Magnetic storms in San Francisco
Magnetic storms in San Francisco, California today. Current Kp index, 3-day forecast for San Francisco, local time, geomagnetic latitude and aurora visibility chance.
Data as of 12 Jun, 00:14 (America/Los_Angeles).
Weather in San Francisco
Weather data: Open-Meteo (CC BY).
Health and geomagnetic storms
A small library on how geomagnetic activity is associated with blood pressure, migraine, sleep, the cardiovascular system, anxiety and general wellbeing. Backed by peer-reviewed research, free of medical advice.
Weather sensitivity
What weather sensitivity is, how it differs from a reaction to magnetic storms, and how to help yourself.
HealthMigraine and geomagnetic storms
Links between Kp index and migraine attacks, triggers, prevention, what researchers recommend.
HealthPregnancy and geomagnetic storms
How geomagnetic disturbances may affect pregnant women, what current data shows, and what to watch for on storm days.
Health
Local context
Sensitivity · San Francisco
Low sensitivity (low latitudes)
Kp is a planetary index — the same globally. Local impact depends on geomagnetic latitude: the higher it is, the more noticeable the storm.
14-day calendar with Kp, moon and cloud factors
Seven quick questions and personal tips
Geomagnetic context for San Francisco
Magnetic storm in San Francisco: 3-day Kp chart
Aurora forecast in San Francisco
| Date | Max Kp | Moon | Clouds | Score | Outlook |
|---|---|---|---|---|---|
| Thu, Jun 11 | — | 19% | 4% | — | Kp forecast is not yet available for this date. |
| Fri, Jun 12 | 4.7 | 12% | 35% | 0 | Auroras are very unlikely tonight. |
| Sat, Jun 13 | 5.7 | 6% | 47% | 0 | Auroras are very unlikely tonight. |
| Sun, Jun 14 | 4.7 | 2% | 0% | 0 | Auroras are very unlikely tonight. |
| Mon, Jun 15 | 2.0 | 0% | 0% | 0 | Auroras are very unlikely tonight. |
| Tue, Jun 16 | 3.0* | 1% | 0% | 0 | Auroras are very unlikely tonight. |
| Wed, Jun 17 | 3.0* | 3% | 4% | 0 | Auroras are very unlikely tonight. |
| Thu, Jun 18 | 3.0* | 8% | 44% | 0 | Auroras are very unlikely tonight. |
| Fri, Jun 19 | 3.0* | 15% | 70% | 0 | Auroras are very unlikely tonight. |
| Sat, Jun 20 | 3.0* | 23% | 73% | 0 | Auroras are very unlikely tonight. |
| Sun, Jun 21 | 3.0* | 33% | 99% | 0 | Auroras are very unlikely tonight. |
| Mon, Jun 22 | 3.0* | 43% | 44% | 0 | Auroras are very unlikely tonight. |
| Tue, Jun 23 | 3.0* | 54% | 37% | 0 | Auroras are very unlikely tonight. |
| Wed, Jun 24 | 3.0* | 64% | 68% | 0 | Auroras are very unlikely tonight. |
| Thu, Jun 25 | 3.0* | 74% | — | 0 | Auroras are very unlikely tonight. |
- Thu, Jun 11no dataMax Kp: —Moon: 19%Clouds: 4%Kp forecast is not yet available for this date.
- Fri, Jun 120Max Kp: 4.7Moon: 12%Clouds: 35%Auroras are very unlikely tonight.
- Sat, Jun 130Max Kp: 5.7Moon: 6%Clouds: 47%Auroras are very unlikely tonight.
- Sun, Jun 140Max Kp: 4.7Moon: 2%Clouds: 0%Auroras are very unlikely tonight.
- Mon, Jun 150Max Kp: 2.0Moon: 0%Clouds: 0%Auroras are very unlikely tonight.
- Tue, Jun 160Max Kp: 3.0*Moon: 1%Clouds: 0%Auroras are very unlikely tonight.
- Wed, Jun 170Max Kp: 3.0*Moon: 3%Clouds: 4%Auroras are very unlikely tonight.
- Thu, Jun 180Max Kp: 3.0*Moon: 8%Clouds: 44%Auroras are very unlikely tonight.
- Fri, Jun 190Max Kp: 3.0*Moon: 15%Clouds: 70%Auroras are very unlikely tonight.
- Sat, Jun 200Max Kp: 3.0*Moon: 23%Clouds: 73%Auroras are very unlikely tonight.
- Sun, Jun 210Max Kp: 3.0*Moon: 33%Clouds: 99%Auroras are very unlikely tonight.
- Mon, Jun 220Max Kp: 3.0*Moon: 43%Clouds: 44%Auroras are very unlikely tonight.
- Tue, Jun 230Max Kp: 3.0*Moon: 54%Clouds: 37%Auroras are very unlikely tonight.
- Wed, Jun 240Max Kp: 3.0*Moon: 64%Clouds: 68%Auroras are very unlikely tonight.
- Thu, Jun 250Max Kp: 3.0*Moon: 74%Clouds: —Auroras are very unlikely tonight.
* Days marked with an asterisk do not have a direct NOAA forecast yet. If we have observations from 27 days ago, we use Bartels recurrence (the Sun rotates roughly every 27 days, so active regions often return with the same period). When no history is available, we substitute a baseline value typical for the current solar cycle 25 peak (Kp 3.0). Accuracy is lower than the direct three-day forecast.
How the score works
The composite score combines three signals: how strong the storm needs to be at your geomagnetic latitude, how bright the moon will be (a full moon hides faint auroras), and how cloudy the sky will be that night. A score of 70 or higher is excellent, 45 to 70 is good, below 20 means you probably will not see anything.
Magnetic storms in San Francisco over the last 30 days
Geomagnetic storms of class G1 and above recorded over the past month. Times are shown in the city's local timezone (PDT).
In San Francisco (geomagnetic latitude 43.4°), auroras are extremely rare even during strong storms.
| Date | Peak | Max Kp | Level | Duration | Aurora visible |
|---|---|---|---|---|---|
| 11:00 | 5.0 | G1 | 3 h | No | |
| 08:00 | 6.3 | G2 | 12 h | No |
Nearby cities
About magnetic storms in San Francisco
Magnetic storm in San Francisco today: planetary Kp = 3.3 (quiet). Over the last 7 days the maximum Kp above San Francisco reached 6.3 (G2); storm days (G1+) this week: 2.
San Francisco sits at geomagnetic latitude 43.4°. The nearest magnetic observatory continuously recording the field is Paratunka (Kamchatka), 6088 km away. Population 827,526.
San Francisco sits at low latitudes (43.4°), where geomagnetic storms have very limited impact on health. Scientific links between Kp and well-being are weak this far from the auroral oval, and only the strongest Carrington-class events would be expected to affect sensitive groups. Standard healthy habits, good sleep, hydration and moderate activity, remain the most reliable advice.
Technical systems in San Francisco (43.4°, low latitudes) are well shielded from geomagnetic disturbances. Even extreme storms rarely cause meaningful GPS, radio or power-grid problems at this latitude, so routine activity, navigation and communications can be considered safe. For reference and historical events, data come from the NOAA Space Weather Prediction Center, updated every 10 minutes.
Over San Francisco during the last 24 hours. Kp reached a maximum of 5.0 around 11:00 local time and dipped to 2.3. The planetary trend over the past 6 hours is falling — the magnetosphere near San Francisco is in the recovery phase. So far this month the planet has logged 2 days with a G1 or stronger geomagnetic storm.
Aurora visibility threshold for San Francisco. At a geomagnetic latitude of 43.4°, the minimum Kp giving a realistic chance of visible auroras above San Francisco is about Kp ≥ 8. The current equatorial Dst index is 0 nT — the magnetosphere is in a quiet phase. Dst complements Kp by showing how long and how deep a storm's main phase has been — useful context when checking whether auroras are likely tonight.
Weather and atmospheric pressure in San Francisco right now. Temperature +14°C, atmospheric pressure 755.9 mm Hg (1007.8 hPa), cloud cover 38%, humidity 93%, wind 19.7 km/h. During G1+ geomagnetic storms, swings in atmospheric pressure tend to amplify symptoms for weather-sensitive people: those with hypertension often notice blood-pressure spikes, and readings below 1000 hPa combined with Kp ≥ 5 frequently bring headaches and fatigue. That is why the San Francisco page shows both indicators side by side. Weather data from Open-Meteo (CC BY).
Aurora viewing window for San Francisco tonight. Sunset is at 10:31 local time, sunrise tomorrow at 19:47. Moon phase — waning crescent with 10% disk illumination. Conditions are average — watch the cloud forecast and find a spot well away from city lights..