Riverhead Weather in August
Average highs run from 84°F on August 1 to 80°F on August 31, and lows from 67°F to 64°F. Normal precipitation for the month is 3.93 in over about 8 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
- 82°F
- Average low
- 66°F
- Precipitation
- 3.93 in
- Record high
- 99°FAug 3, 2006
- Record low
- 39°FAug 31, 1965
- Chance of a freeze
- 0%
- Days of 90°F or more
- 2.4
- Daylight
- 14 h 19 min to 13 h 08 min
- Cloud cover
- 54%
- Humidity
- 78%
- Dew point
- 65°F
- Wind
- 8.5 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 | 84°F | 67°F | 93°F 2006 | 50°F 1964 | 28% | 0% |
| Aug 2 | 84°F | 67°F | 97°F 2006 | 49°F 1998 | 28% | 0% |
| Aug 3 | 84°F | 67°F | 99°F 2006 | 49°F 2025 | 28% | 0% |
| Aug 4 | 84°F | 67°F | 92°F 2006 | 48°F 1964 | 28% | 0% |
| Aug 5 | 84°F | 67°F | 93°F 2005 | 52°F 2016 | 28% | 0% |
| Aug 6 | 84°F | 67°F | 90°F 2018 | 51°F 2013 | 28% | 0% |
| Aug 7 | 83°F | 67°F | 95°F 2001 | 49°F 1964 | 28% | 0% |
| Aug 8 | 83°F | 67°F | 92°F 2001 | 45°F 2004 | 28% | 0% |
| Aug 9 | 83°F | 67°F | 95°F 2001 | 46°F 2025 | 28% | 0% |
| Aug 10 | 83°F | 67°F | 90°F 2018 | 45°F 1964 | 27% | 0% |
| Aug 11 | 83°F | 67°F | 91°F 2005 | 49°F 2019 | 27% | 0% |
| Aug 12 | 83°F | 67°F | 87°F 2005 | 46°F 1968 | 27% | 0% |
| Aug 13 | 83°F | 67°F | 91°F 2021 | 45°F 2006 | 27% | 0% |
| Aug 14 | 83°F | 66°F | 93°F 2016 | 47°F 1964 | 27% | 0% |
| Aug 15 | 83°F | 66°F | 89°F 2016 | 47°F 1964 | 27% | 0% |
| Aug 16 | 83°F | 66°F | 90°F 2018 | 50°F 1968 | 27% | 0% |
| Aug 17 | 82°F | 66°F | 90°F 2002 | 50°F 2000 | 26% | 0% |
| Aug 18 | 82°F | 66°F | 92°F 2002 | 50°F 1963 | 26% | 0% |
| Aug 19 | 82°F | 66°F | 92°F 2002 | 48°F 1963 | 26% | 0% |
| Aug 20 | 82°F | 66°F | 94°F 1955 | 44°F 2008 | 26% | 0% |
| Aug 21 | 82°F | 66°F | 88°F 1955 | 44°F 2000 | 26% | 0% |
| Aug 22 | 82°F | 66°F | 88°F 2005 | 46°F 1969 | 25% | 0% |
| Aug 23 | 82°F | 66°F | 86°F 2006 | 47°F 2016 | 25% | 0% |
| Aug 24 | 81°F | 65°F | 89°F 2021 | 46°F 2003 | 25% | 0% |
| Aug 25 | 81°F | 65°F | 90°F 2014 | 45°F 1966 | 25% | 0% |
| Aug 26 | 81°F | 65°F | 92°F 2021 | 45°F 1963 | 25% | 0% |
| Aug 27 | 81°F | 65°F | 91°F 2021 | 46°F 2017 | 25% | 0% |
| Aug 28 | 81°F | 65°F | 92°F 1959 | 48°F 2008 | 25% | 0% |
| Aug 29 | 80°F | 65°F | 96°F 1953 | 48°F 1968 | 25% | 0% |
| Aug 30 | 80°F | 65°F | 96°F 1953 | 44°F 1965 | 24% | 0% |
| Aug 31 | 80°F | 64°F | 96°F 1953 | 39°F 1965 | 24% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EDT).
- August 1
- sunrise 5:47 AM, sunset 8:06 PM
- August 31
- sunrise 6:17 AM, sunset 7:25 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00307134 (Riverhead Rsch Farm), public domain. Records: NOAA GHCN-Daily, station USW00014719, 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.