Rio Weather in May
Average highs run from 84°F on May 1 to 87°F on May 31, and lows from 69°F to 73°F. Normal precipitation for the month is 5.66 in over about 10 wet days.
May day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
May at a glance
- Average high
- 86°F
- Average low
- 71°F
- Precipitation
- 5.66 in
- Record high
- 98°FMay 2, 1953
- Record low
- 45°FMay 4, 1971
- Chance of a freeze
- 0%
- Days of 90°F or more
- 4.7
- Daylight
- 13 h 12 min to 13 h 44 min
- Cloud cover
- 50%
- Humidity
- 75%
- Dew point
- 69°F
- Wind
- 10.1 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| May 1 | 84°F | 69°F | 96°F 1953 | 54°F 1992 | 30% |
| May 2 | 84°F | 69°F | 98°F 1953 | 55°F 1950 | 30% |
| May 3 | 85°F | 69°F | 98°F 1953 | 54°F 1971 | 30% |
| May 4 | 85°F | 70°F | 97°F 1948 | 45°F 1971 | 30% |
| May 5 | 85°F | 70°F | 94°F 1948 | 45°F 1971 | 30% |
| May 6 | 85°F | 70°F | 95°F 1952 | 50°F 1950 | 30% |
| May 7 | 85°F | 70°F | 94°F 1952 | 55°F 1950 | 31% |
| May 8 | 85°F | 70°F | 96°F 1952 | 51°F 1992 | 31% |
| May 9 | 85°F | 70°F | 95°F 1967 | 54°F 1960 | 31% |
| May 10 | 85°F | 70°F | 96°F 1986 | 52°F 1950 | 32% |
| May 11 | 85°F | 70°F | 94°F 1981 | 52°F 1950 | 32% |
| May 12 | 85°F | 70°F | 94°F 1974 | 55°F 1950 | 33% |
| May 13 | 85°F | 70°F | 96°F 1967 | 57°F 1982 | 33% |
| May 14 | 85°F | 71°F | 97°F 1938 | 52°F 1960 | 33% |
| May 15 | 86°F | 71°F | 95°F 1984 | 52°F 1960 | 34% |
| May 16 | 86°F | 71°F | 94°F 1983 | 60°F 1960 | 34% |
| May 17 | 86°F | 71°F | 92°F 1963 | 57°F 1973 | 35% |
| May 18 | 86°F | 71°F | 96°F 1944 | 56°F 1973 | 35% |
| May 19 | 86°F | 71°F | 95°F 1941 | 56°F 1951 | 36% |
| May 20 | 86°F | 71°F | 95°F 1995 | 55°F 1951 | 36% |
| May 21 | 86°F | 71°F | 97°F 1962 | 61°F 1994 | 37% |
| May 22 | 86°F | 71°F | 96°F 1962 | 58°F 1971 | 37% |
| May 23 | 86°F | 72°F | 97°F 1940 | 58°F 1972 | 38% |
| May 24 | 87°F | 72°F | 95°F 1940 | 58°F 1971 | 38% |
| May 25 | 87°F | 72°F | 96°F 1940 | 58°F 1972 | 39% |
| May 26 | 87°F | 72°F | 97°F 1949 | 58°F 1972 | 39% |
| May 27 | 87°F | 72°F | 98°F 1953 | 53°F 1967 | 40% |
| May 28 | 87°F | 72°F | 96°F 1973 | 58°F 1972 | 40% |
| May 29 | 87°F | 72°F | 97°F 2024 | 58°F 1971 | 41% |
| May 30 | 87°F | 73°F | 95°F 1945 | 59°F 1971 | 41% |
| May 31 | 87°F | 73°F | 94°F 2024 | 64°F 1941 | 42% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (EDT).
- May 1
- sunrise 6:42 AM, sunset 7:54 PM
- May 31
- sunrise 6:27 AM, sunset 8:11 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00088620 (Stuart), public domain. Records: NOAA GHCN-Daily, station USC00088620, 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.