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United States weather

Weather in Alameda County, California for September 2026

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 19.9 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 17.7 °C by the end of September.

    • Rain 🌧️

  • Precipitation in Alameda County during September is a rare event, with an average of fewer than 2 rainy days.

    • More

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

Average dry days
29
Dry days
Average rainy days
1
Rainy days
Average snowy days
0
Snow days
Average temperatures
18°/13°
Temperatures
Average wind speed
17 km/h
Avg max wind
Average humidity
85 %
Avg humidity

Alameda County Weather September

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

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 Patchy rain possible
Patchy rain possible
 19° /13° 0.1 mm 4
Sept. 2 Mist
Mist
 18° /13° 0 mm 5
Sept. 3 Mist
Mist
 22° /13° 0 mm 5
Sept. 4 Mist
Mist
 20° /13° 0 mm 5
Sept. 5 Mist
Mist
 21° /13° 0 mm 5
Sept. 6 Mist
Mist
 19° /13° 0 mm 5
Sept. 7 Mist
Mist
 20° /13° 0 mm 5
Sept. 8 Fog
Fog
 19° /12° 0 mm 5
Sept. 9 Fog
Fog
 19° /13° 0 mm 5
Sept. 10 Fog
Fog
 18° /13° 0 mm 5
Sept. 11 Fog
Fog
 19° /13° 0 mm 5
Sept. 12 Mist
Mist
 19° /13° 0 mm 5
Sept. 13 Fog
Fog
 19° /13° 0 mm 5
Sept. 14 Fog
Fog
 21° /13° 0 mm 5
Sept. 15 Mist
Mist
 18° /13° 0 mm 4
Sept. 16 Mist
Mist
 18° /13° 0.2 mm 4
Sept. 17 Mist
Mist
 17° /12° 0 mm 4
Sept. 18 Mist
Mist
 17° /12° 10.3 mm 4
Sept. 19 Fog
Fog
 16° /13° 0 mm 4
Sept. 20 Mist
Mist
 17° /13° 0 mm 4
Sept. 21 Mist
Mist
 17° /12° 0 mm 4
Sept. 22 Fog
Fog
 18° /11° 0 mm 4
Sept. 23 Mist
Mist
 18° /12° 0 mm 4
Sept. 24 Mist
Mist
 17° /12° 0 mm 4
Sept. 25 Mist
Mist
 17° /13° 0 mm 4
Sept. 26 Fog
Fog
 18° /12° 0.1 mm 4
Sept. 27 Fog
Fog
 18° /12° 0 mm 4
Sept. 28 Mist
Mist
 17° /12° 0 mm 4
Sept. 29 Partly cloudy
Partly cloudy
 17° /13° 0 mm 4
Sept. 30 Mist
Mist
 20° /14° 0.7 mm 4
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 18° 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 11.3 mm over approximately 1 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 17 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 1 rainy days in September with a total of 11.3 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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Location coordinates Where is Alameda County?

Get accurate weather forecasts for Alameda County, located at latitude 37.804 and longitude -122.271. Stay updated with localized weather information tailored for Alameda County.

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