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Fairfax County (Herndon)
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United States weather

Weather in Fairfax County, Virginia for May 2027

Your guide to Fairfax County weather in May - trends and predictions

    Temperatures

  • In general, the average temperature in Fairfax County at the beginning of May is 19.3 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 24 °C by the end of May.

    • Rain 🌧️

  • Fairfax County in May brings notable rainfall, with an average of 17 rainy days and a total precipitation of 106.8 mm.

    • More

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Average dry days
14
Dry days
Average rainy days
17
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/12°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
72 %
Avg humidity

Fairfax County Weather May

Move between months or click on a day
April
June
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Overcast
17°
2
Overcast
13°
3
Partly cloudy
16°
4
Partly cloudy
25°
5
Partly cloudy
27°
6
Moderate or heavy rain shower
21°
7
Overcast
16°
8
Partly cloudy
20°
9
Overcast
21°
10
Patchy rain possible
26°
11
Moderate or heavy rain shower
14°
12
Sunny
20°
13
Heavy rain at times
22°
14
Overcast
14°
15
Overcast
20°
16
Partly cloudy
28°
17
Heavy rain at times
29°
18
Partly cloudy
33°
19
Sunny
34°
20
Moderate rain at times
33°
21
Moderate rain at times
21°
22
Moderate or heavy rain shower
14°
23
Moderate or heavy rain shower
11°
24
Patchy rain possible
20°
25
Moderate rain at times
21°
26
Moderate or heavy rain shower
25°
27
Moderate or heavy rain shower
24°
28
Cloudy
24°
29
Overcast
24°
30
Partly cloudy
23°
31
Sunny
27°

Temperatures trend during May in Fairfax County

See the weather trend as well as the moving average line

May weather in Fairfax County day by day

Click on a date for more information
April June
Date Weather Temperatures Rain UV More
May 1 Overcast
Overcast
 17° /5° 0.8 mm 8
May 2 Overcast
Overcast
 13° /6° 0.2 mm 8
May 3 Partly cloudy
Partly cloudy
 16° /3° 0 mm 9
May 4 Partly cloudy
Partly cloudy
 25° /8° 0 mm 9
May 5 Partly cloudy
Partly cloudy
 27° /14° 0 mm 10
May 6 Moderate or heavy rain shower
Moderate or heavy rain shower
 21° /13° 10.4 mm 4
May 7 Overcast
Overcast
 16° /10° 1.3 mm 2
May 8 Partly cloudy
Partly cloudy
 20° /6° 0 mm 10
May 9 Overcast
Overcast
 21° /11° 0 mm 10
May 10 Patchy rain possible
Patchy rain possible
 26° /10° 0.7 mm 10
May 11 Moderate or heavy rain shower
Moderate or heavy rain shower
 14° /9° 2.6 mm 3
May 12 Sunny
Sunny
 20° /5° 0 mm 10
May 13 Heavy rain at times
Heavy rain at times
 22° /12° 11.6 mm 9
May 14 Overcast
Overcast
 14° /9° 4.1 mm 6
May 15 Overcast
Overcast
 20° /10° 0 mm 8
May 16 Partly cloudy
Partly cloudy
 28° /10° 1.8 mm 10
May 17 Heavy rain at times
Heavy rain at times
 29° /17° 1.4 mm 9
May 18 Partly cloudy
Partly cloudy
 33° /17° 0 mm 11
May 19 Sunny
Sunny
 34° /20° 0 mm 10
May 20 Moderate rain at times
Moderate rain at times
 33° /19° 7.8 mm 10
May 21 Moderate rain at times
Moderate rain at times
 21° /13° 8.6 mm 3
May 22 Moderate or heavy rain shower
Moderate or heavy rain shower
 14° /11° 22.2 mm 2
May 23 Moderate or heavy rain shower
Moderate or heavy rain shower
 11° /10° 11.2 mm 2
May 24 Patchy rain possible
Patchy rain possible
 20° /12° 3.6 mm 2
May 25 Moderate rain at times
Moderate rain at times
 21° /15° 3.5 mm 2
May 26 Moderate or heavy rain shower
Moderate or heavy rain shower
 25° /17° 7.1 mm 4
May 27 Moderate or heavy rain shower
Moderate or heavy rain shower
 24° /18° 7.9 mm 4
May 28 Cloudy
Cloudy
 24° /16° 0 mm 11
May 29 Overcast
Overcast
 24° /11° 0 mm 11
May 30 Partly cloudy
Partly cloudy
 23° /15° 0 mm 11
May 31 Sunny
Sunny
 27° /9° 0 mm 11
Next
Important Notice
Our weather forecast for Fairfax County in May is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Fairfax County forecast closer to your planned date for the most up-to-date weather information.
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Fairfax County in May - FAQ

What are the expected maximum and minimum temperatures in Fairfax County during May?

Enjoy moderate daytime temperatures of up to 22° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Fairfax County during May?

Significant rainfall exceeding 106.8 mm is expected in Fairfax County during May, occurring over more than 17 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Fairfax County during May?

The average wind speed in Fairfax County during May is 16 km/h, suggesting breezy to windy conditions, depending on your activities.

May rainfall patterns in Fairfax County

Explore the daily rainfall trends and prepare for Fairfax Countys May weather 💧
Typically, Fairfax County has 17 rainy days in May with a total of 106.8 mm of rainfall.

UV exposure in Fairfax County during May

Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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Herndon
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Location coordinates Where is Fairfax County?

Get accurate weather forecasts for Fairfax County, located at latitude 38.97 and longitude -77.386. Stay updated with localized weather information tailored for Fairfax County.

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