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 | 80° | 58° | 2,2 in | ★★★★☆ |
| September | 71° | 51° | 1,7 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 | +41°F warmer | 6 in |
| Canyonlands National Park | 49 mi | 58°F | +42°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, August 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 about average for August. The forecast high of 80°F is in line with the 80°F typical for this month.
Rain is very unlikely today - plans do not need a backup.
No weather-related travel disruption is expected today. Roads and airports should run normally.
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
- Lightweight, light-coloured clothing and a refillable water bottle
- Sunglasses, a brimmed hat and SPF 30+
- 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 71°F (22°C) in San Juan County with overcast. It feels like 68°F. Today runs from 64°F to 80°F. Chance of precipitation is 7%. Sightseeing conditions score 9.6/10 - excellent - go now.
The best time to visit San Juan County is May, June, July, August 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 about average for August. The forecast high of 80°F is in line with the 80°F typical for this month. The best window to be outside is roughly 9 AM to 12 PM, when temperature, rain chance and wind line up best. sightseeing is the strongest bet in San Juan County today at 9.6/10. No weather-related travel disruption is expected today. Roads and airports should run normally.
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 | 4:45 AM (UTC-06:00) |
| Best months | May, June, July, August 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 71°F (22°C) with overcast. Humidity is 37% and wind is 4 mph.
When is the best time to visit San Juan County?
May, June, July, August 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 4:45 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 August 23, 2026 at 4:45 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
