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San Juan County (Silverton)
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United States weather

Weather in San Juan County, Colorado for September 2027

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

    Snow Forecast ❄️

  • Snowfall in San Juan County during September is quite rare, with fewer than 2 snowy days on average.

    • Temperatures

  • In general, the average temperature in San Juan County at the beginning of September is 15.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 10.3 °C by the end of September.

    • Rain 🌧️

  • The climate of San Juan County in September is notably wet, with an average of 11 rainy days, and a total of 122.4 mm of precipitation.

    • More

  • Is September a good time to visit San Juan County? check out the best time to travel to San Juan County page.

  • ✨ Is September a good time to visit San Juan County? – Ask the AI Weatherman

Average dry days
18
Dry days
Average rainy days
11
Rainy days
Average snowy days
1
Snow days
Average temperatures
12°/4°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
59 %
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 rain
15°
6
Moderate rain
15°
7
Thundery outbreaks possible
15°
8
Sunny
17°
9
Patchy rain possible
14°
10
Patchy rain possible
14°
11
Moderate or heavy rain shower
13°
12
Light rain
13°
13
Patchy rain possible
12°
14
Light rain
12°
15
Patchy rain possible
12°
16
Light rain
11°
17
Moderate rain
8°
18
Sunny
11°
19
Patchy rain possible
11°
20
Patchy rain possible
11°
21
Light rain
10°
22
Light freezing rain
8°
23
Patchy rain possible
8°
24
Patchy rain possible
10°
25
Light rain
11°
26
Partly cloudy
11°
27
Heavy rain at times
12°
28
Moderate rain
8°
29
Light rain
10°
30
Light rain
9°

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° /7° 0 mm 0 cm
Sept. 3 Thundery outbreaks possible
Thundery outbreaks possible
 17° /7° 0.2 mm 0 cm
Sept. 4 Partly cloudy
Partly cloudy
 18° /8° 0.1 mm 0 cm
Sept. 5 Moderate rain
Moderate rain
 15° /7° 10.6 mm 0 cm
Sept. 6 Moderate rain
Moderate rain
 15° /6° 10.9 mm 0 cm
Sept. 7 Thundery outbreaks possible
Thundery outbreaks possible
 15° /7° 0.6 mm 0 cm
Sept. 8 Sunny
Sunny
 17° /8° 0 mm 0 cm
Sept. 9 Patchy rain possible
Patchy rain possible
 14° /5° 0.8 mm 0 cm
Sept. 10 Patchy rain possible
Patchy rain possible
 14° /4° 1.6 mm 0 cm
Sept. 11 Moderate or heavy rain shower
Moderate or heavy rain shower
 13° /4° 9.5 mm 0 cm
Sept. 12 Light rain
Light rain
 13° /2° 2.5 mm 0 cm
Sept. 13 Patchy rain possible
Patchy rain possible
 12° /3° 1.8 mm 0 cm
Sept. 14 Light rain
Light rain
 12° /1° 3.1 mm 0 cm
Sept. 15 Patchy rain possible
Patchy rain possible
 12° /3° 1.2 mm 0 cm
Sept. 16 Light rain
Light rain
 11° /4° 3.3 mm 0 cm
Sept. 17 Moderate rain
Moderate rain
 8° /4° 12.5 mm 0 cm
Sept. 18 Sunny
Sunny
 11° /2° 0.6 mm 0 cm
Sept. 19 Patchy rain possible
Patchy rain possible
 11° /2° 2.2 mm 0 cm
Sept. 20 Patchy rain possible
Patchy rain possible
 11° /2° 2 mm 0 cm
Sept. 21 Light rain
Light rain
 10° /2° 4.7 mm 0.3 cm
Sept. 22 Light freezing rain
Light freezing rain
 8° /0° 8.3 mm 2.7 cm
Sept. 23 Patchy rain possible
Patchy rain possible
 8° /1° 2.4 mm 0 cm
Sept. 24 Patchy rain possible
Patchy rain possible
 10° /2° 1.7 mm 0 cm
Sept. 25 Light rain
Light rain
 11° /3° 3 mm 0 cm
Sept. 26 Partly cloudy
Partly cloudy
 11° /3° 0.8 mm 0 cm
Sept. 27 Heavy rain at times
Heavy rain at times
 12° /2° 10 mm 0 cm
Sept. 28 Moderate rain
Moderate rain
 8° /3° 14.3 mm 0 cm
Sept. 29 Light rain
Light rain
 10° /2° 8.7 mm 0 cm
Sept. 30 Light rain
Light rain
 9° /4° 5.1 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 12° and colder nights, dipping below 4°.

How much rainfall should be expected in San Juan County during September?
Significant rainfall exceeding 122.4 mm is expected in San Juan County during September, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.

Will it snow in San Juan County in September 2027?
San Juan County typically sees 3 cm of snowfall during September.

What are the typical wind conditions in San Juan County during September?
The average wind speed in San Juan County during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.

San Juan County snow forecast September 2027

Track daily snowfall levels and discover San Juan County’s snowy potential this September ❄️
On average, San Juan County sees 1 snowy days during September, with approximately 3 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 11 rainy days in September with a total of 122.4 mm of rainfall.
Top locations in San Juan County
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Oljato-Monument ValleySilverton
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