The best times to visit Simi Valley for ideal weather are

March 12th to June 17th

or

September 24th to December 2nd

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.

 

 


Other Simi Valley Travel Info

Weather in Simi Valley

Temperature

Average temperatures in Simi Valley vary greatly. Considering humidity, temperatures feel nice most of the year, excluding some cold weeks in the winter, with a very low chance of rain or snow throughout the year. The area is more temperate than most — in the 61st percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Simi Valley, the hottest months are July, August, and then September. See average monthly temperatures below. The warmest time of year is generally late August to early September where highs are regularly around 96.9°F (36.1°C) with temperatures rarely dropping below 67.9°F (19.9°C) at night.

Simi Valley Temperatures (Fahrenheit)

Key
High
Average
Low

Simi Valley Temperatures (Celsius)

Key
High
Average
Low

“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Simi Valley Perceived Temperature (F)

Key
High
Average
Low

Simi Valley Perceived Temperature (C)

Key
High
Average
Low

 

Average Simi Valley Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 62.2 52.1 45.8
Feb 65.1 53.2 45.4
Mar 72.1 58.1 48.7
Apr 74.8 59 48.4
May 79.1 64.1 52.6
Jun 87.5 70.8 58.3
Jul 94.4 77 64
Aug 93.7 76.3 63.6
Sep 91 74.7 62.5
Oct 81.2 66.8 57.1
Nov 73.8 61.1 53.2
Dec 59.7 49.7 43.3

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 16.8 11.2 7.7
Feb 18.4 11.8 7.4
Mar 22.3 14.5 9.3
Apr 23.8 15 9.1
May 26.2 17.8 11.4
Jun 30.8 21.6 14.6
Jul 34.7 25 17.8
Aug 34.3 24.6 17.6
Sep 32.8 23.7 16.9
Oct 27.3 19.3 13.9
Nov 23.2 16.2 11.8
Dec 15.4 9.8 6.3

 


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Simi Valley are May, June, and then July. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around late February and early March. For example, on the week of February 26th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in late January with an average of 3 days of significant precipitation the week of January 22nd.

When can you find snow in Simi Valley? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Simi Valley.

Key
Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Simi Valley (in).

Key
Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 15% 0 5.6
Feb 12% 0 2.1
Mar 4% 0 0.6
Apr 3% 0 1
May 0% 0 0
Jun 0% 0 0
Jul 0% 0 0
Aug 0% 0 0
Sep 2% 0 2.4
Oct 3% 0 0.8
Nov 2% 0 0.3
Dec 10% 0 2

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 15 0 14.2
Feb 12 0 5.3
Mar 4 0 1.5
Apr 3 0 2.5
May 0 0 0
Jun 0 0 0
Jul 0 0 0
Aug 0 0 0
Sep 2 0 6.1
Oct 3 0 2
Nov 2 0 0.8
Dec 10 0 5.1

 

Humidity and Wind

Simi Valley has some comfortably humid months, and slightly dry months in the opposite season. The least humid month is November (33.7% relative humidity), and the most humid month is February (50.6%).

Wind in Simi Valley is usually calm. The windiest month is January, followed by March and May. January’s average wind speed of around 5.1 knots (5.9 MPH or 9.5 KPH) is considered “a light breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early to mid April where average top sustained speeds reach 12.4 knots, which is considered a moderate breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Simi Valley.

Key
Avg. Relative Humidity

Wind

The graph below shows wind speed (max and average) in knots.

Key
Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 5.1 Light breeze 11.1 Significant breeze
Feb 4.2 Light breeze 10.2 Gentle breeze
Mar 4.9 Light breeze 11.1 Significant breeze
Apr 4.6 Light breeze 10.6 Gentle breeze
May 4.6 Light breeze 9.8 Significant breeze
Jun 3.4 Barely noticeable 8.1 Gentle breeze
Jul 3.2 Barely noticeable 7.8 Significant breeze
Aug 3 Barely noticeable 7.4 Gentle breeze
Sep 3.2 Barely noticeable 7.8 Significant breeze
Oct 4.6 Light breeze 10 Gentle breeze
Nov 4.4 Light breeze 10.1 Significant breeze
Dec 4.5 Light breeze 9.8 Gentle breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 40.1%
Feb 50.6%
Mar 38.9%
Apr 41.1%
May 40.7%
Jun 41.3%
Jul 36.3%
Aug 35.1%
Sep 37.5%
Oct 34.6%
Nov 33.7%
Dec 41.4%

 

Is it Safe to Travel to Simi Valley?

Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Sep 23, 2019.


 

The Busiest and Least Crowded Months

The busiest month for tourism in Simi Valley, CA, US is July, followed by June and August. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Simi Valley in November. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month

 

Most Popular Months to Visit

Key
Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is slightly extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 33.6 in November means 33.6% of the tourists vs. July.

 

 

Overall Simi Valley Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderate. Highs range from 83.1°F (28.4°C) and 67.4°F (19.7°C) with warmer temperatures in the later months. Rain is extremely rare with 0 to 1 days of significant precipitation per month. Spring is the second busiest for tourism, which makes it a good time for those looking for things to do.

Summer (June through August)

The middle-year months have very comfortable weather with high temperatures that are quite warm. These months see the least precipitation with about 0 days of precipitation per month. June – August is the busiest season for tourism in Simi Valley, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 93.5°F (34.2°C) and 68.1°F (20.1°C), which will feel very nice given the humidity and wind. It rains or snows a normal amount: approximately 1 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.

Winter (December through February)

Weather is too cold this time of year in Simi Valley to be enjoyable for warm weather travelers. The average high during this season is between 67.5°F (19.7°C) and 57.3°F (14.1°C). On average, it rains or snows a smalll amount: 3 to 5 times per month. These times of year are fairly slow with tourists.

 

Best Times to Travelthe United States › Simi Valley, CA, US