May weather in St. Helens, OR
The average temperature in St. Helens in May is 56.3°F (46.1°F–66.6°F). Average precipitation: inches.
May is a spring month in St. Helens, and is warmer than the annual average of 51.6°F. Daily temperatures swing about 20.5°F between overnight low and afternoon high. Daylight averages about 14h 44m. For travel, May is a comfortable month to visit.
Avg High
66.6°F
Avg Low
46.1°F
Precipitation
in
Daylight
14h 44m
May records in St. Helens
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 84.9°F (2004) | 28.0°F (2000) | 0.90 in (1984) |
| May 2 | 82.0°F (1998) | 36.0°F (1997) | 1.30 in (2012) |
| May 3 | 89.1°F (1992) | 33.1°F (1997) | 0.56 in (1999) |
| May 4 | 90.0°F (1992) | 17.1°F (1999) | 0.92 in (2009) |
| May 5 | 91.9°F (1992) | 27.0°F (2003) | 1.31 in (1979) |
| May 6 | 91.9°F (1987) | 17.1°F (1999) | 0.85 in (2009) |
| May 7 | 93.0°F (1987) | 30.0°F (1999) | 0.42 in (2004) |
| May 8 | 91.9°F (1987) | 30.9°F (2003) | 0.62 in (1983) |
| May 9 | 91.0°F (1987) | 28.0°F (1999) | 0.98 in (2014) |
| May 10 | 89.1°F (1994) | 28.9°F (2000) | 0.91 in (2005) |
| May 11 | 93.9°F (1997) | 33.1°F (1985) | 0.89 in (1995) |
| May 12 | 95.0°F (1997) | 30.0°F (2004) | 1.07 in (1987) |
| May 13 | 89.1°F (1997) | 33.1°F (2000) | 1.00 in (1978) |
| May 14 | 88.0°F (1995) | 30.9°F (2003) | 0.70 in (1978) |
| May 15 | 86.0°F (1995) | 33.1°F (1986) | 0.71 in (2011) |
| May 16 | 96.1°F (2008) | 28.0°F (1988) | 0.32 in (1977) |
| May 17 | 91.9°F (1992) | 28.0°F (1988) | 0.88 in (1998) |
| May 18 | 84.0°F (1997) | 28.9°F (1999) | 1.00 in (1996) |
| May 19 | 89.1°F (1997) | 39.0°F (1982) | 0.92 in (2014) |
| May 20 | 84.0°F (1978) | 34.0°F (2003) | 0.94 in (1986) |
| May 21 | 91.9°F (1988) | 39.9°F (1986) | 0.66 in (2012) |
| May 22 | 97.0°F (2001) | 37.9°F (1999) | 1.10 in (2013) |
| May 23 | 98.1°F (2001) | 37.9°F (2011) | 0.65 in (2013) |
| May 24 | 97.0°F (1992) | 35.1°F (2004) | 0.60 in (1998) |
| May 25 | 87.1°F (1979) | 18.0°F (2005) | 0.72 in (1984) |
| May 26 | 98.1°F (2005) | 24.1°F (2004) | 0.45 in (1977) |
| May 27 | 100.0°F (2005) | 21.0°F (2004) | 0.88 in (2004) |
| May 28 | 102.0°F (1983) | 28.9°F (2001) | 0.75 in (2000) |
| May 29 | 91.9°F (2005) | 27.0°F (2003) | 0.60 in (1997) |
| May 30 | 91.9°F (1994) | 37.9°F (1988) | 0.74 in (1987) |
| May 31 | 97.0°F (2001) | 42.1°F (1984) | 0.78 in (1977) |