# Hourly Weather Location: Herndon, 20170, Virginia, United States · as of 9:18 p.m. EDT ## Tomorrow's maximum UV index will be a little higher than today's ### Friday, August 14 | Time | Temperature | Condition | Rain Probability | Humidity | Wind | Precipitation | |--------|-------------|------------------|------------------|----------|------------|---------------| | 21:15 | 77° | Mostly Cloudy | 2% | 81% | 4 mph | 0 in | | 21:30 | 76° | Mostly Cloudy | 2% | 82% | 4 mph | 0 in | | 21:45 | 76° | Mostly Cloudy | 7% | 83% | 4 mph | 0 in | | 22:00 | 76° | Partly Cloudy | 6% | 84% | 4 mph | 0 in | | 22:15 | 75° | Partly Cloudy | 4% | 85% | 4 mph | 0 in | | 23:00 | 75° | Partly Cloudy | 2% | 88% | 4 mph | 0 in | ### Saturday, August 15 | Time | Temperature | Condition | Rain Probability | Humidity | Wind | Precipitation | |--------|-------------|------------------|------------------|----------|------------|---------------| | 00:00 | 74° | Partly Cloudy | 3% | 90% | 4 mph | 0 in | | 01:00 | 73° | Partly Cloudy | 3% | 94% | 3 mph | 0 in | | 02:00 | 72° | Partly Cloudy | 3% | 97% | 3 mph | 0 in | | 03:00 | 72° | Partly Cloudy | 3% | 97% | 3 mph | 0 in | | 04:00 | 71° | Partly Cloudy | 5% | 97% | 4 mph | 0 in | | 05:00 | 70° | Partly Cloudy | 8% | 96% | 4 mph | 0 in | | 06:00 | 70° | Partly Cloudy | 7% | 94% | 4 mph | 0 in | | 07:00 | 70° | Partly Cloudy | 7% | 94% | 4 mph | 0 in | | 08:00 | 73° | Partly Cloudy | 6% | 85% | 4 mph | 0 in | | 09:00 | 75° | Partly Cloudy | 4% | 78% | 5 mph | 0 in | | 10:00 | 78° | Mostly Clear | 2% | 70% | 4 mph | 0 in | | 11:00 | 81° | Mostly Clear | 1% | 62% | 4 mph | 0 in | | 12:00 | 83° | Partly Cloudy | 1% | 58% | 4 mph | 0 in | | 13:00 | 84° | Partly Cloudy | 3% | 56% | 4 mph | 0 in | | 14:00 | 85° | Partly Cloudy | 2% | 54% | 4 mph | 0 in | | 15:00 | 86° | Partly Cloudy | 0% | 54% | 4 mph | 0 in | | 16:00 | 86° | Mostly Cloudy | 0% | 53% | 4 mph | 0 in | | 17:00 | 85° | Partly Cloudy | 0% | 55% | 5 mph | 0 in | | 18:00 | 84° | Mostly Cloudy | 0% | 55% | 5 mph | 0 in | | 19:00 | 83° | Mostly Cloudy | 1% | 59% | 6 mph | 0 in | | 20:00 | 80° | Mostly Cloudy | 1% | 64% | 4 mph | 0 in | | 21:00 | 79° | Mostly Cloudy | 2% | 67% | 3 mph | 0 in | | 22:00 | 77° | Mostly Cloudy | 2% | 73% | 4 mph | 0 in | | 23:00 | 76° | Mostly Cloudy | 5% | 77% | 5 mph | 0 in | ### Sunday, August 16 | Time | Temperature | Condition | Rain Probability | Humidity | Wind | Precipitation | |--------|-------------|------------------|------------------|----------|------------|---------------| | 00:00 | 76° | Cloudy | 8% | 80% | 4 mph | 0 in | | 01:00 | 75° | Cloudy | 10% | 84% | 4 mph | 0 in | | 02:00 | 75° | Mostly Cloudy | 15% | 85% | 5 mph | 0 in | | 03:00 | 75° | Mostly Cloudy | 8% | 88% | 5 mph | 0 in | | 04:00 | 75° | Mostly Cloudy | 13% | 88% | 5 mph | 0 in | | 05:00 | 74° | Cloudy | 10% | 89% | 5 mph | 0 in | | 06:00 | 74° | Cloudy | 23% | 90% | 6 mph | 0 in | | 07:00 | 74° | Showers | 32% | 92% | 6 mph | 0.01 in | | 08:00 | 75° | Rain | 60% | 91% | 8 mph | 0.04 in | | 09:00 | 75° | Showers | 58% | 89% | 9 mph | 0.02 in | | 10:00 | 76° | Thunderstorms | 76% | 88% | 9 mph | 0.04 in | | 11:00 | 76° | Thunderstorms | 66% | 90% | 10 mph | 0.04 in | | 12:00 | 77° | Thunderstorms | 62% | 90% | 10 mph | 0.05 in | | 13:00 | 76° | Thunderstorms | 90% | 94% | 11 mph | 0.13 in | | 14:00 | 77° | Scattered Thunderstorms | 59% | 95% | 10 mph | 0.04 in | | 15:00 | 79° | Scattered Thunderstorms | 59% | 86% | 9 mph | 0.03 in | | 16:00 | 80° | Thunderstorms | 81% | 84% | 8 mph | 0.05 in | | 17:00 | 80° | Thunderstorms | 80% | 88% | 9 mph | 0.12 in | | 18:00 | 81° | Scattered Thunderstorms | 53% | 85% | 8 mph | 0.05 in | | 19:00 | 80° | Scattered Thunderstorms | 38% | 85% | 9 mph | 0.01 in | | 20:00 | 79° | Mostly Cloudy | 24% | 90% | 7 mph | 0 in | | 21:00 | 78° | Scattered Thunderstorms Night | 35% | 91% | 6 mph | 0.01 in | ## Air Quality Index 61 - Moderate Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution. ## Health & Activities - Grass pollen is moderate in your area - Flu risk is very low in your area