San Juan County Weather Forecast
San Juan County weather: 47°F, fog. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Climate in San Juan County month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Month | Avg high | Avg low | Rainfall | Rating |
|---|---|---|---|---|
| January | 36° | 19° | 1,0 in | ★★☆☆☆ |
| February | 41° | 24° | 1,5 in | ★★☆☆☆ |
| March | 50° | 30° | 0,9 in | ★★★☆☆ |
| April | 56° | 34° | 1,3 in | ★★★★☆ |
| May | 66° | 42° | 1,2 in | ★★★★☆ |
| June | 80° | 56° | 1,4 in | ★★★★★ |
| July | 83° | 60° | 1,5 in | ★★★★★ |
| August | 81° | 59° | 2,9 in | ★★★★☆ |
| September | 72° | 51° | 1,3 in | ★★★★★ |
| October | 60° | 41° | 4,1 in | ★★★☆☆ |
| November | 45° | 29° | 0,8 in | ★★★☆☆ |
| December | 41° | 25° | 0,6 in | ★★★☆☆ |
Climate type: Continental. Source: Open-Meteo archive (ERA5).
Best time to visit San Juan County
Go in May, June, July and September. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: January, February and December - expect the least comfortable mix of heat, cold or rain.
Recent extremes in San Juan County
Highest and lowest readings observed in the last 3 years of reanalysis data - not all-time records.
How San Juan County compares with nearby places
Annual averages, and the difference against San Juan County.
| Place | Distance | Avg temp | vs here | Annual rain |
|---|---|---|---|---|
| Monument Valley | 46 mi | 57°F | +40°F warmer | 6 in |
| Canyonlands National Park | 49 mi | 58°F | +41°F warmer | 5 in |
| Dead Horse Point State Park | 59 mi | 55°F | +39°F warmer | 7 in |
| Moab | 67 mi | 60°F | +43°F warmer | 8 in |
| Grand County | 67 mi | 60°F | +43°F warmer | 8 in |
What to pack, what to skip
- A warm mid-layer and gloves for early mornings and evenings
- A packable rain shell - 2 of the next 7 days carry a real chance of rain
- Avoid exposed ridgelines, small boats and rooftop viewpoints while gusts stay above 34 mph.
- If your dates are flexible, avoid January, February and December - historically the least comfortable months here.
See the San Juan County forecast by time range
San Juan County weather - more answers
Explore San Juan 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 San Juan County?
San Juan County is a county in Utah. Its coordinates are 37.625, -109.8. It lies in North America.
What is the weather like in San Juan County right now?
It is currently 47°F (8°C) with fog. Humidity is 100% and wind is 20 mph.
When is the best time to visit San Juan County?
May, June, July and September offer the most comfortable conditions in San Juan County, which has a continental climate. January, February and December are usually the hardest months for outdoor plans.
What time zone is San Juan County in?
San Juan County observes America/Denver (UTC-06:00). The local time is 12:40 AM.
How many people live in San Juan County?
San Juan County has a population of approximately 14.500.
What is the nearest airport to San Juan County?
The closest airports are Salt Lake City International Airport (SLC), 248 mi away.
What are the top things to do in San Juan County?
Popular options include Monument Valley, Canyonlands National Park, Dead Horse Point State Park, Arches National Park, Mesa Verde National Park and Mesa Verde (UNESCO World Heritage Site).
Related articles
Data sources and methodology
| 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 October 23, 2026 at 12:40 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
