Medical Hot Spring is a hot spring in Union County, Oregon at about 1,059 m (3,474 ft) above sea level. The nearest town is Union, about 28 km (18 mi) away (Medical Hot Spring lies SE of town).
Sunrise & sunset directions
At Medical Hot Spring the sunrise point swings a long way through the year: about 55° (NE) at the June solstice and 123° (ESE) in late December. Sunset moves from 305° (NW) in June to 237° (WSW) in December, and the midday sun climbs to 68° in summer but only 22° in winter.
| Date | Sunrise | Azimuth | Sunset | Azimuth | Noon sun | Daylight |
|---|---|---|---|---|---|---|
| March equinox (Mar 20) | 6:54 AM | 90° E | 7:03 PM | 271° W | 45° | 12h 09m |
| June solstice (Jun 21) | 5:04 AM | 55° NE | 8:42 PM | 305° NW | 68° | 15h 37m |
| September equinox (Sep 22) | 6:38 AM | 89° E | 6:50 PM | 271° W | 45° | 12h 11m |
| December solstice (Dec 21) | 7:27 AM | 123° ESE | 4:12 PM | 237° WSW | 22° | 8h 46m |
Azimuth is measured clockwise from true north (90° = east, 270° = west). Computed for 2026; values change by less than a degree from year to year.
Golden hour & blue hour by month
Steam is most visible on cold mornings; backlight from a low sun makes rising steam glow.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 6:53 AM | 7:26 AM | 8:12 AM | 3:49 PM | 4:35 PM | 5:08 PM | 9h 09m |
| February | 6:22 AM | 6:52 AM | 7:34 AM | 4:37 PM | 5:19 PM | 5:49 PM | 10h 26m |
| March | 6:35 AM | 7:04 AM | 7:43 AM | 6:18 PM | 6:57 PM | 7:26 PM | 11h 53m |
| April | 5:36 AM | 6:06 AM | 6:46 AM | 6:56 PM | 7:36 PM | 8:07 PM | 13h 30m |
| May | 4:48 AM | 5:22 AM | 6:05 AM | 7:31 PM | 8:13 PM | 8:48 PM | 14h 51m |
| June | 4:27 AM | 5:04 AM | 5:49 AM | 7:55 PM | 8:40 PM | 9:17 PM | 15h 36m |
| July | 4:43 AM | 5:19 AM | 6:03 AM | 7:51 PM | 8:35 PM | 9:11 PM | 15h 17m |
| August | 5:21 AM | 5:53 AM | 6:34 AM | 7:18 PM | 7:59 PM | 8:31 PM | 14h 06m |
| September | 6:01 AM | 6:30 AM | 7:09 AM | 6:25 PM | 7:03 PM | 7:33 PM | 12h 33m |
| October | 6:37 AM | 7:07 AM | 7:47 AM | 5:27 PM | 6:07 PM | 6:37 PM | 11h 00m |
| November | 6:17 AM | 6:49 AM | 7:34 AM | 3:38 PM | 4:23 PM | 4:55 PM | 9h 34m |
| December | 6:49 AM | 7:23 AM | 8:12 AM | 3:22 PM | 4:10 PM | 4:44 PM | 8h 47m |
Local time (America/Los Angeles), including daylight saving time. Golden hour runs from about −4° to +6° solar altitude, so the morning golden hour begins during blue hour, before sunrise.
Milky Way & night sky
From Medical Hot Spring, the Milky Way core is visible in a dark sky from April through August. June gives the longest window (about 3.2 hours on a moonless night), and the core peaks around 16° above the southern horizon. Our light-pollution model puts the sky at about Bortle 2 (typical truly dark site), which is excellent for astrophotography.
| Month | Core visible (15th) | Hours | Max altitude | Direction |
|---|---|---|---|---|
| January | Below 10° in darkness | — | -4° | — |
| February | Below 10° in darkness | — | 7° | — |
| March | 4:55 AM – 5:15 AM | 0.3 | 12° | SSE → SSE |
| April | 2:54 AM – 4:14 AM | 1.3 | 15° | SSE → S |
| May | 12:52 AM – 3:02 AM | 2.2 | 16° | SSE → S |
| June | 11:13 PM – 2:23 AM | 3.2 | 16° | SSE → SSW |
| July | 10:56 PM – 1:06 AM | 2.2 | 16° | S → SSW |
| August | 9:54 PM – 11:04 PM | 1.2 | 15° | SSW → SSW |
| September | 8:44 PM – 9:04 PM | 0.3 | 12° | SSW → SSW |
| October | Below 10° in darkness | — | 7° | — |
| November | Below 10° in darkness | — | -3° | — |
| December | Below 10° in darkness | — | -20° | — |
Window when the galactic core is at least 10° high during astronomical darkness on the 15th of each month. Pick nights within a few days of the new moon. Plan exact nights with the Milky Way planner.
Estimated sky darkness: 2 Bortle 2 — Typical truly dark site. The summer Milky Way shows rich structure; clouds look like black holes in the stars. Modeled zenith brightness ≈ 21.89 mag/arcsec². Aurora needs roughly Kp 5.5+ to show low on the northern horizon here.
Weather & best season
Long-term NASA satellite data for this area show July as the clearest month (about 29% average cloud cover) and March as the cloudiest (75%). July is the warmest month and December the coldest, which matters for gear, snow access and how long batteries last at night.
Average cloud cover (%)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 48 | 53 | 67 | 78 | 88 | 97 | 102 | 100 | 97 | 87 | 64 | 52 |
| Low °F | -14 | -9 | 5 | 16 | 23 | 29 | 36 | 36 | 26 | 11 | -3 | -11 |
| Precip. (in) | 2.9 | 2.8 | 3.0 | 2.5 | 2.6 | 2.2 | 0.5 | 0.6 | 1.0 | 1.9 | 2.6 | 3.5 |
Monthly climatology for the surrounding 1° grid cell from NASA POWER (MERRA-2). Mountain sites can be colder and cloudier than the cell average.
Photography tips for this hot spring
- Condensation forms quickly on lenses; let gear acclimate and carry a cloth.
- Keep to boardwalks and marked paths — crusts around thermal features can be thin and the water dangerously hot.
- A polarizer brings out the colors of mineral terraces and microbial mats.
- Respect bathers' privacy: ask before including people at soaking pools.
- Wind direction determines where steam drifts; shoot from the upwind side to see the pool.
- Shoot RAW to keep the most latitude for high-contrast sunrise and sunset scenes.
Season: Winter gives the most dramatic steam; some primitive springs are only accessible in summer.
Suggested gear: Circular polarizer, Lens cloth, Telephoto for distant pools. Work out exposures with the depth of field, ND filter and NPF rule calculators.
Nearby photo spots
Other locations within 25 km of Medical Hot Spring, closest first.
Campgrounds nearby (Recreation.gov)
- North Fork Catherine Creek Group Campground14.6 km (9.1 mi) · reservable
- Two Color Guard Station15.4 km (9.5 mi) · reservable
- Moss Springs Campground29 km (18 mi)
FAQ
When is the best time to photograph Medical Hot Spring?
What time is golden hour at Medical Hot Spring?
Where does the sun rise and set at Medical Hot Spring?
Can you see the Milky Way from Medical Hot Spring?
Do you need a permit to photograph at Medical Hot Spring?
How far is Medical Hot Spring from Union?
Sources
Location data: USGS GNIS / GeoNames. Sun, moon and Milky Way times are computed by LWPhoto Atlas for 2026. Climate: NASA POWER. Sky darkness is a population-based estimate (Walker's law), not a measurement. See data sources & licenses.