San Juan County Climate and Average Weather
Climate of San Juan County: average temperatures, rainfall and seasons month by month.
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).
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 |
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.
What this means for San Juan County
Today is much colder than average for October. The forecast high of 45°F is 15.5°F below the 60°F typical for this month.
Rain is very unlikely today - plans do not need a backup.
Overnight lows near 34°F mean ice is possible on bridges before dawn.
Northern Hemisphere, so peak summer falls in June to August.
The gap between the warmest and coldest month averages 77°F.
What to pack, what to skip
- A warm mid-layer and gloves for early mornings and evenings
- A packable rain shell - 3 of the next 7 days carry a real chance of rain
- If your dates are flexible, avoid January, February and December - historically the least comfortable months here.
Summary
San Juan County is a county in Utah. San Juan County is a county in the United States. It has a population of about 14.500.
Right now it is 39°F (4°C) in San Juan County with clear. It feels like 36°F. Today runs from 34°F to 45°F. Chance of precipitation is 2%. Sightseeing conditions score 8/10 - good conditions.
The best time to visit San Juan County is May, June, July and September. The climate is continental. January, February and December tend to be the least comfortable months. July is the warmest month with average highs near 83°F, while January is the coldest with lows near 19°F.
The closest major airport is Salt Lake City International Airport (SLC), about 248 mi away. Nearby highlights include Monument Valley, Canyonlands National Park, Dead Horse Point State Park and Arches National Park.
In plain terms. Today is much colder than average for October. The forecast high of 45°F is 15.5°F below the 60°F typical for this month. The best window to be outside is roughly 3 PM to 6 PM, when temperature, rain chance and wind line up best. stargazing is the strongest bet in San Juan County today at 9.9/10. Overnight lows near 34°F mean ice is possible on bridges before dawn.
Compiled from this page's own data: atlas facts plus live Open-Meteo readings.
Quick facts about San Juan County
| Type | County |
|---|---|
| State | Utah |
| Country | United States |
| Continent | North America |
| Coordinates | 37°37′30″N 109°47′60″W (37.625, -109.8) |
| Population | 14.500 |
| Local time | 7:06 PM (UTC-06:00) |
| Best months | May, June, July and September |
| Climate | Continental |
Weather map for San Juan County
Animated model layers. Pick a layer to load it.
Animated layers by Windy. For pin-level detail and nearby places, see the interactive map below.
Explore San Juan County
Every topic we hold for this place, and the same topic for the places around it.
Climate 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 39°F (4°C) with clear. Humidity is 84% and wind is 1 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 7:06 PM.
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 26, 2026 at 7:06 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
