Aurora Forecast and Prediction for San Jose, California
Did you mean: San José, Provincia de San José, Costa Rica?
Kp: 1 | Bz: 8.4
Best Viewing Window: 5:18 AM – 6:48 AM PDT (1h 30m) · peak hours typically 11:13 PM – 3:13 AM
Best Viewing Window:
5:18 AM – 6:48 AM PDT Space Weather Now
Timing: Now · Signal Strength: High
Webcam
No aurora cams nearby. Center on nearest camera (1189 mi away).
Browse other webcams on Windy3-Day Forecast for San Jose, California
Oct 12
Too far south - the aurora stays out of view from San Jose even during a severe (Kp 9) storm.
Global: NOAA has issued a watch for this night (see below) - moderate planetary activity, aurora across the high-latitude zone.
CME Watch: G1 (Minor) · Kp 5 expected
Best time to look up: 5:00 AM–8:00 AM PDT
35% chance of elevated activity · Kp 4 during viewing window, up to Kp 5 depending on CME timing
Oct 13
Too far south - the aurora stays out of view from San Jose even during a severe (Kp 9) storm.
Global: Moderate planetary activity expected - aurora across the high-latitude zone, and lower with a good substorm.
Best time to look up: 8:00 PM–11:00 PM PDT
35% chance of elevated activity · Kp 4 during viewing window
Oct 14
Too far south - the aurora stays out of view from San Jose even during a severe (Kp 9) storm.
Global: Moderate planetary activity expected - aurora across the high-latitude zone, and lower with a good substorm.
Best time to look up: 8:00 PM–11:00 PM PDT
20% chance of elevated activity · Kp 3.33 during viewing window
Aurora Oval & Satellite & Sun
Interactive Aurora Globe
Satellite View
Sunspots
Current sunspot number: 93
Coronal Mass Ejections
Aurora Photography by Todd Salat
Original prints from Todd Salat's collection.
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Solar Wind & IMF (GSM)
- Bt
- 9.3 nT
- Bx
- 2.9 nT
- By
- -1.4 nT
- Bz
- 8.4 nT
- Clock Angle θ
- 65°
- Cone Angle φ
- 283.3°
- Speed
- 522 km/s
- Density
- 7.9 p/cc
IMF Detail (GSE) & Source
- Bx
- 2.9 nT
- By
- -5.5 nT
- Bz
- 6.6 nT
- θ Angle
- 45.8°
- φ Angle
- 299.2°
- Satellite
- SOLAR-1
- Data Quality
- Good
- Reading Time
- Oct 13, 5:11 AM PDT
Geomagnetic Indices
- Kp (now)
- 1
- Dst
- -9 nT
- HPI
- 10 GW
- Sunspot Number
- 93
Aurora Model
- Ovation Value
- 0
- Ovation Label
- None
- Model Data Time
- Oct 13, 5:59 AM PDT
- Ovation Data
- Live
Scores & Ratings
- Aurora Visibility
- 0 · Poor
- Aurora Visibility (w/ Moon)
- 0 · Poor
- Prediction Score
- 0 · Little to None
Sky & Location
- Cloud Cover
- 0% · Clear
- Clouds, Next Dark Window
- 0% · Clear · ×1.00
- Aurora Visibility Tonight
- 0 · Poor (Outlook Tonight 0 × cloud 1.00)
- Solar Elevation
- -23.8° · Dark Night
- Moon Phase
- Waxing Crescent
- Moon Illumination
- 5%
- Moon Altitude
- -57.9° · Below Horizon
- Latitude
- 37.33939
- Longitude
- -121.89496
- Geomagnetic Latitude
- 43.1°
- Horizon Threshold
- Never
- Overhead Threshold
- Never
Prediction Model Inputs
- Bz Persistence (60min)
- 4.3 nT
- Newell Coupling
- 24
- Latitude Gate
- 0.00 now · 0.00 tonight
- Dynamic Pressure
- 3.6 nPa
- Storm Watch (CME)
- ~0h · G1 (Minor)
- Watch Predicted Kp
- 5
Timing & Signal Strength
- Timing
- Now
- Signal Strength
- High
- L1 Delay
- ~48 min
- Magnetic Midnight
- 1:13 AM (peak hours 11:13 PM – 3:13 AM)
- Best Viewing Window
- 5:18 AM – 6:48 AM PDT (1h 30m)
3-Day Kp Forecast
| PDT | Oct 13 | Oct 14 | Oct 15 |
|---|---|---|---|
| 5:00 PM–8:00 PM | 4 | 3.67 | 2.67 |
| 8:00 PM–11:00 PM | 4.67 | 4 | 3.33 |
| 11:00 PM–2:00 AM | 5 | 2.67 | 3 |
| 2:00 AM–5:00 AM | 4.33 | 3.67 | 2.33 |
| 5:00 AM–8:00 AM | 4 | 3.67 | 1.67 |
| 8:00 AM–11:00 AM | 3.67 | 3.67 | 1 |
| 11:00 AM–2:00 PM | 3.33 | 3.33 | 1.33 |
| 2:00 PM–5:00 PM | 2.67 | 2.67 | 2.33 |
| Max | 5 | 4 | 3.33 |
| Ap Index | 28 | 20 | 10 |
Storm Probability
| Level | Oct 13 | Oct 14 | Oct 15 |
|---|---|---|---|
| Active | 35% | 35% | 20% |
| Minor storm | 35% | 25% | 5% |
| Moderate storm | 15% | 10% | 1% |
| Strong-Extreme storm | 5% | 1% | 1% |
Planetary K-index
Interplanetary Magnetic Field Bz9.4 nT now
Southward (negative) Bz favors aurora. Observed data only, no forecast product exists for Bz.
Total IMF Field Bt10 nT now
Total interplanetary magnetic field strength - the ceiling on how negative Bz can go. A rising Bt alongside a still-fluctuating Bz often leads a stronger southward turn. Observed data only, no forecast product exists for Bt.
Global Storm Trend15 global now
Global (hemisphere-wide, not this city) prediction score over the last 24 hours, logged every 5 minutes - may differ from the Prediction ring above, which is specific to this location and time of night. Red above 70, yellow 50-70, teal below 50 - same thresholds used everywhere else on this page. Dashed line is the overall trend.
Dst History-9 nT now
Kyoto Dst geomagnetic storm index over the last 24 hours. Negative = ring-current energy stored = an active storm, not just predicted. Red below −50nT, yellow −20 to −50nT, teal above −20nT.
Solar Wind Speed & Pressure
Each line is scaled independently to its own 24h range (different units) - watch the shape, not a shared axis. A rising speed line or a pressure spike can signal an incoming stream or shock before Bz/Dst move.
Nerd Mode: See what’s really driving the score. Live solar wind, Bz, Kp, Dst, CME timing, and more. Data comes from NOAA SWPC and the Kyoto WDC, with a few metrics calculated here from the raw data. Live data refreshes every minute; trend charts every five.
Aurora Forecasts for Nearby Cities
Checking conditions somewhere else tonight? These are the closest cities with their own northern lights prediction.
- Oakland 38 mi
- San Francisco 42 mi
- Stockton 54 mi
- Sacramento 89 mi
- Fresno 124 mi
- Reno 189 mi
- Bakersfield 210 mi
- Los Angeles 306 mi
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