Can you see the Milky Way from San Jose?

Not from San Jose itself — at about Bortle 8 the dome is too bright. The darkest edge of the same metro is Hillsborough, about 31 mi out at roughly Bortle 5.

How dark is the sky across the San Jose metro?

It varies by how close you are to the core. San Jose itself reads about Bortle 8; the 46 towns in this light dome range down to Hillsborough at roughly Bortle 5, about 31 mi from the core. The table above sorts every town in the metro by measured darkness.

Where's the nearest certified dark-sky destination to San Jose?

None of the 92 certified International Dark Sky Places sit within about 250 miles of San Jose — the nearest genuinely darker option is Hillsborough within the metro itself.

San Jose, CA — light pollution & stargazing across the metro

California · Very poor — city glow · 46 towns · 3,506,973 people in this light dome

The San Jose, CA light dome covers 46 towns and about 3,506,973 people rated together, reading roughly Bortle 8 — a city sky (very poor — city glow) — at San Jose itself, measured from VIIRS 2024 satellite night-lights. The darkest edge of this same dome is Hillsborough, about 31 mi out, at roughly Bortle 5. Tonight's Moon phase, cloud cover, and aurora odds load live below, computed in your browser.

1–2 3 4 5 6 7 8 9

← darker sky You: Bortle 8 · City sky brighter →

Stargazing at the San Jose core tonight

Light-pollution reading — dome core San Jose, CA · VIIRS 2024

Estimated Bortle class (core): 8 of 9
VIIRS radiance (core): 97 nW/cm²/sr
Naked-eye limiting mag. (core): 4.1–4.5
Darkest edge of this dome: Hillsborough · B5 · 31 mi

What you can see from the San Jose core

The sky is bright enough to read by. Only the Moon, the planets, and the few brightest stars and clusters are visible — the constellations lose most of their fainter stars.

At an estimated Bortle 8, the faintest stars visible from San Jose itself on a clear, moonless night run to about magnitude 4.1–4.5, and the Milky Way is not visible. Hillsborough is a regional drive away (31 mi) and improves to roughly Bortle 5.

Of the 46 towns rated in this dome, most read Bortle 7 (25 towns) — spread across 4 darkness classes overall. Beyond San Jose itself, Fremont, Hayward, Sunnyvale round out the largest towns sharing this same light dome.

The sky from 37.3°N

Declination above +52.7° never sets here, and below −52.7° never rises — no matter how clear the night or how long you wait.

Never sets: Polaris, the Big Dipper
Never rises: Canopus, Alpha Centauri, the Southern Cross
Milky Way core: culminates 23.7° above the southern horizon — it climbs to a workable height in the south on summer nights.
Longest night: 14 h 35 m at the December solstice, 9 h 25 m in June.
Midsummer: the Sun reaches only 29.2° below the horizon at solar midnight in June — past the 18° astronomical-night mark.

Geometric, from 37.339°N, 121.895°W. How these are computed.

Every town in this light dome, darkest first

All 46 towns inside San Jose's ~35-mile dome, each with its own measured reading.

San Jose metro towns, darkest sky first.
Town	State	Bortle	Sky	Radiance
Hillsborough	CA	5	Suburban sky	4.7
Saratoga	CA	5	Suburban sky	7.2
Fairview	CA	5	Suburban sky	7.8
Half Moon Bay	CA	6	Bright suburban sky	9.3
Scotts Valley	CA	6	Bright suburban sky	10
Burlingame	CA	6	Bright suburban sky	12
Capitola	CA	6	Bright suburban sky	12
Palo Alto	CA	6	Bright suburban sky	13
San Lorenzo	CA	6	Bright suburban sky	14
Los Altos	CA	6	Bright suburban sky	14
Live Oak	CA	6	Bright suburban sky	16
Danville	CA	6	Bright suburban sky	19
Los Gatos	CA	7	Suburban / urban transition	20
Mountain View	CA	7	Suburban / urban transition	22
Cherryland	CA	7	Suburban / urban transition	26
San Carlos	CA	7	Suburban / urban transition	27
Menlo Park	CA	7	Suburban / urban transition	28
Pleasanton	CA	7	Suburban / urban transition	28
Redwood City	CA	7	Suburban / urban transition	29
Stanford	CA	7	Suburban / urban transition	30
Belmont	CA	7	Suburban / urban transition	30
San Ramon	CA	7	Suburban / urban transition	30
Santa Cruz	CA	7	Suburban / urban transition	30
Morgan Hill	CA	7	Suburban / urban transition	31
Campbell	CA	7	Suburban / urban transition	32
Dublin	CA	7	Suburban / urban transition	32
Newark	CA	7	Suburban / urban transition	32
Union City	CA	7	Suburban / urban transition	32
Ashland	CA	7	Suburban / urban transition	33
San Mateo	CA	7	Suburban / urban transition	34
Santa Clara	CA	7	Suburban / urban transition	36
East Palo Alto	CA	7	Suburban / urban transition	36
Sunnyvale	CA	7	Suburban / urban transition	36
Castro Valley	CA	7	Suburban / urban transition	36
Livermore	CA	7	Suburban / urban transition	37
Cupertino	CA	7	Suburban / urban transition	37
Foster City	CA	7	Suburban / urban transition	40
Fremont	CA	8	City sky	43
Gilroy	CA	8	City sky	45
Millbrae	CA	8	City sky	46
Watsonville	CA	8	City sky	48
San Leandro	CA	8	City sky	49
San Bruno	CA	8	City sky	49
Hayward	CA	8	City sky	50
Milpitas	CA	8	City sky	82
San Jose	CA	8	City sky	97

Certified dark-sky destinations near San Jose

None of the 92 certified International Dark Sky Places sit within about 250 miles of San Jose. The darkest option inside this same metro is Hillsborough, about 31 mi out.

Other light domes near San Jose

San Francisco, CA (42 mi, core Bortle 8) , Sacramento, CA (89 mi, core Bortle 9) , and Los Angeles, CA (305 mi, core Bortle 9) are the closest other metro-scale domes tracked here — each with its own core reading and its own darkest edge.

Frequently asked questions

Can you see the Milky Way from San Jose?: Not from San Jose itself — at about Bortle 8 the dome is too bright. The darkest edge of the same metro is Hillsborough, about 31 mi out at roughly Bortle 5.
How dark is the sky across the San Jose metro?: It varies by how close you are to the core. San Jose itself reads about Bortle 8; the 46 towns in this light dome range down to Hillsborough at roughly Bortle 5, about 31 mi from the core. The table above sorts every town in the metro by measured darkness.
Where's the nearest certified dark-sky destination to San Jose?: None of the 92 certified International Dark Sky Places sit within about 250 miles of San Jose — the nearest genuinely darker option is Hillsborough within the metro itself.

How to read this rating

A satellite proxy, not a survey-grade reading. Sources and limits.

More in California

All California towns · Bortle scale · Tonight's Moon · Dark-sky map