Heron Lake Weather in May
Average highs run from 62°F on May 1 to 74°F on May 31, and lows from 39°F to 53°F. Normal precipitation for the month is 4.48 in over about 14 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
- 68°F
- Average low
- 46°F
- Precipitation
- 4.48 in
- Snowfall
- 0.3 in
- Record high
- 100°FMay 28, 2018
- Record low
- 20°FMay 3, 1967
- Chance of a freeze
- 57%
- Days of 90°F or more
- 0.6
- Daylight
- 14 h 11 min to 15 h 13 min
- Cloud cover
- 65%
- Humidity
- 69%
- Dew point
- 46°F
- Wind
- 12.3 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 |
|---|---|---|---|---|---|---|
| May 1 | 62°F | 39°F | 93°F 1959 | 22°F 1909 | 40% | 4% |
| May 2 | 62°F | 39°F | 92°F 1987 | 21°F 1908 | 40% | 4% |
| May 3 | 63°F | 40°F | 92°F 1949 | 20°F 1967 | 40% | 3% |
| May 4 | 63°F | 40°F | 92°F 1952 | 22°F 1967 | 40% | 3% |
| May 5 | 63°F | 41°F | 95°F 2004 | 24°F 1944 | 41% | 3% |
| May 6 | 64°F | 41°F | 87°F 1955 | 25°F 1954 | 41% | 3% |
| May 7 | 64°F | 42°F | 90°F 1970 | 27°F 1989 | 41% | 2% |
| May 8 | 65°F | 42°F | 90°F 1918 | 28°F 1907 | 41% | 2% |
| May 9 | 65°F | 43°F | 95°F 2004 | 24°F 1945 | 42% | 2% |
| May 10 | 66°F | 43°F | 92°F 1987 | 24°F 1909 | 42% | 2% |
| May 11 | 66°F | 44°F | 93°F 1987 | 21°F 1946 | 42% | 1% |
| May 12 | 66°F | 44°F | 91°F 1940 | 25°F 1946 | 42% | 1% |
| May 13 | 67°F | 45°F | 96°F 2022 | 25°F 1918 | 42% | 1% |
| May 14 | 67°F | 45°F | 95°F 2001 | 29°F 1937 | 42% | 1% |
| May 15 | 68°F | 45°F | 98°F 2013 | 27°F 2004 | 42% | 1% |
| May 16 | 68°F | 46°F | 90°F 2026 | 31°F 1956 | 42% | 1% |
| May 17 | 68°F | 46°F | 92°F 1987 | 28°F 1915 | 43% | 1% |
| May 18 | 69°F | 47°F | 96°F 1998 | 27°F 1915 | 43% | 1% |
| May 19 | 69°F | 47°F | 96°F 2009 | 32°F 2000 | 43% | 0% |
| May 20 | 70°F | 48°F | 95°F 1975 | 27°F 1907 | 43% | 0% |
| May 21 | 70°F | 48°F | 93°F 1975 | 35°F 1947 | 44% | 0% |
| May 22 | 70°F | 49°F | 91°F 1970 | 31°F 1917 | 44% | 0% |
| May 23 | 71°F | 49°F | 91°F 1950 | 31°F 1917 | 44% | 0% |
| May 24 | 71°F | 50°F | 91°F 1939 | 32°F 1917 | 44% | 0% |
| May 25 | 72°F | 50°F | 98°F 1967 | 35°F 1954 | 44% | 0% |
| May 26 | 72°F | 51°F | 97°F 1967 | 31°F 1910 | 44% | 0% |
| May 27 | 72°F | 51°F | 95°F 2018 | 31°F 1907 | 44% | 0% |
| May 28 | 73°F | 51°F | 100°F 2018 | 31°F 1906 | 44% | 0% |
| May 29 | 73°F | 52°F | 99°F 2018 | 28°F 1947 | 44% | 0% |
| May 30 | 73°F | 52°F | 93°F 1939 | 29°F 1947 | 44% | 0% |
| May 31 | 74°F | 53°F | 92°F 1994 | 37°F 1908 | 44% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- May 1
- sunrise 6:13 AM, sunset 8:24 PM
- May 31
- sunrise 5:43 AM, sunset 8:56 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00214453 (Lakefield 2NE), public domain. Records: NOAA GHCN-Daily, station USC00219033, 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.