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.
Simi Valley Weather in September
In Simi Valley, September brings very high daytime temperatures around 30°C (86°F), with nights cooling to 16°C (61°F). Minimal rainfall is to be expected.
Rainfall in Simi Valley in September
Typically, you can expect about 0 days of rain this month, with 3.8 mm (0.1 in) on average. On the rare occasion it does rain, the shower can be quite heavy given the low total spread across a single day.
Temperature in Simi Valley in September
September is a good time to be in Simi Valley. Days are excellent, reaching 30°C (86°F), with nights around 16°C (61°F). It's usually most comfortable outside during the morning and later in the day. With lows of 16°C (61°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.
Sunshine in Simi Valley in September
The month enjoys around 278 hours of sunshine, creating mostly sunny days with good weather conditions.September in Simi Valley has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
Simi Valley Temperature in September
Min Temperature
16°C (61°F)
Max Temperature
30°C (86°F)
Chance of Rain
1%
Precipitation
3.8 mm (0.1 in)
Rainy days
0 days
Humidity
67% *
Sunshine
278 hours *
Percentage Sunshine
75% *
* Data from: Los Angeles, the United States of America (51 KM, 31 Miles).
Simi Valley Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Simi 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 Simi Valley in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Almost no rain is expected, so no need to bring rain gear. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.
What To Do in Simi Valley in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
-
Swimming10/10 -
Cycling8/10 -
Walking8/10 -
Barbeque10/10 -
Camping10/10 -
Outdoor sports8/10
Simi Valley 3-Day Forecast
More climate data for Simi Valley
Temperature Rainfall Sunshine Humidity
See the full Simi 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.