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San Juan County (Oljato-Monument Valley)
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United States weather

Weather in San Juan County, Utah for September 2025

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

    Official Weather Alert ⚠️

  • Flood Watch - See hour by hour.

    • Temperatures

  • Until now, September 2025 in San Juan County has been nearly identical to the historical average, with a temperature of 27.8 °F (showing only a slight deviation of -0.2 °F).

  • The forecast for the upcoming days in San Juan County predicts a temperature of 29.6 °F, which is slightly above the historical average.

  • In general, the average temperature in San Juan County at the beginning of September is 28 °F. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 30.3 °F by the end of September.

    • Rain 🌧️

  • With an average of 4 rainy days, San Juan County experiences minimal rainfall in September.

    • More

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

Average dry days
26
Dry days
Average rainy days
4
Rainy days
Average snowy days
0
Snow days
Average temperatures
27°/14°
Temperatures
Average wind speed
22 km/h
Avg max wind
Average humidity
34 %
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
Cloudy
30°
2
Cloudy
31°
3
Thundery outbreaks possible
29°
4
Light rain shower
28°
5
Moderate or heavy rain shower
25°
6
Thundery outbreaks possible
25°
7
Partly cloudy
28°
8
Sunny
28°
9
Cloudy
28°
10
Partly cloudy
28°
11
Overcast
28°
12
Sunny
26°
13
Weather Alert Sunny
27°
14
Sunny
29°
15
Sunny
31°
16
Sunny
30°
17
Sunny
31°
18
Sunny
29°
19
Partly cloudy
28°
20
Sunny
28°
21
Sunny
28°
22
Sunny
28°
23
Sunny
30°
24
Sunny
33°
25
Sunny
32°
26
Patchy rain possible
30°
27
Sunny
29°
28
Partly cloudy
29°
29
Cloudy
30°
30
Sunny
29°

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 UV More
Sept. 1 Cloudy
Cloudy
 30° /18° 0 mm 7
Sept. 2 Cloudy
Cloudy
 31° /18° 0 mm 7
Sept. 3 Thundery outbreaks possible
Thundery outbreaks possible
 29° /16° 0 mm 6
Sept. 4 Light rain shower
Light rain shower
 28° /14° 9.6 mm 6
Sept. 5 Moderate or heavy rain shower
Moderate or heavy rain shower
 25° /15° 17.9 mm 6
Sept. 6 Thundery outbreaks possible
Thundery outbreaks possible
 25° /15° 11.8 mm 6
Sept. 7 Partly cloudy
Partly cloudy
 28° /13° 0 mm 7
Sept. 8 Sunny
Sunny
 28° /13° 0 mm 7
Sept. 9 Cloudy
Cloudy
 28° /16° 0 mm 7
Sept. 10 Partly cloudy
Partly cloudy
 28° /15° 0 mm 7
Sept. 11 Overcast
Overcast
 28° /16° 0 mm 7
Sept. 12 Sunny
Sunny
 26° /14° 0 mm 7
Sept. 13 Sunny
Sunny
 27° /11° 0 mm 1.7
Sept. 14 Sunny
Sunny
 29° /10° 0 mm 1.9
Sept. 15 Sunny
Sunny
 31° /10° 0 mm 1.9
Sept. 16 Sunny
Sunny
 30° /11° 0 mm 1.9
Sept. 17 Sunny
Sunny
 31° /19° 0 mm 0
Sept. 18 Sunny
Sunny
 29° /19° 0 mm 6
Sept. 19 Partly cloudy
Partly cloudy
 28° /21° 0 mm 6
Sept. 20 Sunny
Sunny
 28° /18° 0 mm 6
Sept. 21 Sunny
Sunny
 28° /18° 0 mm 6
Sept. 22 Sunny
Sunny
 28° /18° 0 mm 6
Sept. 23 Sunny
Sunny
 30° /17° 0 mm 6
Sept. 24 Sunny
Sunny
 33° /20° 0 mm 7
Sept. 25 Sunny
Sunny
 32° /20° 0 mm 7
Sept. 26 Patchy rain possible
Patchy rain possible
 30° /17° 0.3 mm 5
Sept. 27 Sunny
Sunny
 29° /17° 0 mm 7
Sept. 28 Partly cloudy
Partly cloudy
 29° /16° 0 mm 7
Sept. 29 Cloudy
Cloudy
 30° /17° 0 mm 7
Sept. 30 Sunny
Sunny
 29° /15° 0 mm 7
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?
Enjoy moderate daytime temperatures of up to 27° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in San Juan County during September?
In September, San Juan County can expect light to moderate rainfall, totaling 45.8 mm across approximately 4 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in San Juan County during September?
The average wind speed in San Juan County during September is 22 km/h, suggesting breezy to windy conditions, depending on your activities.

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 37.031 and longitude -110.251. Stay updated with localized weather information tailored for San Juan County.

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