Manassas, Virginia Weather
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Climate of Manassas: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Manassas, with average daytime highs around 31°C. January is the coolest, when nights typically fall to about -5°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 36°C, so the seasons feel very different from each other.
The area receives about 1120 mm of rain in a typical year. Most of it falls from May to July and September, and May is the wettest month at roughly 120 mm.
For outdoor plans and travel, April, August and October usually offer the most comfortable weather in Manassas, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 4° | -5° | 65 mm | 82% |
| Feb | 6° | -4° | 67 mm | 81% |
| Mar | 11° | 0° | 81 mm | 79% |
| Apr | 18° | 6° | 94 mm | 76% |
| May | 23° | 12° | 120 mm | 78% |
| Jun | 28° | 17° | 116 mm | 74% |
| Jul | 31° | 20° | 109 mm | 68% |
| Aug | 31° | 19° | 95 mm | 68% |
| Sep | 27° | 15° | 108 mm | 70% |
| Oct | 20° | 8° | 99 mm | 76% |
| Nov | 13° | 2° | 77 mm | 79% |
| Dec | 6° | -2° | 87 mm | 84% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Manassas. Values describe typical conditions, not a forecast.
About Manassas weather
Manassas is one of many towns in Virginia's humid subtropical-to-continental climate, from the coastal plain to the Appalachian highlands, about 135 km north of Richmond. Before the rains arrive, there's warm, humid summers (June–August) with highs in the low-to-mid 30s°C. By December, expect cool winters (December–February), colder and snowier in the western mountains. This page shows live, auto-refreshing weather for Manassas: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/New_York.
Frequently asked questions
Manassas is about 135 km north of Richmond, in Virginia.
Manassas sees cool winters (December–February), colder and snowier in the western mountains.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Manassas's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Manassas, with average daytime highs of about 31°C and nights around 20°C.
The coldest nights come in January, when the average low is about -5°C and daytime highs reach around 4°C. Frost is possible on clear, calm nights.
Manassas receives about 1120 mm of rain in a typical year. May is the wettest month at roughly 120 mm, and the main rainy period is May to July and September.
April, August and October usually offer the most comfortable weather in Manassas, with mild daytime temperatures and little rain.
In November Manassas typically sees daytime highs near 13°C and lows near 2°C, with about 77 mm of rain over the month and average humidity around 79%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
Live temperature for Manassas is shown at the top of this page and refreshes automatically — see the hourly breakdown below for how it changes through the day.
Manassas's day-to-day weather follows the broader pattern of Virginia described above. See the hourly weather forecast or the air quality index for more detail.