Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
Castro Valley Weather in September
Thinking of visiting Castro Valley in September? Expect high temperatures reaching 25°C (77°F) during the day, dropping to 13°C (55°F) at night, with minimal rainfall.
Rainfall in Castro Valley in September
Climate statistics over the past 30 years suggest around a single day of rain, with 4.2 mm (0.2 in) average for the month. On the rare occasion it rains, expect a brief, moderate shower rather than a heavy downpour.
Temperature in Castro Valley in September
September is one of the better months to visit Castro Valley. Expect 25°C (77°F) during the day and 13°C (55°F) at night. Summer occurs in September. Overall, the month follows a fairly predictable daily temperature pattern. With lows of 13°C (55°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest. On average, it sees the highest temps of the year.
Sunshine in Castro Valley in September
There are approximately 270 hours of sunshine this month, resulting in mostly clear days.If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit Castro Valley.
Castro Valley Temperature in September
Min Temperature
13°C (55°F)
Max Temperature
25°C (77°F)
Chance of Rain
3%
Precipitation
4.2 mm (0.2 in)
Rainy days
a single day
Humidity
73% *
Sunshine
270 hours *
Percentage Sunshine
73% *
* Data from: San Francisco, the United States of America (27 KM, 17 Miles).
Castro Valley Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Castro Valley - and find the best time to visit.
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Castro Valley in September
For Castro Valley in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Almost no rain is expected, so no need to bring rain gear. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.
What To Do in Castro Valley in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
-
Swimming10/10 -
Cycling10/10 -
Walking10/10 -
Barbeque9/10 -
Camping10/10 -
Outdoor sports10/10
Castro Valley 3-Day Forecast
More climate data for Castro Valley
Temperature Rainfall Sunshine Humidity
See the full Castro Valley climate overview or explore weather in the United States of America.
Popular in September
Where to go in September - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Yosemite National Park is definitely worth a visit
The 10 most alternative cities in the United States
Discover the top 10 fun and alternative U.S. cities rich in art, culture, and adventure. From Portland's hippy charm to Sedona's stunning landscapes.
Sedona: Explore Majestic Red Rock Landscapes
A picturesque artists' town surrounded by red rocks and known for its spirituality, vortex energy, and stunning hikes like Cathedral Rock.
10 most idyllic villages to visit in the United States
Discover 10 idyllic villages in the USA, from California to Vermont. Explore their unique charm, rich history, stunning nature, and vibrant arts scenes.