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San Juan County (Silverton)
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United States weather

Weather in San Juan County, Colorado for September 2026

Your guide to San Juan County weather in September - trends and predictions

    Snow Forecast ❄️

  • With an average of 2 snowy days, San Juan County usually enjoys a light touch of snow in September.
    According to San Juan County snow forecast for September 2026, 1 snowy day is expected until the end of the month at Tuesday, September 29.

    • Temperatures

  • So far, September 2026 in San Juan County is slightly warmer than the historical average by 2 °F.

  • The forecast for the coming days of September 2026 predicts a temperature of 14.1 °F , which is warmer than usual.

  • In general, the average temperature in San Juan County at the beginning of September is 16.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 11.4 °F by the end of September.

    • Rain 🌧️

  • The climate of San Juan County in September is notably wet, with an average of 13 rainy days, and a total of 137.3 mm of precipitation.

    • More

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Average dry days
15
Dry days
Average rainy days
13
Rainy days
Average snowy days
2
Snow days
Average temperatures
11°/4°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
57 %
Avg humidity

San Juan County Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Partly cloudy
17°
2
Partly cloudy
16°
3
Thundery outbreaks possible
17°
4
Partly cloudy
18°
5
Moderate or heavy rain shower
15°
6
Moderate or heavy rain shower
15°
7
Thundery outbreaks possible
15°
8
Sunny
17°
9
Heavy rain at times
14°
10
Heavy rain at times
14°
11
Moderate or heavy rain shower
14°
12
Sunny
13°
13
Sunny
13°
14
Patchy rain possible
12°
15
Moderate rain at times
13°
16
Moderate or heavy rain shower
11°
17
Moderate or heavy rain shower
9°
18
Sunny
12°
19
Sunny
11°
20
Sunny
11°
21
Moderate or heavy rain shower
11°
22
Light freezing rain
8°
23
Patchy rain possible
9°
24
Partly cloudy
11°
25
Partly cloudy
12°
26
Patchy rain possible
13°
27
Overcast
16°
28
Light sleet showers
6°
29
Light rain shower
11°
30
Patchy rain possible
11°

Temperatures trend during September in San Juan County

See the weather trend as well as the moving average line

September weather in San Juan County day by day

Click on a date for more information
August October
Date Weather Temperatures Rain Snow More
Sept. 1 Partly cloudy
Partly cloudy
 17° /4° 0 mm 0 cm
Sept. 2 Partly cloudy
Partly cloudy
 16° /6° 0 mm 0 cm
Sept. 3 Thundery outbreaks possible
Thundery outbreaks possible
 17° /6° 0.2 mm 0 cm
Sept. 4 Partly cloudy
Partly cloudy
 18° /8° 0.1 mm 0 cm
Sept. 5 Moderate or heavy rain shower
Moderate or heavy rain shower
 15° /6° 10.6 mm 0 cm
Sept. 6 Moderate or heavy rain shower
Moderate or heavy rain shower
 15° /6° 10.9 mm 0 cm
Sept. 7 Thundery outbreaks possible
Thundery outbreaks possible
 15° /6° 0.6 mm 0 cm
Sept. 8 Sunny
Sunny
 17° /7° 0 mm 0 cm
Sept. 9 Heavy rain at times
Heavy rain at times
 14° /5° 0.8 mm 0 cm
Sept. 10 Heavy rain at times
Heavy rain at times
 14° /4° 1.6 mm 0 cm
Sept. 11 Moderate or heavy rain shower
Moderate or heavy rain shower
 14° /3° 9.5 mm 0 cm
Sept. 12 Sunny
Sunny
 13° /2° 2.5 mm 0 cm
Sept. 13 Sunny
Sunny
 13° /2° 1.8 mm 0 cm
Sept. 14 Patchy rain possible
Patchy rain possible
 12° /1° 3.1 mm 0 cm
Sept. 15 Moderate rain at times
Moderate rain at times
 13° /3° 1.2 mm 0 cm
Sept. 16 Moderate or heavy rain shower
Moderate or heavy rain shower
 11° /3° 3.3 mm 0 cm
Sept. 17 Moderate or heavy rain shower
Moderate or heavy rain shower
 9° /3° 12.5 mm 0 cm
Sept. 18 Sunny
Sunny
 12° /2° 0.6 mm 0 cm
Sept. 19 Sunny
Sunny
 11° /2° 2.2 mm 0 cm
Sept. 20 Sunny
Sunny
 11° /2° 2 mm 0 cm
Sept. 21 Moderate or heavy rain shower
Moderate or heavy rain shower
 11° /1° 4.7 mm 0.3 cm
Sept. 22 Light freezing rain
Light freezing rain
 8° /-1° 8.3 mm 2.7 cm
Sept. 23 Patchy rain possible
Patchy rain possible
 9° /1° 2.4 mm 0 cm
Sept. 24 Partly cloudy
Partly cloudy
 11° /1° 1.7 mm 0 cm
Sept. 25 Partly cloudy
Partly cloudy
 12° /3° 3 mm 0 cm
Sept. 26 Patchy rain possible
Patchy rain possible
 13° /2° 0.2 mm 0 cm
Sept. 27 Overcast
Overcast
 16° /4° 0 mm 0 cm
Sept. 28 Light sleet showers
Light sleet showers
 6° /4° 4.5 mm 0 cm
Sept. 29 Light rain shower
Light rain shower
 11° /3° 5.9 mm 2 cm
Sept. 30 Patchy rain possible
Patchy rain possible
 11° /4° 2.3 mm 0 cm
Next
Important Notice
Our weather forecast for San Juan County in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the San Juan County forecast closer to your planned date for the most up-to-date weather information.
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San Juan County in September - FAQ

What are the expected maximum and minimum temperatures in San Juan County during September?
Prepare for cooler days with highs just around 11° and colder nights, dipping below 4°.

How much rainfall should be expected in San Juan County during September?
Significant rainfall exceeding 137.3 mm is expected in San Juan County during September, occurring over more than 13 days. Preparing for wet conditions is recommended in your planning.

Will it snow in San Juan County in September 2026?
San Juan County experiences an average snowfall of 4.5 cm during September, occurring over 2 days.

What are the typical wind conditions in San Juan County during September?
The average wind speed in San Juan County during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.

San Juan County snow forecast September 2026

Track daily snowfall levels and discover San Juan County’s snowy potential this September ❄️
On average, San Juan County sees 2 snowy days during September, with approximately 4.5 cm of total snowfall.

September rainfall patterns in San Juan County

Explore the daily rainfall trends and prepare for San Juan Countys September weather 💧
Typically, San Juan County has 13 rainy days in September with a total of 137.3 mm of rainfall.
Top locations in San Juan County
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Oljato-Monument ValleySilverton
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Location coordinates Where is San Juan County?

Get accurate weather forecasts for San Juan County, located at latitude 37.812 and longitude -107.665. Stay updated with localized weather information tailored for San Juan County.

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