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San Juan County (Silverton)
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United States weather

Weather in San Juan County, Colorado for September 2025

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

    Official Weather Alert ⚠️

  • Flood Watch - See hour by hour.

    • Snow Forecast ❄️

  • Snowfall in San Juan County during September is quite rare, with fewer than 2 snowy days on average.
    According to San Juan County snow forecast for September 2025, 5 snowy days are expected in the next 2 weeks. The closest date with snow is Saturday, September 13.

    • Temperatures

  • Until now, September 2025 in San Juan County has been nearly identical to the historical average, with a temperature of 13 °F (showing only a slight deviation of -0.1 °F).

  • The forecast for the upcoming days in San Juan County predicts a temperature of 14.3 °F, which is slightly above the historical average.

  • In general, the average temperature in San Juan County at the beginning of September is 13 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 14.7 °F by the end of September.

    • Rain 🌧️

  • The climate of San Juan County in September is notably wet, with an average of 12 rainy days, and a total of 99.1 mm of precipitation.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
17
Dry days
Average rainy days
12
Rainy days
Average snowy days
1
Snow days
Average temperatures
12°/3°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
56 %
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
14°
2
Partly cloudy
15°
3
Thundery outbreaks possible
15°
4
Partly cloudy
16°
5
Moderate or heavy rain shower
9°
6
Moderate or heavy rain shower
10°
7
Thundery outbreaks possible
12°
8
Sunny
15°
9
Heavy rain at times
13°
10
Heavy rain at times
13°
11
Moderate or heavy rain shower
12°
12
Sunny
11°
13
Weather Alert Patchy rain possible
10°
14
Patchy rain possible
11°
15
Sunny
13°
16
Partly cloudy
15°
17
Partly cloudy
13°
18
Sunny
15°
19
Partly cloudy
15°
20
Patchy rain possible
9°
21
Patchy rain possible
11°
22
Sunny
13°
23
Sunny
24°
24
Sunny
22°
25
Sunny
16°
26
Patchy rain possible
13°
27
Heavy rain at times
12°
28
Overcast
13°
29
Patchy rain possible
13°
30
Partly cloudy
14°

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
 14° /4° 0 mm 0 cm
Sept. 2 Partly cloudy
Partly cloudy
 15° /7° 0 mm 0 cm
Sept. 3 Thundery outbreaks possible
Thundery outbreaks possible
 15° /9° 0 mm 0 cm
Sept. 4 Partly cloudy
Partly cloudy
 16° /10° 0 mm 0 cm
Sept. 5 Moderate or heavy rain shower
Moderate or heavy rain shower
 9° /6° 21.2 mm 0 cm
Sept. 6 Moderate or heavy rain shower
Moderate or heavy rain shower
 10° /6° 21.6 mm 0 cm
Sept. 7 Thundery outbreaks possible
Thundery outbreaks possible
 12° /6° 0 mm 0 cm
Sept. 8 Sunny
Sunny
 15° /8° 0 mm 0 cm
Sept. 9 Heavy rain at times
Heavy rain at times
 13° /5° 1.1 mm 0 cm
Sept. 10 Heavy rain at times
Heavy rain at times
 13° /5° 2.4 mm 0 cm
Sept. 11 Moderate or heavy rain shower
Moderate or heavy rain shower
 12° /3° 14.1 mm 0 cm
Sept. 12 Sunny
Sunny
 11° /2° 2.8 mm 0 cm
Sept. 13 Patchy rain possible
Patchy rain possible
 10° /2° 3 mm 2.2 cm
Sept. 14 Patchy rain possible
Patchy rain possible
 11° /-4° 1.3 mm 0.9 cm
Sept. 15 Sunny
Sunny
 13° /6° 0 mm 0 cm
Sept. 16 Partly cloudy
Partly cloudy
 15° /3° 0 mm 0 cm
Sept. 17 Partly cloudy
Partly cloudy
 13° /2° 0 mm 0 cm
Sept. 18 Sunny
Sunny
 15° /1° 0 mm 0 cm
Sept. 19 Partly cloudy
Partly cloudy
 15° /2° 0 mm 0 cm
Sept. 20 Patchy rain possible
Patchy rain possible
 9° /4° 3 mm 0.5 cm
Sept. 21 Patchy rain possible
Patchy rain possible
 11° /0° 0.8 mm 0.1 cm
Sept. 22 Sunny
Sunny
 13° /0° 0 mm 0 cm
Sept. 23 Sunny
Sunny
 24° /2° 0 mm 0 cm
Sept. 24 Sunny
Sunny
 22° /4° 0 mm 0 cm
Sept. 25 Sunny
Sunny
 16° /5° 0 mm 0 cm
Sept. 26 Patchy rain possible
Patchy rain possible
 13° /3° 1.2 mm 0.4 cm
Sept. 27 Heavy rain at times
Heavy rain at times
 12° /4° 2.5 mm 0 cm
Sept. 28 Overcast
Overcast
 13° /3° 0 mm 0 cm
Sept. 29 Patchy rain possible
Patchy rain possible
 13° /3° 0.5 mm 0 cm
Sept. 30 Partly cloudy
Partly cloudy
 14° /9° 0 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 3°.
How much rainfall should be expected in San Juan County during September?
Moderate rainfall is anticipated in San Juan County during September, with a total of 99.1 mm spread over approximately 12 days. Considering plans for rainy days is advisable.
Will it snow in San Juan County in September 2025?
San Juan County typically sees 1 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 13 km/h, suggesting breezy to windy conditions, depending on your activities.

San Juan County snow forecast September 2025

Track daily snowfall levels and discover San Juan County’s snowy potential this September ❄️

September rainfall patterns in San Juan County

Explore the daily rainfall trends and prepare for San Juan Countys September weather 💧

UV exposure in San Juan County during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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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