September is one of the warmer months of the year in Kamloops, with average highs near 17.9°C and lows around 4.7°C (mean 11.3°C). It is about average for rainfall, averaging 33 mm of rainfall and 68% relative humidity across the period.
September is one of the warmer months of the year in Kamloops. Across 45 years of records, the warmest September in Kamloops was 2025 — when the month averaged 15.1°C — while the coldest was 1985 at 7.7°C. Typical September days reach 17.9°C with nights near 4.7°C. The long-term trend is warming, about 0.5°C per decade.
September is about average for rainfall in Kamloops, averaging 33 mm of rainfall. The wettest September on record was 1985 with 68 mm, while the driest was 1991 at 8 mm.
Relative humidity in Kamloops during September averages 68%. The most humid September was 2004 at 77%, and the least humid was 1993 at 56%.
September receives about 3.9 kWh/m²/day of solar energy in Kamloops. The sunniest Septembers were 1990, 1993 and 1995 at 4.6 kWh/m²/day, and the cloudiest was 2019 at 3.2.
Average wind speed in Kamloops during September is 0.3 m/s. The windiest Septembers were 1999, 2008 and 2012, among others at 0.4 m/s, while the calmest were 2010, 2019 and 2021, among others at 0.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.1°C | 11.8°C | 11.0°C | 11.2°C | 13.2°C | +3.1°C |
| Avg High | 16.6°C | 18.8°C | 17.6°C | 17.5°C | 19.7°C | +3.1°C |
| Avg Low | 3.6°C | 4.8°C | 4.4°C | 5.0°C | 6.7°C | +3.1°C |
| Avg Rain | 42 mm | 24 mm | 33 mm | 39 mm | 25 mm | -17 mm |
September temperatures in Kamloops have risen by about 3.9°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -5.6°C (1983) to a record high of 34.1°C (2025).
Rainfall in September is about average for rainfall, averaging 33 mm, with a wettest year of 68 mm.
One of the best times to visit Kamloops
September is one of the best times to visit Kamloops. Expect days averaging 17.9°C and nights around 4.7°C (mean 11.3°C) — warmer than Kamloops's yearly average — with moderate rainfall (33 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 🔥 | 21.5°C | 15.1°C | 8.7°C | 34.1°C | 3.4°C | 32 mm | 71% | 0.3 m/s | 3.9 |
| 2024 | 19.3°C | 13.1°C | 6.8°C | 30.9°C | -2.2°C | 26 mm | 69% | 0.3 m/s | 3.9 |
| 2023 | 18.5°C | 11.8°C | 5.2°C | 26.9°C | -0.9°C | 30 mm | 68% | 0.3 m/s | 3.8 |
| 2022 | 21.3°C | 13.9°C | 6.5°C | 31.4°C | -0.7°C | 10 mm | 63% | 0.3 m/s | 4.2 |
| 2021 | 17.0°C | 11.1°C | 5.2°C | 26.7°C | -1.4°C | 33 mm | 73% | 0.2 m/s | 3.4 |
| 2020 | 20.6°C | 14.0°C | 7.5°C | 28.6°C | 1.9°C | 21 mm | 70% | 0.3 m/s | 4 |
| 2019 | 15.7°C | 10.5°C | 5.3°C | 28.1°C | -2.5°C | 63 mm | 77% | 0.2 m/s | 3.2 |
| 2018 | 14.6°C | 9.1°C | 3.6°C | 25.3°C | -1.0°C | 64 mm | 75% | 0.3 m/s | 3.5 |
| 2017 | 19.1°C | 12.5°C | 5.9°C | 28.6°C | -1.6°C | 14 mm | 66% | 0.3 m/s | 3.6 |
| 2016 | 15.7°C | 9.8°C | 4.0°C | 24.1°C | -0.7°C | 44 mm | 73% | 0.3 m/s | 3.7 |
| 2015 | 16.2°C | 9.9°C | 3.6°C | 27.2°C | -1.0°C | 36 mm | 70% | 0.3 m/s | 3.8 |
| 2014 | 18.4°C | 11.8°C | 5.2°C | 26.3°C | -2.4°C | 28 mm | 67% | 0.3 m/s | 4 |
| 2013 | 18.5°C | 12.5°C | 6.4°C | 28.9°C | -3.7°C | 51 mm | 72% | 0.3 m/s | 3.9 |
| 2012 | 20.9°C | 13.3°C | 5.7°C | 27.0°C | -0.6°C | 9 mm | 56% | 0.4 m/s | 4.5 |
| 2011 | 20.5°C | 13.3°C | 6.1°C | 29.3°C | 0.5°C | 17 mm | 62% | 0.3 m/s | 4.2 |
| 2010 | 15.4°C | 9.7°C | 4.0°C | 23.9°C | -0.4°C | 65 mm | 76% | 0.2 m/s | 3.5 |
| 2009 | 20.1°C | 12.8°C | 5.6°C | 30.0°C | -1.3°C | 43 mm | 64% | 0.2 m/s | 4.2 |
| 2008 | 18.7°C | 11.7°C | 4.7°C | 26.5°C | 1.5°C | 21 mm | 61% | 0.4 m/s | 4 |
| 2007 | 15.6°C | 9.6°C | 3.6°C | 26.7°C | -1.9°C | 43 mm | 72% | 0.3 m/s | 3.6 |
| 2006 | 19.9°C | 12.8°C | 5.7°C | 30.6°C | -1.2°C | 39 mm | 66% | 0.3 m/s | 4 |
| 2005 | 15.3°C | 9.3°C | 3.4°C | 21.7°C | -2.7°C | 38 mm | 73% | 0.3 m/s | 3.7 |
| 2004 | 15.0°C | 9.4°C | 3.9°C | 21.9°C | -2.1°C | 50 mm | 77% | 0.2 m/s | 3.4 |
| 2003 | 19.4°C | 12.1°C | 4.8°C | 30.0°C | 0.2°C | 19 mm | 61% | 0.3 m/s | 4.1 |
| 2002 | 16.9°C | 10.2°C | 3.5°C | 25.1°C | -1.4°C | 29 mm | 68% | 0.3 m/s | 3.8 |
| 2001 | 19.3°C | 12.0°C | 4.7°C | 27.0°C | 0.5°C | 15 mm | 63% | 0.3 m/s | 4.3 |
| 2000 | 15.8°C | 9.7°C | 3.7°C | 23.0°C | -5.4°C | 38 mm | 72% | 0.3 m/s | 3.9 |
| 1999 | 17.4°C | 10.4°C | 3.4°C | 25.8°C | -2.4°C | 19 mm | 62% | 0.4 m/s | 4.3 |
| 1998 | 21.2°C | 13.7°C | 6.2°C | 27.5°C | -0.1°C | 18 mm | 62% | 0.3 m/s | 4.2 |
| 1997 | 18.2°C | 11.8°C | 5.4°C | 24.8°C | 0.5°C | 34 mm | 70% | 0.3 m/s | 4 |
| 1996 | 15.0°C | 9.2°C | 3.4°C | 25.8°C | -1.1°C | 53 mm | 73% | 0.3 m/s | 3.7 |
| 1995 | 21.0°C | 13.2°C | 5.5°C | 28.6°C | -1.7°C | 22 mm | 58% | 0.4 m/s | 4.6 |
| 1994 | 20.4°C | 13.0°C | 5.7°C | 27.0°C | 1.8°C | 12 mm | 65% | 0.3 m/s | 4 |
| 1993 | 20.1°C | 12.5°C | 4.8°C | 27.6°C | -0.6°C | 12 mm | 56% | 0.4 m/s | 4.6 |
| 1992 | 15.3°C | 8.9°C | 2.5°C | 23.0°C | -5.2°C | 49 mm | 70% | 0.2 m/s | 3.5 |
| 1991 | 18.8°C | 11.8°C | 4.9°C | 24.4°C | 0.0°C | 8 mm | 67% | 0.3 m/s | 4.5 |
| 1990 | 20.3°C | 13.0°C | 5.8°C | 25.2°C | 2.4°C | 10 mm | 64% | 0.4 m/s | 4.6 |
| 1989 | 19.1°C | 11.8°C | 4.6°C | 25.0°C | 0.1°C | 26 mm | 65% | 0.4 m/s | 4.4 |
| 1988 | 17.8°C | 11.2°C | 4.6°C | 33.7°C | -2.4°C | 59 mm | 66% | 0.3 m/s | 3.6 |
| 1987 | 21.3°C | 13.4°C | 5.6°C | 28.2°C | 0.6°C | 14 mm | 58% | 0.4 m/s | 4.2 |
| 1986 | 14.7°C | 8.7°C | 2.7°C | 22.3°C | -2.0°C | 52 mm | 71% | 0.3 m/s | 3.7 |
| 1985 ❄️ 🌧️ | 13.5°C | 7.7°C | 1.9°C | 21.1°C | -2.6°C | 68 mm | 70% | 0.3 m/s | 3.8 |
| 1984 | 14.3°C | 8.1°C | 1.9°C | 22.0°C | -3.0°C | 36 mm | 69% | 0.3 m/s | 3.5 |
| 1983 | 14.1°C | 8.0°C | 1.9°C | 20.4°C | -5.6°C | 45 mm | 70% | 0.3 m/s | — |
| 1982 | 17.2°C | 11.2°C | 5.1°C | 26.2°C | 0.3°C | 47 mm | 73% | 0.3 m/s | — |
| 1981 | 17.0°C | 10.7°C | 4.3°C | 29.0°C | -2.8°C | 35 mm | 71% | 0.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 17.9°C with lows near 4.7°C (mean 11.3°C), based on 45 years of NASA POWER data.
September averages 33 mm of rainfall in Kamloops, about average for rainfall. The wettest on record was 68 mm in 1985.
The hottest September reached 34.1°C in 2025. The coldest dipped to -5.6°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 3.9°C. Daytime highs moved from 15.2°C to 19.5°C and overnight lows from 3°C to 6.5°C over the same span.
September is one of the warmer months of the year in Kamloops and about average for rainfall, so plan for around 17.9°C daytime highs and 4.7°C at night.
Not quite — September is the 9th coolest month in Kamloops, averaging 11.3°C.
For September in Kamloops, pack warm layers and a jacket for chilly mornings, with typical highs of 17.9°C and lows of 4.7°C.
Relative humidity in September averages 68% — moderately humid.
Average wind speed in September is 0.3 m/s. The windiest September on record averaged 0.4 m/s (1987).
The wettest September on record was 1985 with 68 mm. On average, September sees 33 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 Kamloops behaves each September, 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 September specifically, along with year-by-year records and how the month has changed over the decades.
