Sunnyvale weather in September (California, United States of America)
What can you expect from the weather in Sunnyvale during September? Check out this comprehensive weather guide.
In Sunnyvale the weather in September is generally perfect, with high temperatures and almost no rainfall. September falls within the summer season. Anticipate daytime temperatures around 27°C, while night temperatures can drop to 14°C. On average, it is the warmest month of the year. So be prepared and pack summer clothes. Embrace the warmth, but always stay equipped with your summer essentials to make the most of this toasty month.
Sunnyvale in September usually receives almost no rainfall, averaging around 2.8 mm for the month. Based on our climate data of the past 30 years, about 1 day of rain are anticipated.
With around 270 hours of sunshine, the days are mostly sunny. It gives a pleasant and vibrant feel to the area.
If you favor pleasant temperatures and minimal rainfall, September is one of the better months to visit Sunnyvale. April, May, June, July, August, September and October typically offer the most agreeable circumstances. On the other hand, January, February and December tend to be characterized by conditions that may not be as optimal.
For an in-depth look at the yearly conditions, visit our specialized Sunnyvale climate page with graphs.
Sunnyvale, monthly averages in September
Min Temperature
14°C
Max Temperature
27°C
Chance of Rain
3%
Precipitation
2.8 mm
Rainy days
1 day
Humidity
73% *
Sunshine
270 hours *
Percentage Sunshine
73% *
Where to go in the United States of America in September
Find out more about the weather in the United States of America in September and which places have the best weather conditions in this month.
perfect weather
pleasant
tolerable
unpleasant
poor
So, what should you wear in Sunnyvale in September?
It's going to be warm! Consider airy clothing, t-shirts, and other summer clothes. Shorts for men made of cotton or linen are good options for staying cool.What To Do
We rated the following activities from 1 (least suitable) to 10 (best) to do in September.
Interested in more climate information?
Weather and Climate provides you with all the information you need about the climate in Sunnyvale.
Our site offers climate and forecast data for every country in the world. Are you going to the United States of America? On this website you can find historical weather averages for many cities in the United States of America. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal climate conditions. Find out where to go with our weather planner.
