The weather in Barstow in September is hot. The average temperatures are between 20°C and 32°C.
You can expect a few rainy days in Barstow during September, but usually the weather is comfortable in September.
Our weather forecast can give you a great sense of what weather to expect in Barstow in September 2025.
If you’re planning to visit Barstow in the near future, we highly recommend that you review the 14 day weather forecast for Barstow before you arrive.
Temperatures
32° / 20°
Rainy Days
1
Snowy Days
0
Dry Days
29
Rainfall
2
mm
Sun Hours
11.6
Hrs