusting to a strong breeze (small-craft advisory!), 29-30 mph.
Thursday Night	Moderate rain certain, with patchy fog, with a low of 46. Cloudy through the night. Chance of precipitation will be 95%. Humidity 89% in the evening, rising to 92% after midnight. Winds will be a moderate breeze, S at 13 mph, gusting to a strong breeze (small-craft advisory!), 24-26 mph.
Friday	Light rain certain, with a high of 57. Mostly cloudy in the morning, with full overcast conditions arriving, becoming cloudy by the afternoon. Chance of precipitation will be 83%. Humidity 96% in the morning, rising to 100% by the afternoon. Winds will be a gentle breeze, S at 7-8 mph, gusting to a moderate breeze, 15-16 mph.
Friday Night	A chance of moderate rain, with patchy fog, with a low of 46. Mostly cloudy through the night. Chance of precipitation will be 62%. Humidity 93% in the evening, rising to 96% after midnight. Winds will be a light breeze, S at 6 mph, gusting to a moderate breeze, 10-14 mph.
Saturday	A chance of light rain, with areas of fog, with a high of 57. Mostly cloudy in the morning, with a bit of the overcast clearing, becoming partly cloudy by the afternoon. Chance of precipitation will be 34%. Humidity 100% through the day. Winds will be a light air, E-SE at 3 mph, gusting to a gentle breeze, 7-8 mph.
Saturday Night	A slight chance of light rain, with areas of fog, with a low of 41. Partly cloudy through the night. Chance of precipitation will be 24%. Humidity 83% in the evening, rising to 97% after midnight. Winds will be a light air, NNW-N at 3 mph, gusting to a light breeze, 6-7 mph.
Sunday	High of 59. Mostly sunny through the day. Chance of precipitation will be 15%. Humidity 96% in the morning, rising to 100% by the afternoon. Winds will be a light air, N-NE at 3 mph, gusting to a light breeze, 6 mph.

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: 2 days, 17 hours, 29 minutes
Server uptime: 2 days, 17 hours, 29 minutes
weewx v5.2.0

Sun
Start civil twilight:	06:48:28
Sunrise:	07:18:07
Transit:	12:06:21
Sunset:	16:54:36
End civil twilight:	17:24:15
Prev. Day Length:	09:36:29
Curr. Day Length:	09:36:29
Curr. Longer by:	00:00:00
Azimuth:	269.9°
Altitude:	-41.0°
Right ascension:	270.6°
Declination:	-23.4°
Equinox:	03/20/26 07:45:53
Solstice:	06/21/26 01:24:31

Moon
Rise:	08:55:34
Transit:	13:37:04
Set:	18:22:44
Duration Seen:	09:27
Azimuth:	254.2°
Altitude:	-22.1°
Right ascension:	295.9°
Declination:	-25.4°
Full moon:	01/03/26 02:02:50
New moon:	01/18/26 11:51:54
Phase:	Waxing crescent (4% 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.