Climate and monthly weather forecast
Gaithersburg, MD

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The climate of Gaithersburg

Gaithersburg, nestled in the heart of Maryland, USA, boasts a predominantly Humid subtropical climate, as per the Köppen climate classification with its code being Cfa. This code correlates with no dry seasons throughout the year, painting a picture of a region that experiences relatively high amounts of precipitation and humidity. The sky remains dominated by clouds with an average cloud cover ranging from 30% to 46%.

Throughout the year, the average high temperature fluctuates from 38.8°F (3.8°C) in the cold season to a peak of 86.9°F (30.5°C) during the warm months. The average low ranges from a chilly 25.2°F (-3.8°C) to a moderate 67.6°F (19.8°C). Precipitation patterns cover the area in a wet blanket throughout the year, with an average rainfall measure between 1.73" (44mm) to 3.82" (97mm) per month.

Gaithersburg also experiences snowfall, typically from December to March, with January witnessing the most snowfall at 2.76" (70mm). The wind blows in at an average speed from 4.9mph (7.9km/h) to 8mph (12.9km/h), indicating a calm to moderate breeze. Unique conditions emerge in July, when Gaithersburg experiences the highest temperature, rainfall, and wind gusts of 12.1mph (19.5km/h).

The best time to visit Gaithersburg

The ideal time to visit Gaithersburg is betwixt May and June. The average high temperature during these months span from 73.6°F (23.1°C) to 81.3°F (27.4°C), providing pleasant weather for outdoor activities. Despite the slightly increased rainfall amounts in these months, the relatively high temperature balances it out and creates a welcoming atmosphere for tourists. The daylight hours are longest in these months, offering ample time to explore the locale.

The worst time to visit Gaithersburg

Tourists are advised to avoid planning a trip to Gaithersburg between December and February as these are the coldest months. The temperature during this period plunges to an average low from 25.2°F (-3.8°C) to 27.9°F (-2.3°C). Additionally, the area sees snowfall with January registering the highest, slightly less than 3" (76mm). The frequent snowfall and low temperatures are not ideal if someone seeks to engage in outdoor activities and sightseeing.

Spring weather in Gaithersburg

Spring in Gaithersburg, enveloping March, April, and May, is marked by a gradual increase in temperature, soaring from an average low of 35.6°F (2°C) to an average high of 73.6°F (23.1°C). The rainfall measures consistently rise from 2.13" (54mm) to 3.19" (81mm), respectively. The city experiences a ramping up of daylight hours from 12 hours to 14.3 hours, bringing in an abundance of sunshine that bodes well for springtime explorations.

Summer weather in Gaithersburg

In Gaithersburg, Summer takes hold from June to August, with average high temperatures rising from a comfortable 81.3°F (27.4°C) - reaching a zenith in July at 86.9°F (30.5°C), before slightly receding to 84.6°F (29.2°C) in August. The humidity remains more or less stable in the mid-70s percentile. The rainfall increases notably in this period, culminating in August with 3.82" (97mm). Despite the increased wetness, the ample sun and warmth make it an enjoyable time for visitors.

Autumn weather in Gaithersburg

Autumn descends on Gaithersburg from September to November. The atmosphere cools down during this period with the average high temperature steadily declining from 77.7°F (25.4°C) to 53.1°F (11.7°C) - a marked contrast to summer’s warmth. Rainfall decreases as well during autumn, tapering off to 2.13" (54mm) by November. However, the dropping temperatures and receding rain make the autumnal months quite pleasant and ideal for sightseeing.

Winter weather in Gaithersburg

Winter wields its cold grasp on Gaithersburg from December to February, bringing an average low temperature that scuds from 32.2°F (0.1°C) to 25.2°F (-3.8°C). The daylight hours shrink to the shortest of the year in December at 9.5 hours, and the sun shines for a fewer number of days. Additionally, the months of January and February experience snowfall ranging from 2.76" (70mm) to 2.36" (60mm). The chill, limited sunshine, and snowy conditions make winter less welcoming for travelers.

Weather in January

With its icy and raw conditions, Gaithersburg, Maryland's January weather offers a characteristic winterscape. Despite being the second coldest month of the year, January sees temperatures ranging from 25.2°F (-3.8°C) to 38.8°F (3.8°C). Weather in January »

Weather in February

A transition towards warmer temperatures begins in February. A slight rise in temperature, from January's freezing cold, features temperatures that fluctuate from 27.9°F (-2.3°C) to 43.2°F (6.2°C). The frosty conditions still persist with regular snowfall, though lesser compared to January. Weather in February »

Weather in March

The salient feature of Gaithersburg's March weather is the significant jump in temperatures from a low of 35.6°F (2°C) to a high of 51.4°F (10.8°C). The onset of spring is evident, and warmer days are more frequent. The city receives increased daylight, igniting the mood for outdoor activities. Weather in March »

Weather in April

April showcases a marked transformation in the weather conditions of Gaithersburg. Spring is in full bloom, and temperatures display an upward trend, now ranging from 45.5°F (7.5°C) to 63.9°F (17.7°C). The city witnesses a transition from cold to moderate conditions. Weather in April »

Weather in May

May marks the onset of warmer climates, with temperatures from 55°F (12.8°C) to 73.6°F (23.1°C). Gaithersburg's idyllic Spring conditions are surely a treat in the month of May. The rainfall propels the city's flora into full bloom, translating into a vibrant palette of colors. Weather in May »

Weather in June

In June, Gaithersburg weather transitions towards the summer season. The city experiences notable rising temperatures making their way from 62.8°F (17.1°C) to 81.3°F (27.4°C). With the increase in sunshine duration, parks and beaches become popular hangout spots. Weather in June »

Weather in July

July, the hot and humid peak of summer is graced with the highest average temperatures between 67.6°F (19.8°C) and 86.9°F (30.5°C). Known for its sunny and clear skies, July is the ideal month for soaking up the Gaithersburg summer sun. Weather in July »

Weather in August

August almost mirrors July when it comes to weather in Gaithersburg. The temperature fluctuates from 66.4°F (19.1°C) to 84.6°F (29.2°C), making it the second warmest month of the year. There is an increase in rainfall levels, providing respite from the blazing sun. Weather in August »

Weather in September

Gaithersburg's September weather represents the gateway to fall, with temperatures declining from the peak summer highs to a range from 59.9°F (15.5°C) to 77.7°F (25.4°C). September sees a fall in both humidity and precipitation levels compared to August. Weather in September »

Weather in October

October ushers in a crisp, enchanting fall season in Gaithersburg. The temperature range shifts to a more comfortable bracket from 49.3°F (9.6°C) to 65.3°F (18.5°C). October days glorify the autumn season with bright, changing leaves and cool temperatures. Weather in October »

Weather in November

The fall leaves give way to winter's onset in November, as the temperature continues to drop to the range of 38.3°F (3.5°C) to 53.1°F (11.7°C). Despite cool temperatures, the weather remains largely dry with occasional showers. Weather in November »

Weather in December

December's chill becomes more pronounced, ushering in the true winter spirit with temperatures ranging from 32.2°F (0.1°C) to 44.2°F (6.8°C). Gaithersburg experiences a colder and festive atmosphere during this month. Snowfall makes a comeback after a long absence since early spring. Weather in December »
Updated: Aug 1, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest month?

January, noted for its average high-temperature of 38.8°F (3.8°C) and an average low-temperature of 25.2°F (-3.8°C), is considered the coldest month.

What is the driest month?

The month with the least rainfall is January, when the rain falls for 8.7 days and typically collects 1.73" (44mm) of precipitation.

How many days does it rain?

Throughout the year, in Gaithersburg, there are 154.8 rainfall days, and 29.09" (739mm) of precipitation is accumulated.

When does it snow?

January through May, November and December are months with snowfall.

What is the snowiest month?

January is the month with the most snowfall. Snow falls for 4.8 days and accumulates 2.76" (70mm) of snow.

How much does it snow?

In Gaithersburg, during the entire year, snow falls for 16.7 days and aggregates up to 9.76" (248mm) of snow.

What is the month with the least sunshine?

The months with the least sunshine are January, February and December, with an average of 5.1h of sunshine.

What are the months with the lowest UV index?

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

When is Daylight Saving Time (DST)?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.

What are the most humid months?

The months with the highest humidity are May, October and December, with an average relative humidity of 77%.

What are the months with the highest UV index?

The months with the highest UV index are May through August, with an average maximum UV index of 6.

When it does not snow?

June through October are months without snowfall.

When are the longest days?

The month with the longest days is June, with an average of 14h and 54min of daylight.

What time of the year is the hottest?

The warmest period tends to be July, when average temperatures fluctuate between a high of 86.9°F (30.5°C) and a low of 67.6°F (19.8°C).

What is the least humid month?

July is the least humid month in Gaithersburg, with an average relative humidity of 72%.

What month has the most sunshine?

The month with the most sunshine is July, with an average of 10.8h of sunshine.

What is the rainiest month?

The month with the most rainfall is August, when the rain falls for 16.7 days and typically aggregates up to 3.82" (97mm) of precipitation.

What is the month with the shortest days?

With an average of 9h and 30min of daylight, December has the shortest days of the year.
Today
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Long-term
YearJFMAMJJASOND

Average temperature
Gaithersburg, MD

Average temperature - Gaithersburg, MD

The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is January (38.8°F).

The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).

Average pressure
Gaithersburg, MD

Average pressure - Gaithersburg, MD

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed
Gaithersburg, MD

Average wind speed - Gaithersburg, MD

The windiest month (with the highest average wind speed) is March (8mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

Average humidity
Gaithersburg, MD

Average humidity - Gaithersburg, MD

The months with the highest relative humidity are May, October and December (77%).
The month with the lowest relative humidity is July (72%).

Average rainfall
Gaithersburg, MD

Average rainfall - Gaithersburg, MD

The wettest month (with the highest rainfall) is August (3.82").
The driest month (with the least rainfall) is January (1.73").

Average rainfall days
Gaithersburg, MD

Average rainfall days - Gaithersburg, MD

The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (8.7 days).

Average snowfall
Gaithersburg, MD

Average snowfall - Gaithersburg, MD

The month with the highest snowfall is January (2.76").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days
Gaithersburg, MD

Average snowfall days - Gaithersburg, MD

The month with the highest number of snowfall days is February (5.3 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

Average daylight / Average sunshine
Gaithersburg, MD

Average daylight / Average sunshine - Gaithersburg, MD

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 6min).

Average sunshine days
Gaithersburg, MD

Average sunshine days - Gaithersburg, MD

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is July (11.5 days).

Average UV index
Gaithersburg, MD

Average UV index - Gaithersburg, MD

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover
Gaithersburg, MD

Average cloud cover - Gaithersburg, MD

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).

Average visibility
Gaithersburg, MD

Average visibility - Gaithersburg, MD

The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).

Gaithersburg, Maryland, USA

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