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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 2026

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

    Temperatures

  • Until now, September 2026 in San Juan County has been nearly identical to the historical average, with a temperature of 26.3 °F (showing only a slight deviation of 0.3 °F).

  • The forecast for the upcoming days in San Juan County predicts a temperature of 24.6 °F, which is slightly above the historical average.

  • In general, the average temperature in San Juan County at the beginning of September is 27.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23.4 °F by the end of September.

    • Rain 🌧️

  • San Juan County experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 70.5 mm.

    • More

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

Average dry days
22
Dry days
Average rainy days
8
Rainy days
Average snowy days
0
Snow days
Average temperatures
26°/13°
Temperatures
Average wind speed
23 km/h
Avg max wind
Average humidity
39 %
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
28°
2
Cloudy
29°
3
Thundery outbreaks possible
28°
4
Light rain shower
28°
5
Moderate or heavy rain shower
26°
6
Thundery outbreaks possible
27°
7
Partly cloudy
28°
8
Sunny
29°
9
Sunny
29°
10
Partly cloudy
29°
11
Overcast
29°
12
Sunny
27°
13
Sunny
27°
14
Sunny
27°
15
Overcast
27°
16
Patchy rain possible
26°
17
Sunny
24°
18
Sunny
24°
19
Sunny
26°
20
Sunny
26°
21
Moderate or heavy rain shower
23°
22
Patchy rain possible
23°
23
Sunny
24°
24
Sunny
23°
25
Sunny
26°
26
Sunny
26°
27
Overcast
26°
28
Light rain shower
21°
29
Light rain shower
19°
30
Patchy rain possible
23°

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
 28° /16° 0 mm 9
Sept. 2 Cloudy
Cloudy
 29° /18° 0 mm 9
Sept. 3 Thundery outbreaks possible
Thundery outbreaks possible
 28° /16° 0 mm 9
Sept. 4 Light rain shower
Light rain shower
 28° /16° 4.8 mm 8
Sept. 5 Moderate or heavy rain shower
Moderate or heavy rain shower
 26° /16° 8.9 mm 8
Sept. 6 Thundery outbreaks possible
Thundery outbreaks possible
 27° /17° 6.4 mm 4
Sept. 7 Partly cloudy
Partly cloudy
 28° /15° 0.1 mm 8
Sept. 8 Sunny
Sunny
 29° /16° 0 mm 8
Sept. 9 Sunny
Sunny
 29° /16° 0 mm 8
Sept. 10 Partly cloudy
Partly cloudy
 29° /16° 0 mm 8
Sept. 11 Overcast
Overcast
 29° /16° 0.3 mm 8
Sept. 12 Sunny
Sunny
 27° /14° 0.2 mm 7
Sept. 13 Sunny
Sunny
 27° /14° 1.5 mm 8
Sept. 14 Sunny
Sunny
 27° /13° 0.9 mm 7
Sept. 15 Overcast
Overcast
 27° /14° 0.6 mm 6
Sept. 16 Patchy rain possible
Patchy rain possible
 26° /14° 1.3 mm 5
Sept. 17 Sunny
Sunny
 24° /13° 1.6 mm 5
Sept. 18 Sunny
Sunny
 24° /10° 0.2 mm 7
Sept. 19 Sunny
Sunny
 26° /12° 0 mm 7
Sept. 20 Sunny
Sunny
 26° /12° 1.2 mm 7
Sept. 21 Moderate or heavy rain shower
Moderate or heavy rain shower
 23° /11° 2.1 mm 6
Sept. 22 Patchy rain possible
Patchy rain possible
 23° /11° 0.2 mm 5
Sept. 23 Sunny
Sunny
 24° /12° 0.2 mm 4
Sept. 24 Sunny
Sunny
 23° /10° 0 mm 5
Sept. 25 Sunny
Sunny
 26° /13° 0.4 mm 6
Sept. 26 Sunny
Sunny
 26° /18° 0 mm 7.3
Sept. 27 Overcast
Overcast
 26° /19° 0 mm 6.4
Sept. 28 Light rain shower
Light rain shower
 21° /17° 6.6 mm 6.6
Sept. 29 Light rain shower
Light rain shower
 19° /14° 14 mm 5.5
Sept. 30 Patchy rain possible
Patchy rain possible
 23° /14° 6.5 mm 6.3
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 26° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.

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 70.5 mm spread over approximately 8 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in San Juan County during September?
The average wind speed in San Juan County during September is 23 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 💧
Typically, San Juan County has 8 rainy days in September with a total of 70.5 mm of rainfall.

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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