Weather in Reston in May

General weather information about Reston

Average annual temperature is 11.8 °C

Absolute maximum temperature: 42.2 °C

Absolute minimum temperature: -6.1 °C

Number of sunny days: 191 days

Number of rainy days: 171 days

Number of snow days: 3 days

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* Weather data for Reston United States is based on climate observations for 2026 year

Reston air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)14.517.217.632.031.533.036.142.234.030.219.917.3
Average daytime temperature (°C)9.510.510.014.622.226.430.732.224.920.113.712.2
Average temperature (°C)4.74.24.68.614.216.820.621.916.613.08.27.9
Average night temperature (°C)1.50.60.94.78.710.213.315.011.09.04.65.2
Absolute minimum temperature (°C)-6.1-4.3-3.3-0.92.65.710.29.06.30.3-3.4-0.4

Reston monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.011.012.014.015.015.015.014.013.011.010.09.0
Daylight mean duration (h)9.410.511.913.414.715.315.013.912.511.09.79.1
Daylight minimum duration (h)9.09.011.012.014.015.014.013.011.010.09.08.0
Sunshine mean duration (h)4.46.46.47.311.112.613.112.19.57.65.33.2
Precipitation (mm)14481155100413045659118218
Sunny days712491627312819161210
Rainy days241426211530311151821
Snow days021000000000

Reston - weather forecast by months

Reston weather in januaryReston weather in februaryReston weather in marchReston weather in aprilReston weather in mayReston weather in juneReston weather in julyReston weather in augustReston weather in septemberReston weather in octoberReston weather in novemberReston weather in december

Best time to visit Reston:

The best time to visit Reston during the most sunny months:

  • May — 11.1(h)
  • June — 12.6(h)
  • July — 13.1(h)
  • August — 12.1(h)

Months with the longest average daylight duration in Reston:

  • June — 15.3(h)

The largest precipitation sum in Reston is at

  • January — 144(mm)
  • March — 155(mm)
  • November — 118(mm)
  • December — 218(mm)

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    Frequently asked questions

    When is the best time to visit Reston?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Reston.
    What is the weather like in Reston?
    See average temperature, rainfall and daylight hours for Reston by month in the table above.
    How many sunny days does Reston have?
    The monthly weather statistics above show sunshine and rainfall patterns for Reston throughout the year.