The best times to visit San Bernardino for ideal weather are
October 15th to December 9th
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
Weather in San Bernardino
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)
San Bernardino Temperatures (Celsius)
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)
San Bernardino Perceived Temperature (C)
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.
|Month||Avg. High (°F)||Avg. Mean (°F)||Avg. Low (°F)|
|Month||Avg. High (°C)||Avg. Mean (°C)||Avg. Low (°C)|
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.
Snow on the Ground
The graph below shows the average snow on the ground in San Bernardino (in).
Average Rain and Snow by Month
|Month||Daily Chance of Rain||Average Snow Depth (in)||Total Precipitation (in)|
|Month||Daily Chance of Rain||Average Snow Depth (cm)||Total Precipitation (cm)|
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.
The graph below shows wind speed (max and average) in knots.
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|
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.