April is one of the cooler months of the year in Stillwater, with average highs near 21.9°C and lows around 8.7°C (mean 15.3°C). It is a relatively wet time of year, averaging 98 mm of rainfall and 68% relative humidity across the period.
April is one of the cooler months of the year in Stillwater. Across 45 years of records, the warmest April in Stillwater was 1981 — when the month averaged 20.3°C — while the coldest were 1983 and 2018 at 11.8°C. Typical April days reach 21.9°C with nights near 8.7°C. The long-term trend is warming, about 0.3°C per decade.
April is a relatively wet time of year in Stillwater, averaging 98 mm of rainfall. The wettest April on record was 2017 with 260 mm, while the driest was 1989 at 6 mm.
Relative humidity in Stillwater during April averages 68%. The most humid April was 1985 at 78%, and the least humid was 1996 at 50%.
April receives about 5.5 kWh/m²/day of solar energy in Stillwater. The sunniest April was 1987 at 6.3 kWh/m²/day, and the cloudiest were 1993 and 2013 at 4.8.
Average wind speed in Stillwater during April is 3.9 m/s. The windiest April was 2022 at 4.6 m/s, while the calmest was 1987 at 2.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.0°C | 14.3°C | 15.8°C | 15.9°C | 15.7°C | +0.7°C |
| Avg High | 21.6°C | 21.0°C | 22.5°C | 22.4°C | 22.3°C | +0.7°C |
| Avg Low | 8.2°C | 7.7°C | 9.2°C | 9.4°C | 9.2°C | +1°C |
| Avg Rain | 69 mm | 122 mm | 81 mm | 113 mm | 105 mm | +36 mm |
April temperatures in Stillwater have risen by about 1.2°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -4.3°C (1997) to a record high of 37.9°C (2006).
Rainfall in April is a relatively wet time of year, averaging 98 mm, with a wettest year of 260 mm.
A good time to visit Stillwater
April is a good time to visit Stillwater, with days averaging 21.9°C and nights around 8.7°C (mean 15.3°C, close to Stillwater's yearly average) and higher rainfall. September and May are marginally more temperate, but April still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 22.8°C | 16.7°C | 10.6°C | 31.2°C | 0.3°C | 254 mm | 71% | 3.8 m/s | 5.1 |
| 2024 | 24.2°C | 17.6°C | 11.1°C | 32.3°C | 3.0°C | 94 mm | 62% | 4.2 m/s | 5.8 |
| 2023 | 22.1°C | 15.3°C | 8.5°C | 30.0°C | 2.0°C | 84 mm | 61% | 3.8 m/s | 5.9 |
| 2022 | 23.4°C | 16.3°C | 9.3°C | 32.2°C | 0.6°C | 43 mm | 60% | 4.6 m/s | 5.9 |
| 2021 | 21.2°C | 14.4°C | 7.7°C | 27.5°C | -0.7°C | 96 mm | 67% | 3.8 m/s | 5.4 |
| 2020 | 20.4°C | 14.0°C | 7.7°C | 29.5°C | -1.3°C | 59 mm | 74% | 3.5 m/s | 5.7 |
| 2019 | 22.6°C | 16.3°C | 10.0°C | 29.4°C | 0.6°C | 123 mm | 73% | 3.7 m/s | 5.5 |
| 2018 | 18.9°C | 11.8°C | 4.6°C | 29.2°C | -4.0°C | 59 mm | 63% | 4.2 m/s | 5.8 |
| 2017 🌧️ | 22.2°C | 16.3°C | 10.4°C | 28.2°C | 3.9°C | 260 mm | 74% | 3.8 m/s | 5 |
| 2016 | 22.9°C | 16.5°C | 10.2°C | 28.2°C | -0.2°C | 141 mm | 70% | 3.5 m/s | 5.8 |
| 2015 | 22.6°C | 16.7°C | 10.8°C | 30.8°C | 1.5°C | 110 mm | 70% | 3.6 m/s | 5.3 |
| 2014 | 23.4°C | 15.9°C | 8.4°C | 30.4°C | -1.2°C | 34 mm | 56% | 4.2 m/s | 6 |
| 2013 | 19.5°C | 12.8°C | 6.0°C | 29.8°C | -3.3°C | 133 mm | 71% | 4 m/s | 4.8 |
| 2012 | 24.4°C | 18.5°C | 12.5°C | 31.5°C | 5.3°C | 121 mm | 74% | 3.6 m/s | 5.5 |
| 2011 | 25.3°C | 17.8°C | 10.3°C | 34.5°C | 2.8°C | 76 mm | 53% | 4.5 m/s | 5.7 |
| 2010 | 22.4°C | 16.4°C | 10.3°C | 28.2°C | 1.2°C | 74 mm | 71% | 4.3 m/s | 5.6 |
| 2009 | 21.3°C | 14.8°C | 8.3°C | 31.3°C | -4.3°C | 122 mm | 67% | 4.2 m/s | 5.1 |
| 2008 | 20.3°C | 13.7°C | 7.1°C | 27.8°C | -0.5°C | 139 mm | 73% | 4.1 m/s | 5.9 |
| 2007 | 19.2°C | 13.0°C | 6.8°C | 27.0°C | -3.9°C | 71 mm | 72% | 3.5 m/s | 5.3 |
| 2006 | 27.4°C | 19.7°C | 12.0°C | 37.9°C | 2.9°C | 118 mm | 54% | 4.1 m/s | 5.9 |
| 2005 | 22.2°C | 15.6°C | 9.1°C | 29.2°C | 2.5°C | 15 mm | 66% | 3.9 m/s | 5.9 |
| 2004 | 22.0°C | 15.6°C | 9.3°C | 29.2°C | 1.6°C | 83 mm | 72% | 3.5 m/s | 5.4 |
| 2003 | 23.4°C | 16.2°C | 9.0°C | 30.3°C | -3.2°C | 48 mm | 64% | 4.3 m/s | 6 |
| 2002 | 22.9°C | 16.6°C | 10.4°C | 31.3°C | -0.8°C | 95 mm | 73% | 3.8 m/s | 5 |
| 2001 | 23.9°C | 17.7°C | 11.6°C | 28.2°C | 1.4°C | 31 mm | 70% | 4.3 m/s | 5.4 |
| 2000 | 22.1°C | 15.2°C | 8.2°C | 30.8°C | -0.3°C | 84 mm | 65% | 3.7 m/s | 5.6 |
| 1999 | 21.7°C | 15.4°C | 9.1°C | 28.6°C | 1.1°C | 170 mm | 72% | 3.9 m/s | 5.3 |
| 1998 | 19.4°C | 13.1°C | 6.8°C | 28.2°C | 2.3°C | 115 mm | 72% | 3.7 m/s | 5.7 |
| 1997 | 18.9°C | 12.6°C | 6.2°C | 27.0°C | -4.3°C | 125 mm | 72% | 3.7 m/s | 4.9 |
| 1996 | 22.8°C | 14.6°C | 6.5°C | 29.4°C | -1.6°C | 44 mm | 50% | 4.4 m/s | 5.8 |
| 1995 | 20.8°C | 14.1°C | 7.3°C | 29.5°C | 0.5°C | 143 mm | 72% | 3.8 m/s | 5.1 |
| 1994 | 22.0°C | 14.9°C | 7.9°C | 28.7°C | -2.7°C | 154 mm | 71% | 4 m/s | 4.9 |
| 1993 | 18.8°C | 12.5°C | 6.3°C | 26.2°C | -0.1°C | 135 mm | 77% | 3.6 m/s | 4.8 |
| 1992 | 21.5°C | 15.3°C | 9.1°C | 28.0°C | -0.6°C | 94 mm | 76% | 3.2 m/s | 5.3 |
| 1991 | 24.2°C | 17.3°C | 10.3°C | 29.6°C | 4.4°C | 78 mm | 66% | 3.6 m/s | 5.1 |
| 1990 | 19.7°C | 13.6°C | 7.4°C | 27.1°C | -1.1°C | 161 mm | 77% | 3.6 m/s | 5.2 |
| 1989 | 22.7°C | 16.0°C | 9.3°C | 31.4°C | -2.2°C | 6 mm | 65% | 3.5 m/s | 6.1 |
| 1988 | 20.3°C | 13.4°C | 6.5°C | 26.4°C | 1.6°C | 99 mm | 72% | 3.4 m/s | 5.4 |
| 1987 | 21.6°C | 14.3°C | 7.0°C | 30.4°C | -3.0°C | 20 mm | 71% | 2.9 m/s | 6.3 |
| 1986 | 22.6°C | 16.3°C | 10.0°C | 29.1°C | 1.9°C | 105 mm | 71% | 3.9 m/s | 5.8 |
| 1985 | 21.9°C | 16.0°C | 10.0°C | 26.9°C | 0.6°C | 148 mm | 78% | 3.3 m/s | 6 |
| 1984 | 19.5°C | 12.9°C | 6.2°C | 28.3°C | -0.6°C | 74 mm | 71% | 4.1 m/s | 5.2 |
| 1983 ❄️ | 18.2°C | 11.8°C | 5.4°C | 28.1°C | -1.2°C | 72 mm | 73% | 4 m/s | — |
| 1982 | 20.5°C | 13.6°C | 6.7°C | 32.1°C | -2.3°C | 53 mm | 66% | 3.9 m/s | — |
| 1981 🔥 | 27.4°C | 20.3°C | 13.1°C | 33.3°C | 3.9°C | 38 mm | 57% | 4.3 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 21.9°C with lows near 8.7°C (mean 15.3°C), based on 45 years of NASA POWER data.
April averages 98 mm of rainfall in Stillwater, a relatively wet time of year. The wettest on record was 260 mm in 2017.
The hottest April reached 37.9°C in 2006. The coldest dipped to -4.3°C in 1997.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.2°C. Daytime highs moved from 21.5°C to 22.7°C and overnight lows from 8.3°C to 9.4°C over the same span.
April is one of the cooler months of the year in Stillwater and a relatively wet time of year, so plan for around 21.9°C daytime highs and 8.7°C at night.
Not quite — April is the 6th coolest month in Stillwater, averaging 15.3°C.
For April in Stillwater, pack light layers you can adjust through the day, with typical highs of 21.9°C and lows of 8.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 68% — moderately humid.
Average wind speed in April is 3.9 m/s. The windiest April on record averaged 4.6 m/s (2022).
The wettest April on record was 2017 with 260 mm. On average, April sees 98 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 Stillwater behaves each April, 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 April specifically, along with year-by-year records and how the month has changed over the decades.
