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United States weather

Weather in Alameda County, California for September 2027

Your guide to Alameda County weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in Alameda County at the beginning of September is 20.3 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 18.5 °C by the end of September.

    • Rain 🌧️

  • With an average of 2 rainy days, Alameda County experiences minimal rainfall in September.

    • More

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

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

Average dry days
28
Dry days
Average rainy days
2
Rainy days
Average snowy days
0
Snow days
Average temperatures
19°/13°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
83 %
Avg humidity

Alameda County Weather September

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

Temperatures trend during September in Alameda County

See the weather trend as well as the moving average line

September weather in Alameda County day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Light rain
Light rain
 19° /13° 3.8 mm 4
Sept. 2 Mist
Mist
 19° /14° 0 mm 5
Sept. 3 Patchy rain possible
Patchy rain possible
 22° /14° 1.4 mm 5
Sept. 4 Mist
Mist
 20° /14° 0.8 mm 6
Sept. 5 Mist
Mist
 21° /13° 0 mm 6
Sept. 6 Mist
Mist
 20° /13° 0 mm 6
Sept. 7 Mist
Mist
 22° /13° 0 mm 6
Sept. 8 Fog
Fog
 23° /14° 0 mm 6
Sept. 9 Fog
Fog
 22° /14° 0 mm 4
Sept. 10 Fog
Fog
 20° /14° 0 mm 5
Sept. 11 Fog
Fog
 19° /13° 0 mm 5
Sept. 12 Mist
Mist
 20° /13° 0 mm 6
Sept. 13 Fog
Fog
 19° /13° 0 mm 6
Sept. 14 Fog
Fog
 22° /14° 0 mm 6
Sept. 15 Mist
Mist
 19° /14° 0 mm 5
Sept. 16 Mist
Mist
 18° /13° 0.2 mm 5
Sept. 17 Mist
Mist
 17° /13° 0.3 mm 4
Sept. 18 Light rain
Light rain
 18° /13° 7.7 mm 5
Sept. 19 Fog
Fog
 17° /13° 0 mm 4
Sept. 20 Overcast
Overcast
 17° /13° 0 mm 3
Sept. 21 Mist
Mist
 17° /13° 0 mm 4
Sept. 22 Fog
Fog
 18° /12° 0 mm 5
Sept. 23 Mist
Mist
 20° /13° 0 mm 5
Sept. 24 Mist
Mist
 19° /13° 0 mm 4
Sept. 25 Mist
Mist
 18° /13° 0 mm 5
Sept. 26 Fog
Fog
 18° /13° 0 mm 4
Sept. 27 Fog
Fog
 18° /13° 0 mm 5
Sept. 28 Mist
Mist
 18° /13° 0 mm 4
Sept. 29 Partly cloudy
Partly cloudy
 19° /13° 0 mm 5
Sept. 30 Mist
Mist
 21° /14° 0.5 mm 5
Next
Important Notice
Our weather forecast for Alameda 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 Alameda County forecast closer to your planned date for the most up-to-date weather information.
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Alameda County in September - FAQ

What are the expected maximum and minimum temperatures in Alameda County during September?
Enjoy moderate daytime temperatures of up to 19° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Alameda County during September?
Expect minimal rainfall in Alameda County during September, with a total of 14.8 mm over approximately 2 days. This minimal precipitation is unlikely to significantly impact plans.

What are the typical wind conditions in Alameda County during September?
The average wind speed in Alameda County during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Alameda County

Explore the daily rainfall trends and prepare for Alameda Countys September weather 💧
Typically, Alameda County has 2 rainy days in September with a total of 14.8 mm of rainfall.

UV exposure in Alameda County during September

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