May is one of the warmer months of the year in Redding, with average highs near 23.9°C and lows around 9.3°C (mean 16.6°C). It is one of the drier months, averaging 54 mm of rainfall and 64% relative humidity across the period.
May is one of the warmer months of the year in Redding. Across 45 years of records, the warmest May in Redding was 2001 — when the month averaged 20.4°C — while the coldest was 1998 at 11.4°C. Typical May days reach 23.9°C with nights near 9.3°C. The long-term trend is warming, about 0.5°C per decade.
May is one of the drier months in Redding, averaging 54 mm of rainfall. The wettest May on record was 1998 with 198 mm, while the driest was 2021 at 2 mm.
Relative humidity in Redding during May averages 64%. The most humid May was 1998 at 81%, and the least humid was 2021 at 43%.
May receives about 7 kWh/m²/day of solar energy in Redding. The sunniest May was 2021 at 8.1 kWh/m²/day, and the cloudiest was 1998 at 5.3.
Average wind speed in Redding during May is 0.8 m/s. The windiest Mays were 2008, 2021 and 2022, among others at 0.9 m/s, while the calmest were 2003, 2004 and 2023, among others at 0.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.0°C | 15.7°C | 17.2°C | 16.5°C | 18.0°C | +2°C |
| Avg High | 23.5°C | 22.6°C | 24.5°C | 23.6°C | 25.9°C | +2.4°C |
| Avg Low | 8.4°C | 8.8°C | 10.0°C | 9.5°C | 10.1°C | +1.7°C |
| Avg Rain | 35 mm | 85 mm | 55 mm | 48 mm | 43 mm | +8 mm |
May temperatures in Redding have risen by about 2.1°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -0.7°C (1988) to a record high of 40.6°C (2021).
Rainfall in May is one of the drier months, averaging 54 mm, with a wettest year of 198 mm.
A good time to visit Redding
May is a good time to visit Redding, with days averaging 23.9°C and nights around 9.3°C (mean 16.6°C, warmer than Redding's yearly average) and moderate rainfall. June and September are marginally more temperate, but May still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 26.7°C | 18.7°C | 10.7°C | 39.1°C | 6.1°C | 15 mm | 58% | 0.8 m/s | 7.9 |
| 2024 | 25.8°C | 17.6°C | 9.4°C | 34.0°C | 1.7°C | 43 mm | 60% | 0.8 m/s | 7.9 |
| 2023 | 24.3°C | 18.0°C | 11.8°C | 32.2°C | 5.7°C | 59 mm | 69% | 0.7 m/s | 6.8 |
| 2022 | 24.5°C | 16.3°C | 8.1°C | 35.8°C | 0.3°C | 13 mm | 56% | 0.9 m/s | 7.1 |
| 2021 | 29.2°C | 20.0°C | 10.8°C | 40.6°C | 5.4°C | 2 mm | 43% | 0.9 m/s | 8.1 |
| 2020 | 24.8°C | 17.4°C | 10.0°C | 35.0°C | 3.1°C | 123 mm | 62% | 0.8 m/s | 6.6 |
| 2019 | 22.1°C | 15.9°C | 9.8°C | 29.1°C | 5.2°C | 136 mm | 72% | 0.8 m/s | 6.6 |
| 2018 | 25.2°C | 18.3°C | 11.4°C | 33.3°C | 5.0°C | 35 mm | 64% | 0.8 m/s | 7.3 |
| 2017 | 25.0°C | 17.6°C | 10.3°C | 34.1°C | 2.3°C | 13 mm | 65% | 0.8 m/s | 7.6 |
| 2016 | 24.1°C | 17.4°C | 10.6°C | 35.5°C | 6.6°C | 55 mm | 67% | 0.8 m/s | 6.8 |
| 2015 | 25.3°C | 18.3°C | 11.4°C | 31.4°C | 6.9°C | 28 mm | 55% | 0.8 m/s | 7.1 |
| 2014 | 26.5°C | 18.2°C | 9.9°C | 33.0°C | 4.3°C | 11 mm | 54% | 0.8 m/s | 7.7 |
| 2013 | 26.1°C | 18.0°C | 9.9°C | 33.3°C | 2.4°C | 23 mm | 55% | 0.8 m/s | 7.4 |
| 2012 | 24.7°C | 16.7°C | 8.7°C | 34.3°C | 2.5°C | 15 mm | 62% | 0.8 m/s | 7.6 |
| 2011 | 19.0°C | 12.9°C | 6.7°C | 28.1°C | 2.6°C | 99 mm | 72% | 0.8 m/s | 6.3 |
| 2010 | 18.3°C | 12.0°C | 5.8°C | 25.1°C | 1.4°C | 69 mm | 73% | 0.8 m/s | 6.4 |
| 2009 | 25.6°C | 18.1°C | 10.6°C | 34.5°C | 4.5°C | 98 mm | 64% | 0.8 m/s | 7.2 |
| 2008 | 25.6°C | 17.7°C | 9.9°C | 37.7°C | 1.9°C | 24 mm | 56% | 0.9 m/s | 7.1 |
| 2007 | 26.6°C | 18.5°C | 10.4°C | 33.4°C | 3.2°C | 22 mm | 55% | 0.8 m/s | 7.7 |
| 2006 | 23.9°C | 17.4°C | 10.9°C | 33.3°C | 5.5°C | 39 mm | 70% | 0.8 m/s | 7 |
| 2005 | 21.2°C | 15.6°C | 10.0°C | 30.8°C | 4.5°C | 192 mm | 76% | 0.8 m/s | 6.1 |
| 2004 | 24.9°C | 17.3°C | 9.7°C | 32.8°C | 4.8°C | 33 mm | 62% | 0.7 m/s | 7.4 |
| 2003 | 22.0°C | 15.6°C | 9.2°C | 31.9°C | 2.3°C | 39 mm | 72% | 0.7 m/s | 6.9 |
| 2002 | 23.6°C | 16.4°C | 9.1°C | 34.4°C | 3.7°C | 41 mm | 62% | 0.8 m/s | 7.4 |
| 2001 🔥 | 29.3°C | 20.4°C | 11.5°C | 38.3°C | 4.1°C | 7 mm | 52% | 0.9 m/s | 7.9 |
| 2000 | 22.5°C | 15.5°C | 8.6°C | 34.0°C | 2.5°C | 49 mm | 71% | 0.8 m/s | 6.6 |
| 1999 | 23.6°C | 15.8°C | 8.0°C | 32.2°C | 1.2°C | 10 mm | 63% | 0.8 m/s | 7.8 |
| 1998 ❄️ 🌧️ | 16.4°C | 11.4°C | 6.5°C | 23.9°C | 2.2°C | 198 mm | 81% | 0.8 m/s | 5.3 |
| 1997 | 27.9°C | 19.8°C | 11.7°C | 34.0°C | 1.3°C | 21 mm | 57% | 0.7 m/s | 7.5 |
| 1996 | 21.8°C | 14.8°C | 7.8°C | 31.5°C | 2.8°C | 127 mm | 71% | 0.8 m/s | 6.9 |
| 1995 | 20.9°C | 15.1°C | 9.3°C | 28.6°C | 2.3°C | 52 mm | 74% | 0.7 m/s | 6.4 |
| 1994 | 23.7°C | 16.7°C | 9.8°C | 33.2°C | 4.6°C | 66 mm | 68% | 0.7 m/s | 6.1 |
| 1993 | 20.0°C | 14.3°C | 8.6°C | 26.2°C | 2.4°C | 137 mm | 77% | 0.9 m/s | 5.7 |
| 1992 | 28.1°C | 20.0°C | 11.9°C | 34.9°C | 5.3°C | 10 mm | 60% | 0.7 m/s | 7.5 |
| 1991 | 20.5°C | 13.5°C | 6.4°C | 28.2°C | 2.5°C | 41 mm | 69% | 0.8 m/s | 6.3 |
| 1990 | 22.8°C | 15.4°C | 8.1°C | 32.3°C | 3.1°C | 188 mm | 61% | 0.9 m/s | 6 |
| 1989 | 22.2°C | 15.1°C | 8.0°C | 29.1°C | 3.6°C | 30 mm | 69% | 0.8 m/s | 6.9 |
| 1988 | 21.8°C | 14.4°C | 7.1°C | 30.8°C | -0.7°C | 87 mm | 64% | 0.8 m/s | 6.6 |
| 1987 | 26.9°C | 18.8°C | 10.7°C | 34.2°C | 5.0°C | 12 mm | 56% | 0.8 m/s | 6.8 |
| 1986 | 22.9°C | 15.5°C | 8.1°C | 34.3°C | 1.3°C | 58 mm | 67% | 0.8 m/s | 6.8 |
| 1985 | 24.0°C | 16.0°C | 7.9°C | 30.9°C | 3.3°C | 22 mm | 55% | 0.8 m/s | 7.3 |
| 1984 | 24.0°C | 16.1°C | 8.1°C | 36.2°C | 2.2°C | 17 mm | 62% | 0.9 m/s | 6.8 |
| 1983 | 22.7°C | 16.0°C | 9.4°C | 31.6°C | -0.3°C | 27 mm | 71% | 0.8 m/s | — |
| 1982 | 24.4°C | 16.6°C | 8.8°C | 35.0°C | 3.5°C | 4 mm | 63% | 0.8 m/s | — |
| 1981 | 23.0°C | 15.4°C | 7.8°C | 32.7°C | 1.0°C | 58 mm | 67% | 0.8 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 23.9°C with lows near 9.3°C (mean 16.6°C), based on 45 years of NASA POWER data.
May averages 54 mm of rainfall in Redding, one of the drier months. The wettest on record was 198 mm in 1998.
The hottest May reached 40.6°C in 2021. The coldest dipped to -0.7°C in 1988.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 2.1°C. Daytime highs moved from 23.6°C to 26.1°C and overnight lows from 8.4°C to 10.2°C over the same span.
May is one of the warmer months of the year in Redding and one of the drier months, so plan for around 23.9°C daytime highs and 9.3°C at night.
Not quite — May is the 7th coolest month in Redding, averaging 16.6°C.
For May in Redding, pack light layers you can adjust through the day, with typical highs of 23.9°C and lows of 9.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 64% — moderately humid.
Average wind speed in May is 0.8 m/s. The windiest May on record averaged 0.9 m/s (1984).
The wettest May on record was 1998 with 198 mm. On average, May sees 54 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Redding behaves each May, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for May specifically, along with year-by-year records and how the month has changed over the decades.
