August is one of the warmer months of the year in Kalispell, with average highs near 25.8°C and lows around 11.4°C (mean 18.6°C). It is one of the drier months, averaging 35 mm of rainfall and 52% relative humidity across the period.
August is one of the warmer months of the year in Kalispell. Across 45 years of records, the warmest August in Kalispell was 2022 — when the month averaged 21.8°C — while the coldest was 1993 at 15.1°C. Typical August days reach 25.8°C with nights near 11.4°C. The long-term trend is warming, about 0.4°C per decade.
August is one of the drier months in Kalispell, averaging 35 mm of rainfall. The wettest August on record was 1989 with 97 mm, while the driest was 2001 at 3 mm.
Relative humidity in Kalispell during August averages 52%. The most humid August was 1993 at 65%, and the least humid was 2001 at 40%.
August receives about 5.7 kWh/m²/day of solar energy in Kalispell. The sunniest August was 2011 at 6.5 kWh/m²/day, and the cloudiest were 1989 and 2021 at 4.9.
Average wind speed in Kalispell during August is 0.6 m/s. The windiest Augusts were 1996, 2000 and 2007, among others at 0.7 m/s, while the calmest were 1981 and 2025 at 0.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.1°C | 18.1°C | 18.5°C | 19.0°C | 19.8°C | +1.7°C |
| Avg High | 25.3°C | 25.1°C | 25.9°C | 26.1°C | 26.8°C | +1.5°C |
| Avg Low | 11.0°C | 11.0°C | 11.1°C | 11.8°C | 12.8°C | +1.8°C |
| Avg Rain | 40 mm | 33 mm | 30 mm | 29 mm | 47 mm | +7 mm |
August temperatures in Kalispell have risen by about 1.2°C between 1981–1985 and 2021–2025.
August has ranged from a record low of -1.6°C (1992) to a record high of 37.2°C (2018).
Rainfall in August is one of the drier months, averaging 35 mm, with a wettest year of 97 mm.
One of the best times to visit Kalispell
August is one of the best times to visit Kalispell. Expect days averaging 25.8°C and nights around 11.4°C (mean 18.6°C) — warmer than Kalispell's yearly average — with moderate rainfall (35 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 26.6°C | 20.0°C | 13.4°C | 32.0°C | 8.3°C | 47 mm | 56% | 0.5 m/s | 5.4 |
| 2024 | 26.1°C | 19.1°C | 12.0°C | 34.2°C | 5.3°C | 59 mm | 55% | 0.6 m/s | 5.2 |
| 2023 | 27.0°C | 20.2°C | 13.5°C | 35.8°C | 8.0°C | 91 mm | 52% | 0.6 m/s | 5.5 |
| 2022 🔥 | 29.2°C | 21.8°C | 14.5°C | 34.9°C | 8.2°C | 20 mm | 48% | 0.6 m/s | 6.1 |
| 2021 | 25.3°C | 18.4°C | 11.5°C | 33.1°C | 5.0°C | 52 mm | 53% | 0.6 m/s | 4.9 |
| 2020 | 26.6°C | 19.3°C | 11.9°C | 33.3°C | 5.5°C | 16 mm | 47% | 0.6 m/s | 6.1 |
| 2019 | 26.3°C | 19.3°C | 12.3°C | 32.9°C | 8.2°C | 37 mm | 50% | 0.6 m/s | 5.6 |
| 2018 | 25.9°C | 18.7°C | 11.6°C | 37.2°C | 3.1°C | 10 mm | 48% | 0.6 m/s | 5.5 |
| 2017 | 27.9°C | 20.1°C | 12.3°C | 33.0°C | 9.0°C | 15 mm | 45% | 0.6 m/s | 5.7 |
| 2016 | 25.5°C | 18.3°C | 11.1°C | 33.0°C | 6.0°C | 26 mm | 52% | 0.6 m/s | 5.6 |
| 2015 | 27.4°C | 19.9°C | 12.4°C | 35.0°C | 3.3°C | 12 mm | 44% | 0.6 m/s | 5.3 |
| 2014 | 25.0°C | 18.5°C | 12.0°C | 32.0°C | 5.2°C | 62 mm | 61% | 0.6 m/s | 5.3 |
| 2013 | 27.1°C | 20.0°C | 12.9°C | 31.6°C | 10.0°C | 45 mm | 54% | 0.6 m/s | 5.7 |
| 2012 | 27.0°C | 19.2°C | 11.5°C | 31.3°C | 6.2°C | 20 mm | 52% | 0.6 m/s | 6.4 |
| 2011 | 26.0°C | 19.0°C | 12.0°C | 31.0°C | 6.5°C | 11 mm | 52% | 0.6 m/s | 6.5 |
| 2010 | 23.3°C | 16.6°C | 9.9°C | 32.1°C | 4.1°C | 49 mm | 59% | 0.6 m/s | 5.6 |
| 2009 | 24.9°C | 17.9°C | 10.9°C | 31.7°C | 6.1°C | 48 mm | 56% | 0.6 m/s | 5.6 |
| 2008 | 24.8°C | 17.4°C | 10.1°C | 34.7°C | 4.1°C | 46 mm | 53% | 0.6 m/s | 5.4 |
| 2007 | 25.7°C | 18.3°C | 10.9°C | 32.6°C | 5.4°C | 13 mm | 44% | 0.7 m/s | 5.9 |
| 2006 | 25.7°C | 18.5°C | 11.2°C | 32.4°C | 3.4°C | 25 mm | 46% | 0.6 m/s | 6 |
| 2005 | 25.8°C | 18.0°C | 10.2°C | 33.1°C | 2.9°C | 23 mm | 47% | 0.6 m/s | 6 |
| 2004 | 24.8°C | 18.0°C | 11.1°C | 33.2°C | 5.9°C | 79 mm | 61% | 0.6 m/s | 5.1 |
| 2003 | 29.1°C | 21.2°C | 13.3°C | 36.2°C | 6.9°C | 20 mm | 43% | 0.6 m/s | 6 |
| 2002 | 23.6°C | 16.7°C | 9.7°C | 28.4°C | 5.8°C | 26 mm | 52% | 0.6 m/s | 6 |
| 2001 | 28.5°C | 20.5°C | 12.6°C | 34.0°C | 6.4°C | 3 mm | 40% | 0.6 m/s | 6.4 |
| 2000 | 26.5°C | 18.8°C | 11.1°C | 34.1°C | 5.9°C | 13 mm | 43% | 0.7 m/s | 6.3 |
| 1999 | 26.2°C | 18.9°C | 11.7°C | 32.2°C | 4.6°C | 31 mm | 55% | 0.6 m/s | 5.4 |
| 1998 | 27.7°C | 20.1°C | 12.5°C | 34.1°C | 6.8°C | 15 mm | 49% | 0.6 m/s | 6.4 |
| 1997 | 24.6°C | 17.8°C | 11.0°C | 31.5°C | 4.0°C | 41 mm | 60% | 0.6 m/s | 5.9 |
| 1996 | 24.4°C | 17.5°C | 10.7°C | 31.9°C | 4.3°C | 33 mm | 54% | 0.7 m/s | 5.8 |
| 1995 | 22.3°C | 15.5°C | 8.7°C | 29.4°C | 3.9°C | 37 mm | 57% | 0.7 m/s | 5.1 |
| 1994 | 27.4°C | 19.8°C | 12.1°C | 34.6°C | 7.1°C | 6 mm | 42% | 0.6 m/s | 5.9 |
| 1993 ❄️ | 21.4°C | 15.1°C | 8.7°C | 29.1°C | 1.6°C | 56 mm | 65% | 0.6 m/s | 5.5 |
| 1992 | 24.8°C | 17.6°C | 10.3°C | 33.3°C | -1.6°C | 36 mm | 47% | 0.6 m/s | 5.9 |
| 1991 | 26.8°C | 19.7°C | 12.5°C | 34.3°C | 6.7°C | 20 mm | 51% | 0.6 m/s | 5.9 |
| 1990 | 25.1°C | 18.5°C | 12.0°C | 33.7°C | 6.5°C | 59 mm | 60% | 0.6 m/s | 5.6 |
| 1989 🌧️ | 22.3°C | 16.0°C | 9.7°C | 32.4°C | 5.4°C | 97 mm | 62% | 0.6 m/s | 4.9 |
| 1988 | 26.3°C | 18.4°C | 10.5°C | 32.5°C | 5.7°C | 10 mm | 42% | 0.6 m/s | 5.8 |
| 1987 | 22.4°C | 15.6°C | 8.8°C | 30.5°C | 4.2°C | 49 mm | 57% | 0.6 m/s | 5.6 |
| 1986 | 27.2°C | 19.8°C | 12.4°C | 32.7°C | 8.2°C | 36 mm | 45% | 0.6 m/s | 6.2 |
| 1985 | 22.9°C | 15.7°C | 8.6°C | 29.4°C | 3.1°C | 61 mm | 53% | 0.6 m/s | 5.2 |
| 1984 | 26.7°C | 19.3°C | 11.9°C | 31.8°C | 3.2°C | 39 mm | 48% | 0.6 m/s | 5.7 |
| 1983 | 26.7°C | 20.0°C | 13.4°C | 35.2°C | 8.1°C | 28 mm | 56% | 0.6 m/s | — |
| 1982 | 24.7°C | 18.0°C | 11.2°C | 31.1°C | 5.3°C | 29 mm | 54% | 0.6 m/s | — |
| 1981 | 28.4°C | 20.5°C | 12.5°C | 34.6°C | 6.2°C | 16 mm | 49% | 0.5 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 25.8°C with lows near 11.4°C (mean 18.6°C), based on 45 years of NASA POWER data.
August averages 35 mm of rainfall in Kalispell, one of the drier months. The wettest on record was 97 mm in 1989.
The hottest August reached 37.2°C in 2018. The coldest dipped to -1.6°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.2°C. Daytime highs moved from 25.9°C to 26.8°C and overnight lows from 11.5°C to 13°C over the same span.
August is one of the warmer months of the year in Kalispell and one of the drier months, so plan for around 25.8°C daytime highs and 11.4°C at night.
Not quite — August is the 12th coolest month in Kalispell, averaging 18.6°C.
For August in Kalispell, pack light layers you can adjust through the day, with typical highs of 25.8°C and lows of 11.4°C.
Relative humidity in August averages 52% — relatively dry.
Average wind speed in August is 0.6 m/s. The windiest August on record averaged 0.7 m/s (1995).
The wettest August on record was 1989 with 97 mm. On average, August sees 35 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 Kalispell behaves each August, 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 August specifically, along with year-by-year records and how the month has changed over the decades.
