Santa Clara County Weather Forecast
Santa Clara County weather: 57°F, clear. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
14-day forecast for Santa Clara County
Daily highs and lows, precipitation and UV.
| Day | Conditions | High / Low | Precip | Wind | UV |
|---|---|---|---|---|---|
| Wed, Sep 16 | ☀️ Clear sky | 73° / 54° | 0% | 13 mph | 7 |
| Thu, Sep 17 | ☁️ Overcast | 73° / 54° | 0% | 11 mph | 7 |
| Fri, Sep 18 | ☀️ Clear sky | 85° / 60° | 1% | 11 mph | 7 |
| Sat, Sep 19 | ☁️ Overcast | 85° / 61° | 0% | 11 mph | 7 |
| Sun, Sep 20 | ☁️ Overcast | 78° / 60° | 2% | 10 mph | 6 |
| Mon, Sep 21 | ☀️ Clear sky | 85° / 58° | 2% | 9 mph | 6 |
| Tue, Sep 22 | ☀️ Clear sky | 94° / 65° | 0% | 8 mph | 6 |
| Wed, Sep 23 | ☁️ Overcast | 98° / 70° | 2% | 9 mph | 6 |
| Thu, Sep 24 | ☁️ Overcast | 91° / 71° | 1% | 7 mph | 6 |
| Fri, Sep 25 | 🌦️ Light drizzle | 87° / 69° | 2% · 0,0 in | 11 mph | 6 |
| Sat, Sep 26 | 🌦️ Drizzle | 81° / 62° | 3% · 0,1 in | 10 mph | 6 |
| Sun, Sep 27 | ⛅ Partly cloudy | 82° / 62° | 6% | 11 mph | 6 |
| Mon, Sep 28 | ☁️ Overcast | 79° / 58° | 0% | 10 mph | 6 |
| Tue, Sep 29 | ⛅ Partly cloudy | 79° / 56° | 0% | 11 mph | 6 |
The two-week trend
Warming. The second half of the window averages 35°F warmer than the days immediately ahead.
The window averages 83°F against a September normal of 83°F - right on average.
The next 7 days look unusually dry - roughly 0% of a normal September week (0,0 in against 0,0 in).
What this means for Santa Clara County
Today is cooler than average for September. The forecast high of 73°F is 9.9°F below the 83°F typical for this month.
Rain is very unlikely today - plans do not need a backup.
No weather-related travel disruption is expected today. Roads and airports should run normally.
Northern Hemisphere, so peak summer falls in June to August.
The gap between the warmest and coldest month averages 51°F.
What to pack, what to skip
- Lightweight, light-coloured clothing and a refillable water bottle
- Sunglasses, a brimmed hat and SPF 30+
- If your dates are flexible, avoid January, February and December - historically the least comfortable months here.
See the Santa Clara County forecast by time range
Santa Clara County weather - more answers
Explore Santa Clara County
Every topic we hold for this place, and the same topic for the places around it.
Weather for related places
Frequently asked questions
Where is Santa Clara County?
Santa Clara County is a county in California. Its coordinates are 37.3541, -121.9552. It lies in North America.
What is the weather like in Santa Clara County right now?
It is currently 57°F (14°C) with clear. Humidity is 86% and wind is 3 mph.
When is the best time to visit Santa Clara County?
May, June, July, August, September and October offer the most comfortable conditions in Santa Clara County, which has a Mediterranean climate. January, February and December are usually the hardest months for outdoor plans.
What time zone is Santa Clara County in?
Santa Clara County observes America/Los_Angeles (UTC-07:00). The local time is 4:09 PM.
How many people live in Santa Clara County?
Santa Clara County has a population of approximately 1.9 million.
What is the nearest airport to Santa Clara County?
The closest airports are San Francisco International Airport (SFO), 30 mi away and Los Angeles International Airport (LAX), 309 mi away.
What are the top things to do in Santa Clara County?
Popular options include Alcatraz Island, Golden Gate Bridge, Point Lobos State Natural Reserve, Pinnacles National Park, Julia Pfeiffer Burns State Park and Half Dome.
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| Place data | USPOTUS Atlas dataset (us-counties) - coordinates, hierarchy and facts. |
|---|---|
| Forecast and observations | Open-Meteo (ECMWF and national models). |
| Air quality and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climate averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Weather Service. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated September 17, 2026 at 4:09 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
