The best times to visit San Bernardino for ideal weather are

October 15th to December 9th

or

January 8th to June 3rd

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

 


San Bernardino Travel Guide

  • Safety
  • The busiest and least popular months
  • Overall travel experience by time of year
  • Weather in San Bernardino

    Temperature

    Average temperatures in San Bernardino vary somewhat and are seasonally temperate. The area is in the top 57 percent of tourist destinations for pleasant weather. 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 June. See average monthly temperatures below. The warmest time of year is generally mid-August where highs are regularly around 98.3°F (36.8°C) with temperatures rarely dropping below 71°F (21.7°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 68.6 59.3 45.6
    Feb 74.8 65 48.5
    Mar 79.6 69.4 52.3
    Apr 77.3 68.4 54.6
    May 74.9 66.2 55.9
    Jun 91.9 81.3 65.2
    Jul 90.4 80.5 66.8
    Aug 94.5 84 68
    Sep 92.3 82 66.8
    Oct 85.7 75.7 59.9
    Nov 72.9 63.7 49.3
    Dec 63.4 55.3 44.3

    Show Celsius

    Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
    Jan 20.3 15.2 7.6
    Feb 23.8 18.3 9.2
    Mar 26.4 20.8 11.3
    Apr 25.2 20.2 12.6
    May 23.8 19 13.3
    Jun 33.3 27.4 18.4
    Jul 32.4 26.9 19.3
    Aug 34.7 28.9 20
    Sep 33.5 27.8 19.3
    Oct 29.8 24.3 15.5
    Nov 22.7 17.6 9.6
    Dec 17.4 12.9 6.8

     
    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 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 0 0 0
    Feb 0 0 0
    Mar 0 0 0
    Apr 0 0 0
    May 0 0 0
    Jun 0 0 0
    Jul 0 0 0
    Aug 0 0 0
    Sep 0 0 0
    Oct 0 0 0
    Nov 0 0 0
    Dec 0 0 0

    Show Centimeters

    Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
    Jan 0 0 0
    Feb 0 0 0
    Mar 0 0 0
    Apr 0 0 0
    May 0 0 0
    Jun 0 0 0
    Jul 0 0 0
    Aug 0 0 0
    Sep 0 0 0
    Oct 0 0 0
    Nov 0 0 0
    Dec 0 0 0
    –>

     

    Humidity and Wind

    San Bernardino has far below average humidity compared to most tourist destinations. The least humid month is November (20.9% relative humidity), and the most humid month is May (37.6%).

    Wind in San Bernardino is usually moderate. The windiest month is April, followed by July and June. April’s average wind speed of around 6.1 knots (7 MPH or 11.3 KPH) is considered “light breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in late April where average top sustained speeds reach 15.7 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.

    Month Avg. Wind Meaning (Beaufort) Avg. Maximum Sustained Wind Meaning (Beufort)
    Jan 2.8 light air 8.7 a gentle breeze
    Feb 3.3 light air 8.3 a gentle breeze
    Mar 4.7 a light breeze 11.4 a gentle breeze
    Apr 6.1 a light breeze 13.8 a moderate breeze
    May 5.2 a light breeze 12.1 a gentle breeze
    Jun 5.6 a light breeze 11.5 a moderate breeze
    Jul 6.1 a light breeze 11.8 a gentle breeze
    Aug 5.5 a light breeze 12.2 a moderate breeze
    Sep 4.9 a light breeze 11.8 a gentle breeze
    Oct 4.4 a light breeze 10.6 a gentle breeze
    Nov 3.9 light air 10.5 a gentle breeze
    Dec 3.5 light air 8.7 a gentle breeze

    Show Relative Humidity by Month

    Month Avg. Relative Humidity
    Jan 29.6
    Feb 27.2
    Mar 21.1
    Apr 22.5
    May 37.6
    Jun 23.6
    Jul 30.7
    Aug 24.3
    Sep 26.7
    Oct 26.9
    Nov 20.9
    Dec 35.4

     

    Is it Safe to Travel to San Bernardino?

    As of 6/22/2017 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.
     

    Overall San Bernardino Travel Experience by Season

    Spring (March through May)

    Humidity and temperatures combine to make this season feel warm. Highs range from 86.5°F (30.3°C) and 62°F (16.7°C) with colder temperatures in the later months. Spring is slow/unreported for tourism, which makes it a good time for those looking for deals.

    Summer (June through August)

    The middle-year months have very comfortable weather with high temperatures that are quite warm. June – August is slow/unreported season for tourism in San Bernardino, so lodging and other accommodations may cost as much as usual.

    Fall (September through November)

    Fall daily highs range from 93.8°F (34.3°C) and 68.9°F (20.5°C), which will feel very nice given the humidity and wind. Tourism is slow/unreported during these months due to the weather, so hotels may be normally priced.

    Winter (December through February)

    Weather is somewhat cold this time of year in San Bernardino to be enjoyable for warm weather travelers. The average high during this season is between 80.9°F (27.2°C) and 57.7°F (14.3°C). These times of year are slow/unreported with tourists.