Weather & Air History

PaloAltoWeather.com

Weather, Air Quality & Seismic Activity
Minor Coastal Flood Advisory In effect now · until Sun 6:00 PM See details →
Graphs Highs & Lows Monthly Yearly

Graphs past year

last 365 days

Pick a measureOct 30, 2026

Air qualityAQI against the EPA categories

24 Good
GoodModerateSensitive050100150NovFebMayAug

High 130 Dec 6, 2025Low 0 Nov 13, 2025

Air quality indexEPA categories

The year at a glancelast 365 days

TEMPERATURE & DEW POINT °F0.025.050.075.0100.0125.0high 100.2°F Jun 11, 2026low 31.5°F Jan 10, 2026HUMIDITY050100WIND mph & DIRECTION0102030RAIN in (daily totals)0.002.00BAROMETER inHg29.00030.00031.000SOLAR W/m² (pale = clear-sky maximum)0200400AIR QUALITY INDEX0100200CARBON DIOXIDE ppm2505007501000NovDecJanFebMarAprMayJunJulAugSepOct

High 100.2°F Jun 11, 2026Low 31.5°F Jan 10, 2026

TemperatureDew point

Drag across the frame to read every panel at the same moment.

Humiditywith dew point

75%
0.020.040.060.080.0dew °F050100NovDecJanFebMarAprMayJunJulAugSepOct

High 97% Nov 21, 2025Low 15% Mar 28, 2026

HumidityDew point, right scale

Windspeed and gusts; arrows fly the way the wind is blowing

1 mph N
0102030NovDecJanFebMarAprMayJunJulAugSepOct

Peak gust 27 mph Dec 25, 2025Now from N

WindGustArrows fly with the wind

Rain7-day totals

14.05 in
0.001.002.003.00NovDecJanFebMarAprMayJunJulAugSepOct

Total 14.05 inWettest 2.59 in Feb 12–18, 2026

Barometerlast 365 days

29.858 inHg
29.00029.50030.00030.50031.000NovDecJanFebMarAprMayJunJulAugSepOct

High 30.526 inHg Jan 10, 2026Low 29.481 inHg Dec 24, 2025

Sunagainst the clear-sky maximum, the pale curve

149 W/m²
0.05.010.015.0UV0200400NovDecJanFebMarAprMayJunJulAugSepOct

Peak 1507 W/m² May 25, 2026Peak UV 12.1 Jul 20, 2026Share of a clear sky 97%

MeasuredClear-sky maximumUV, right scale

Air qualityAQI against the EPA categories

24 Good
GoodModerateSensitive050100150NovDecJanFebMarAprMayJunJulAugSepOct

High 130 Dec 6, 2025Low 0 Nov 13, 2025

Air quality indexEPA categories

Carbon dioxidelast 365 days

448 ppm
2004006008001000NovDecJanFebMarAprMayJunJulAugSepOct

High 861 ppm Jan 13, 2026Low 363 ppm Jul 8, 2026

Carbon dioxideOutdoor background, 425 ppm

Stationsignal and console battery

99%
0%50%100%3.63.84.04.2NovDecJanFebMarAprMayJunJulAugSepOct

Signal now 99%Battery 3.9 V

SignalBattery, right scale

Go to Top