The best times to visit San Bernardino for ideal weather are

March 12th to June 17th

or

October 8th to November 25th

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

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Weather in San Bernardino

Temperature

Average temperatures in San Bernardino vary greatly. Considering humidity, temperatures feel very nice much of the year, but hot in the summer and cold in the winter with a very low chance of rain or snow throughout the year. The area is somewhat temperate — in the 60th 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 San Bernardino, the hottest months are August, September, and then July. See average monthly temperatures below. The warmest time of year is generally late August to early September where highs are regularly around 98.1°F (36.7°C) with temperatures rarely dropping below 66.9°F (19.4°C) at night.

San Bernardino Temperatures (Fahrenheit)

Key
High
Average
Low

San Bernardino 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.

San Bernardino Perceived Temperature (F)

Key
High
Average
Low

San Bernardino Perceived Temperature (C)

Key
High
Average
Low

 

Average San Bernardino 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 71.4 57.2 44.3
Feb 70.7 56.4 44.5
Mar 75.8 60.3 47.6
Apr 78 62.5 50.5
May 82.1 66.6 55
Jun 87.3 70.7 58.8
Jul 92.8 76.3 64.4
Aug 95.5 78.1 65
Sep 94.5 77 63.9
Oct 85.4 69.2 56.7
Nov 76.8 61.6 48.8
Dec 67.7 54.7 43.7

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 21.9 14 6.8
Feb 21.5 13.6 6.9
Mar 24.3 15.7 8.7
Apr 25.6 16.9 10.3
May 27.8 19.2 12.8
Jun 30.7 21.5 14.9
Jul 33.8 24.6 18
Aug 35.3 25.6 18.3
Sep 34.7 25 17.7
Oct 29.7 20.7 13.7
Nov 24.9 16.4 9.3
Dec 19.8 12.6 6.5


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in San Bernardino are June, August, and then September. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early May. For example, on the week of April 30th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in mid December with an average of 1 days of significant precipitation the week of December 17th.

When can you find snow in San Bernardino? 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.

Chanceof Precipitation

The graph below shows the % chance of rainy and snowy days in San Bernardino.

Key
Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in San Bernardino (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 7% 0 1.1
Feb 10% 0 1.1
Mar 5% 0 0.6
Apr 4% 0 0.4
May 2% 0 0.1
Jun 0% 0 0
Jul 1% 0 0.3
Aug 0% 0 0.1
Sep 1% 0 0.3
Oct 2% 0 0.2
Nov 5% 0 0.5
Dec 13% 0 2.1

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 7 0 2.8
Feb 10 0 2.8
Mar 5 0 1.5
Apr 4 0 1
May 2 0 0.3
Jun 0 0 0
Jul 1 0 0.8
Aug 0 0 0.3
Sep 1 0 0.8
Oct 2 0 0.5
Nov 5 0 1.3
Dec 13 0 5.3

 

Humidity and Wind

San Bernardino has some comfortably humid months, and slightly dry months in the opposite season. The least humid month is January (31.1% relative humidity), and the most humid month is June (46.9%).

Wind in San Bernardino is usually extremely calm. The windiest month is May, followed by April and June. May’s average wind speed of around 4.5 knots (5.2 MPH or 8.4 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 May where average top sustained speeds reach 13.3 knots, which is considered a moderate breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in San Bernardino.

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 4.3 Light breeze 10.2 Gentle breeze
Feb 3.4 Barely noticeable 9.6 Gentle breeze
Mar 4 Light breeze 11.2 Gentle breeze
Apr 4.5 Light breeze 12.8 Significant breeze
May 4.5 Light breeze 12.6 Gentle breeze
Jun 4.3 Light breeze 12 Significant breeze
Jul 4.2 Light breeze 12 Gentle breeze
Aug 3.8 Barely noticeable 12 Significant breeze
Sep 3.5 Barely noticeable 11.4 Gentle breeze
Oct 3.4 Barely noticeable 10.2 Gentle breeze
Nov 3.7 Barely noticeable 9.5 Gentle breeze
Dec 3.3 Barely noticeable 8.8 Gentle breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 31.1%
Feb 44.1%
Mar 41.8%
Apr 41.5%
May 44.9%
Jun 46.9%
Jul 43.3%
Aug 38.7%
Sep 38.5%
Oct 40.3%
Nov 36.1%
Dec 42.9%

 

Is it Safe to Travel to San Bernardino?

Our best data indicates this area is generally safe. As of Jan 19, 2018 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


 

The Busiest and Least Crowded Months

The busiest month for tourism in San Bernardino, CA, US is July, followed by September 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 San Bernardino 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 32.8 in November means 32.8% of the tourists vs. July.


Overall San Bernardino Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderate. Highs range from 84.9°F (29.4°C) and 69.4°F (20.8°C) with warmer temperatures in the later months. Rain is rare with 1 to 2 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 San Bernardino, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 96.6°F (35.9°C) and 73.7°F (23.2°C), which will feel very nice given the humidity and wind. It rains or snows a normal amount: 0 to 2 days per month. Tourism is fairly slow during these months due to the weather, so hotels may be lower priced.

Winter (December through February)

Weather is somewhat cool this time of year in San Bernardino to be enjoyable for warm weather travelers. The average high during this season is between 73.1°F (22.8°C) and 65.3°F (18.5°C). On average, it rains or snows a smalll amount: 2 to 4 times per month. These times of year are the slowest with tourists.

 

Best Times to Travelthe United States › San Bernardino, CA, US

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