The best times to visit San Ramon for ideal weather are

April 16th to July 8th

or

September 10th to November 11th

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

 

 


Other San Ramon Travel Info

Weather in San Ramon

Temperature

Average temperatures in San Ramon vary greatly. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a very low chance of rain or snow throughout the year. The area is somewhat temperate — in the 50th 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 Ramon, 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 93.2°F (34°C) with temperatures rarely dropping below 58.7°F (14.8°C) at night.

San Ramon Temperatures (Fahrenheit)

Key
High
Average
Low

San Ramon 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 Ramon Perceived Temperature (F)

Key
High
Average
Low

San Ramon Perceived Temperature (C)

Key
High
Average
Low

 

Average San Ramon 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 60.1 47.3 37.3
Feb 62.7 50.7 40.7
Mar 68.1 54.2 42.9
Apr 72.3 57 45.2
May 77.6 61.3 49.8
Jun 85.4 67.3 54.4
Jul 89.1 70 57.5
Aug 89.3 69.9 57.4
Sep 88.5 69.4 56.1
Oct 79.6 63.1 50.9
Nov 67.5 53.8 42.9
Dec 59.3 47.8 38.6

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 15.6 8.5 2.9
Feb 17.1 10.4 4.8
Mar 20.1 12.3 6.1
Apr 22.4 13.9 7.3
May 25.3 16.3 9.9
Jun 29.7 19.6 12.4
Jul 31.7 21.1 14.2
Aug 31.8 21.1 14.1
Sep 31.4 20.8 13.4
Oct 26.4 17.3 10.5
Nov 19.7 12.1 6.1
Dec 15.2 8.8 3.7

 


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in San Ramon are July, 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 mid June. For example, on the week of June 18th 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 2 days of significant precipitation the week of December 17th.

When can you find snow in San Ramon? 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 San Ramon.

Key
Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in San Ramon (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 12% 0 1.6
Feb 21% 0 2.2
Mar 11% 0 1.5
Apr 9% 0 0.9
May 3% 0 0.2
Jun 2% 0 0.2
Jul 0% 0 0
Aug 0% 0 0
Sep 1% 0 0.1
Oct 5% 0 0.8
Nov 13% 0 1.5
Dec 20% 0 3

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 12 0 4.1
Feb 21 0 5.6
Mar 11 0 3.8
Apr 9 0 2.3
May 3 0 0.5
Jun 2 0 0.5
Jul 0 0 0
Aug 0 0 0
Sep 1 0 0.3
Oct 5 0 2
Nov 13 0 3.8
Dec 20 0 7.6

 

Humidity and Wind

San Ramon has some slightly muggy months, with moderately humid months on the other side of the year. The least humid month is September (42% relative humidity), and the most humid month is December (62%).

Wind in San Ramon is usually calm. The windiest month is July, followed by June and May. July’s average wind speed of around 7.5 knots (8.6 MPH or 13.9 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in late May where average top sustained speeds reach 15.8 knots, which is considered a moderate breeze.

Relative Humidity (%)

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

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 3.7 Barely noticeable 11.1 Significant breeze
Feb 4.1 Light breeze 11.3 Significant breeze
Mar 4.4 Light breeze 12.3 Significant breeze
Apr 5.5 Light breeze 13.6 Significant breeze
May 6.9 Light breeze 14.9 Significant breeze
Jun 7 Gentle breeze 15 Significant breeze
Jul 7.5 Gentle breeze 15.3 Significant breeze
Aug 6.8 Light breeze 14.5 Significant breeze
Sep 5.1 Light breeze 13 Significant breeze
Oct 4 Light breeze 11.6 Significant breeze
Nov 3.3 Barely noticeable 10.6 Significant breeze
Dec 3.7 Barely noticeable 10.8 Gentle breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 61.2%
Feb 61.9%
Mar 56.1%
Apr 50.2%
May 46.7%
Jun 43.3%
Jul 44.6%
Aug 45.5%
Sep 42%
Oct 46.2%
Nov 56.8%
Dec 62%

 

Is it Safe to Travel to San Ramon?

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 San Ramon, 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 San Ramon 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 56.9 in November means 56.9% of the tourists vs. July.

 

 

Overall San Ramon Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderate. Highs range from 79.1°F (26.2°C) and 63.5°F (17.5°C) with warmer temperatures in the later months. Rain is rare with 1 to 4 days of significant precipitation per month. Spring is fairly slow 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. These months see the least precipitation with 0 to 1 days of precipitation per month. June – August is the busiest season for tourism in San Ramon, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 90.6°F (32.6°C) and 62.9°F (17.2°C), which will feel comfortable given the humidity and wind. It rains or snows a normal amount: 0 to 4 days per month. Tourism is the second busiest during these months due to the weather, so hotels may be slightly higher priced.

Winter (December through February)

Weather is too cold this time of year in San Ramon to be enjoyable for warm weather travelers. The average high during this season is between 64.3°F (17.9°C) and 57.7°F (14.3°C). On average, it rains or snows a fair amount: 4 to 6 times per month. These times of year are the slowest with tourists.

 

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