The best times to visit Gaithersburg for ideal weather are

April 30th to June 24th

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



Other Gaithersburg Travel Info

Weather in Gaithersburg


Average temperatures in Gaithersburg vary drastically. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a fair chance of precipitation about half of the year. The area is less temperate than some — in the 27th 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 Gaithersburg, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally mid July where highs are regularly around 88.3°F (31.3°C) with temperatures rarely dropping below 67.4°F (19.7°C) at night.

Gaithersburg Temperatures (Fahrenheit)


Gaithersburg Temperatures (Celsius)


“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.

Gaithersburg Perceived Temperature (F)


Gaithersburg Perceived Temperature (C)



Average Gaithersburg 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 41.1 31.4 24.2
Feb 44.1 33.7 26
Mar 55.5 43.4 34.4
Apr 68.6 54.7 43.9
May 76.1 64.3 54.8
Jun 83.8 72.4 62.7
Jul 86.9 75.5 66.1
Aug 84.7 73 64
Sep 79 67.1 58.3
Oct 66.6 55.1 46.3
Nov 56.3 45.1 36.6
Dec 47.4 38.3 31.3

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 5.1 -0.3 -4.3
Feb 6.7 0.9 -3.3
Mar 13.1 6.3 1.3
Apr 20.3 12.6 6.6
May 24.5 17.9 12.7
Jun 28.8 22.4 17.1
Jul 30.5 24.2 18.9
Aug 29.3 22.8 17.8
Sep 26.1 19.5 14.6
Oct 19.2 12.8 7.9
Nov 13.5 7.3 2.6
Dec 8.6 3.5 -0.4



Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Gaithersburg are January, November, 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 July. For example, on the week of July 16th there is 1 day of precipitation on average. By contrast, it’s most likely to rain or snow in early to mid July with an average of 2 days of significant precipitation the week of July 9th.

When can you find snow in Gaithersburg? 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 Gaithersburg.

Days with precipitation

Snow on the Ground

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

Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 14% 0 1.7
Feb 18% 0 2.6
Mar 23% 0 3.2
Apr 19% 0 3.1
May 20% 0 4.5
Jun 22% 0 3.3
Jul 19% 0 2.4
Aug 17% 0 3.5
Sep 17% 0 2.8
Oct 19% 0 4
Nov 16% 0 2
Dec 20% 0 3.3

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 14 0 4.3
Feb 18 0 6.6
Mar 23 0 8.1
Apr 19 0 7.9
May 20 0 11.4
Jun 22 0 8.4
Jul 19 0 6.1
Aug 17 0 8.9
Sep 17 0 7.1
Oct 19 0 10.2
Nov 16 0 5.1
Dec 20 0 8.4


Humidity and Wind

Gaithersburg has some slightly muggy months, with moderately humid months on the other side of the year. The least humid month is March (47.3% relative humidity), and the most humid month is September (67.5%).

Wind in Gaithersburg is usually calm. The windiest month is February, followed by March and April. February’s average wind speed of around 5.7 knots (6.6 MPH or 10.6 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 February where average top sustained speeds reach 15.3 knots, which is considered a moderate breeze.

Relative Humidity (%)

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

Avg. Relative Humidity


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

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 12.7 Significant breeze
Feb 5.7 Light breeze 13.8 Significant breeze
Mar 5.4 Light breeze 12.5 Significant breeze
Apr 5.2 Light breeze 12.7 Significant breeze
May 4 Light breeze 10.8 Significant breeze
Jun 3.5 Barely noticeable 10.2 Gentle breeze
Jul 3 Barely noticeable 9.2 Significant breeze
Aug 2.8 Barely noticeable 8.8 Gentle breeze
Sep 2.9 Barely noticeable 8.7 Significant breeze
Oct 3.7 Barely noticeable 10.3 Gentle breeze
Nov 4.3 Light breeze 10.8 Significant breeze
Dec 4.9 Light breeze 11.9 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 51.2%
Feb 49%
Mar 47.3%
Apr 48.7%
May 60.7%
Jun 63.9%
Jul 64.7%
Aug 66.5%
Sep 67.5%
Oct 64.4%
Nov 55.2%
Dec 59.6%


Is it Safe to Travel to Gaithersburg?

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 Gaithersburg, MD, 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 Gaithersburg in October. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month


Most Popular Months to Visit

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 somewhat extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 56.1 in October means 56.1% of the tourists vs. July.



Overall Gaithersburg 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 46.2°F (7.9°C) with far warmer temperatures in the later months. Rain is somewhat common with 6 to 7 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 moderate precipitation with 5 to 6 days of precipitation per month. June – August is the busiest season for tourism in Gaithersburg, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 83.6°F (28.7°C) and 51.8°F (11°C), which will feel chilly given the humidity and wind. It rains or snows a significant amount: 5 to 6 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 far too cold this time of year in Gaithersburg to be enjoyable for warm weather travelers. The average high during this season is between 48.1°F (8.9°C) and 38.4°F (3.6°C). On average, it rains or snows a fair amount: 4 to 6 times per month. These times of year are fairly slow with tourists.


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