Adelphi Weather in August
Average highs run from 87°F on August 1 to 84°F on August 31, and lows from 67°F to 64°F. Normal precipitation for the month is 3.88 in over about 9 wet days.
August day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
August at a glance
- Average high
- 86°F
- Average low
- 66°F
- Precipitation
- 3.88 in
- Record high
- 102°FAug 1, 1954
- Record low
- 38°FAug 29, 1982
- Chance of a freeze
- 0%
- Days of 90°F or more
- 7.8
- Daylight
- 14 h 10 min to 13 h 04 min
- Cloud cover
- 55%
- Humidity
- 69%
- Dew point
- 64°F
- Wind
- 6.7 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Aug 1 | 87°F | 67°F | 102°F 1954 | 52°F 1966 | 32% | 0% |
| Aug 2 | 87°F | 67°F | 98°F 1999 | 52°F 1947 | 32% | 0% |
| Aug 3 | 86°F | 67°F | 100°F 1955 | 48°F 1959 | 32% | 0% |
| Aug 4 | 86°F | 67°F | 98°F 1991 | 50°F 1985 | 32% | 0% |
| Aug 5 | 86°F | 67°F | 98°F 1987 | 48°F 1951 | 32% | 0% |
| Aug 6 | 86°F | 67°F | 95°F 1955 | 47°F 1951 | 32% | 0% |
| Aug 7 | 86°F | 67°F | 99°F 1955 | 51°F 1964 | 32% | 0% |
| Aug 8 | 86°F | 67°F | 96°F 2007 | 50°F 1950 | 32% | 0% |
| Aug 9 | 86°F | 67°F | 101°F 2007 | 50°F 1989 | 32% | 0% |
| Aug 10 | 86°F | 67°F | 98°F 1943 | 53°F 1964 | 32% | 0% |
| Aug 11 | 86°F | 67°F | 97°F 2010 | 47°F 1972 | 31% | 0% |
| Aug 12 | 86°F | 67°F | 97°F 1949 | 49°F 1962 | 31% | 0% |
| Aug 13 | 86°F | 67°F | 96°F 2002 | 48°F 1950 | 31% | 0% |
| Aug 14 | 86°F | 67°F | 100°F 1943 | 44°F 1941 | 31% | 0% |
| Aug 15 | 86°F | 66°F | 97°F 1985 | 44°F 1964 | 31% | 0% |
| Aug 16 | 86°F | 66°F | 101°F 1988 | 50°F 1972 | 31% | 0% |
| Aug 17 | 86°F | 66°F | 101°F 1997 | 47°F 1979 | 31% | 0% |
| Aug 18 | 86°F | 66°F | 102°F 1997 | 46°F 1981 | 30% | 0% |
| Aug 19 | 86°F | 66°F | 95°F 1956 | 47°F 1953 | 30% | 0% |
| Aug 20 | 86°F | 66°F | 95°F 2002 | 46°F 1964 | 30% | 0% |
| Aug 21 | 85°F | 66°F | 102°F 1983 | 49°F 1953 | 30% | 0% |
| Aug 22 | 85°F | 66°F | 94°F 1951 | 48°F 1956 | 29% | 0% |
| Aug 23 | 85°F | 66°F | 98°F 1983 | 46°F 1952 | 29% | 0% |
| Aug 24 | 85°F | 65°F | 95°F 1968 | 43°F 1952 | 29% | 0% |
| Aug 25 | 85°F | 65°F | 97°F 1943 | 46°F 1944 | 29% | 0% |
| Aug 26 | 85°F | 65°F | 98°F 2007 | 42°F 1942 | 28% | 0% |
| Aug 27 | 85°F | 65°F | 97°F 1948 | 44°F 1945 | 28% | 0% |
| Aug 28 | 85°F | 65°F | 98°F 1948 | 47°F 1942 | 28% | 0% |
| Aug 29 | 84°F | 65°F | 99°F 1948 | 38°F 1982 | 28% | 0% |
| Aug 30 | 84°F | 64°F | 98°F 1953 | 41°F 1986 | 28% | 0% |
| Aug 31 | 84°F | 64°F | 100°F 1953 | 42°F 1946 | 28% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EDT).
- August 1
- sunrise 6:09 AM, sunset 8:19 PM
- August 31
- sunrise 6:36 AM, sunset 7:40 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00180700 (Beltsville), public domain. Records: NOAA GHCN-Daily, station USC00180700, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.