Gaithersburg weather in July

In July, Gaithersburg sees average daytime highs of 87°F and overnight lows near 69°F, with 4.0 in of rain across 11.3 wet days and about 14.5 hours of daylight. It is the 1st-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 87°F through the month. The sky is clear or mostly clear about 28% of the time in July, and the air most often feels muggy.

Daylight stretches from about 14 h 42 min at the start of July to 14 h 06 min by month's end. Set against the rest of the year, July is Gaithersburg's 5th-clearest and 11th-windiest month. For the whole year in context, see Gaithersburg's year-round climate.

Daytime high
87°
1st warmest
Overnight low
69°
12th coldest
Rainfall
4.0 in
11.3 wet days
Daylight
14 h 30 min
4:59 AM – 7:29 PM
Cloud cover
58%
5th clearest
Wind
5 mph
11th windiest
Solar energy
6.02 kWh/m²
Travel score
4.6
out of 10

Gaithersburg is city in Montgomery County, Maryland, United States; suburb of Washington, D.C..

Density
2,518/km²
people per km²
Founded
1802

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 87°F through the month.

A typical July day in Gaithersburg reaches about 87°F in the afternoon and slips back to 69°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 79°F and 95°F. Set against its neighbours, July runs about 4°F warmer than June and about 2°F warmer than August.

60°70°80°90°100°151015202531
Avg high (°F)Avg low (°F)
18668
28668
38668
48668
58668
68769
78769
88769
98769
108769
118769
128769
138769
148769
158769
168769
178770
188770
198770
208770
218770
228770
238770
248770
258770
268769
278769
288769
298669
308669
318669

How July really feels in Gaithersburg

Once humidity and wind are folded in, July averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

July sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Gaithersburg weather by month

How July compares with the rest of the year at a glance. July is the 1st-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan41° / 27°3.18.63.19.60.1
Feb44° / 29°2.88.43.210.50.8
Mar53° / 36°3.810.22.311.73.0
Apr65° / 46°3.410.40.2135.7
May73° / 55°3.811.5014.16.5
Jun83° / 64°3.610.8014.75.7
Jul87° / 69°4.011.3014.54.6
Aug85° / 67°3.410.5013.55.3
Sep78° / 60°4.59.3012.36.9
Oct66° / 49°3.47.80116.4
Nov55° / 38°3.07.70.39.93.7
Dec45° / 32°3.58.81.99.31.1

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% of the time in July.

Beyond those clear spells, partly cloudy skies cover about 23% of July, with mostly cloudy or overcast conditions the remaining 50%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15050
25050
35149
45149
55149
65149
75248
85248
95149
105248
115248
125347
135347
145347
155347
165248
175248
185050
195050
205050
215050
224951
234951
244852
254852
264951
274951
284852
294852
304852
314852

Chance of precipitation in July

Any precipitation

Gaithersburg gets around 4.0 in of rain over 11.3 wet days in July. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 36% and peaks near 39% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
138
238
338
437
537
636
736
836
935
1035
1134
1234
1334
1434
1534
1635
1735
1835
1936
2036
2137
2237
2337
2438
2538
2638
2739
2839
2938
3038
3138

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

Most of July feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, July lands in the muggy band about 35% of days. Sticky, muggy-or-worse air turns up on roughly 54% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
11217233413
21217233414
31217233414
41216233414
51216243415
61215243415
71215243416
81114243416
91114253316
101114253317
111014253317
121013253418
13913253418
14913253419
15913253419
16813253420
17812253420
18712253421
19712253521
20712253521
21612253522
22611253622
23611253622
24611253722
25611253722
26611243722
27611243721
28611243821
29711243821
30711243720
31711243720

Wind in July

Winds average 5 mph in July.

Across July, daily wind ranges from about 5 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in July

DaylightNight

Daylight runs from about 14 h 42 min at the start of July to 14 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 36 minutes over July. Sunrise moves from 4:51 AM to 5:12 AM, and sunset from 7:34 PM to 7:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.74:517:34
214.74:517:34
314.74:517:34
414.74:527:33
514.74:527:33
614.74:537:33
714.74:547:33
814.64:547:33
914.64:557:32
1014.64:557:32
1114.64:567:32
1214.64:577:31
1314.64:577:31
1414.54:587:30
1514.54:597:30
1614.54:597:29
1714.55:007:29
1814.55:017:28
1914.45:027:28
2014.45:027:27
2114.45:037:26
2214.45:047:26
2314.35:057:25
2414.35:067:24
2514.35:077:23
2614.35:077:23
2714.25:087:22
2814.25:097:21
2914.25:107:20
3014.15:117:19
3114.15:127:18

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 6.02 kWh/m².

For context, solar energy here swings from a low near 1.91 kWh/m² to a high of 6.15 kWh/m² in June across the year — July's 6.02 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.3Intense
26.3Intense
36.3Intense
46.3Intense
56.3Intense
66.3Intense
76.3Intense
86.3Intense
96.2Intense
106.2Intense
116.2Intense
126.2Intense
136.2Intense
146.2Intense
156.1Intense
166.1Intense
176.1Intense
186.0Intense
196.0Intense
206.0Bright
215.9Bright
225.9Bright
235.9Bright
245.8Bright
255.8Bright
265.8Bright
275.8Bright
285.7Bright
295.7Bright
305.7Bright
315.7Bright
Planning a trip in July

Is July a good time to visit Gaithersburg?

Our two travel scores rate July for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.6
Sightseeing
7th-best month of the year
6.6
Beach & pool
2nd-best month of the year

July is a reasonable time to visit Gaithersburg for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Gaithersburg in July

From July's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In July, Gaithersburg sees daytime highs around 87°F and nights near 69°F. Pack light clothes and sun protection. Worth having: rain gear. About 11 days see rain.

light clothessun protectionrain gear

UV index in Gaithersburg in July

LowModerateHighVery highExtreme

Clear-sky midday UV in July peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Gaithersburg peaks around July 11 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJul 11UV 9Dec 19UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5High
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug7High
Sep6High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Gaithersburg in July

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where July falls, not just the annual average.

Air quality in Gaithersburg is worst in July — around 17 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (November, 9 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1317 µg/m³Nov 129 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb12Moderate
Mar13Moderate
Apr13Moderate
May15Moderate
Jun16Moderate
Jul17Moderate
Aug15Moderate
Sep12Moderate
Oct9Good
Nov9Good
Dec10Good
Location & terrain

Where is Gaithersburg?

Gaithersburg sits at 39.1°N, 77.2°W, 502 ft above sea level, in United States. The nearest listed city is Montgomery Village, 2.5 mi away.

Topography around Gaithersburg

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Gaithersburg.

Within 2 miles, the terrain around Gaithersburg has only modest variations in elevation — a maximum elevation change of 259 ft around an average of 453 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 912 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,375 ft.

The land around Gaithersburg is covered by trees (52%) and artificial surfaces (34%) within 2 miles, trees (67%) within 10 miles, and trees (60%) within 50 miles.

2 miles
259 ft
10 miles
912 ft
50 miles
2,375 ft
treesgrasslandcroplandartificial surfaceswater
July weather nearby: Montgomery Village 2.5 mi · Redland 3.1 mi · Germantown 4.3 mi · Rockville 5.0 mi · North Potomac 5.6 mi · Olney 7.5 mi · North Bethesda 8.1 mi · Aspen Hill 8.1 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Gaithersburg (39.1434°, -77.2014°, elevation 502 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).