September is one of the warmer months of the year in Gander, with average highs near 16.8°C and lows around 7.3°C (mean 12.1°C). It is about average for rainfall, averaging 105 mm of rainfall and 86% relative humidity across the period.
September is one of the warmer months of the year in Gander. Across 45 years of records, the warmest September in Gander was 2012 — when the month averaged 14.6°C — while the coldest was 1986 at 9°C. Typical September days reach 16.8°C with nights near 7.3°C. The long-term trend is warming, about 0.4°C per decade.
September is about average for rainfall in Gander, averaging 105 mm of rainfall. The wettest September on record was 2010 with 224 mm, while the driest was 2025 at 43 mm.
Relative humidity in Gander during September averages 86%. The most humid September was 1991 at 88%, and the least humid was 1989 at 82%.
September receives about 3.4 kWh/m²/day of solar energy in Gander. The sunniest September was 2025 at 3.8 kWh/m²/day, and the cloudiest was 1991 at 2.8.
Average wind speed in Gander during September is 0.8 m/s. The windiest September was 2004 at 1 m/s, while the calmest were 1990, 2003 and 2024 at 0.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.2°C | 11.8°C | 12.2°C | 12.2°C | 13.4°C | +2.2°C |
| Avg High | 16.0°C | 16.4°C | 16.9°C | 16.9°C | 18.2°C | +2.2°C |
| Avg Low | 6.4°C | 7.1°C | 7.4°C | 7.5°C | 8.6°C | +2.2°C |
| Avg Rain | 100 mm | 112 mm | 113 mm | 110 mm | 80 mm | -20 mm |
September temperatures in Gander have risen by about 1.9°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -2.9°C (1986) to a record high of 27.7°C (2003).
Rainfall in September is about average for rainfall, averaging 105 mm, with a wettest year of 224 mm.
One of the best times to visit Gander
September is one of the best times to visit Gander. Expect days averaging 16.8°C and nights around 7.3°C (mean 12.1°C) — warmer than Gander's yearly average — with higher rainfall (105 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 | 17.3°C | 12.4°C | 7.5°C | 26.1°C | 4.3°C | 43 mm | 85% | 0.8 m/s | 3.8 |
| 2024 | 17.9°C | 13.4°C | 8.9°C | 26.1°C | 4.9°C | 63 mm | 87% | 0.7 m/s | 3.4 |
| 2023 | 18.2°C | 13.5°C | 8.8°C | 26.3°C | 1.8°C | 80 mm | 87% | 0.8 m/s | 3.2 |
| 2022 | 18.4°C | 14.2°C | 10.0°C | 27.3°C | 4.3°C | 99 mm | 85% | 0.9 m/s | 3.5 |
| 2021 | 19.0°C | 13.6°C | 8.2°C | 25.7°C | 2.2°C | 116 mm | 87% | 0.8 m/s | 3.4 |
| 2020 | 18.2°C | 13.1°C | 8.0°C | 24.8°C | 1.2°C | 76 mm | 83% | 0.9 m/s | 3.6 |
| 2019 | 15.0°C | 10.4°C | 5.7°C | 25.2°C | 1.0°C | 100 mm | 86% | 0.9 m/s | 3.3 |
| 2018 | 15.7°C | 10.8°C | 5.9°C | 24.6°C | -1.6°C | 87 mm | 84% | 0.8 m/s | 3.7 |
| 2017 | 16.7°C | 12.4°C | 8.0°C | 26.2°C | 1.3°C | 95 mm | 87% | 0.8 m/s | 3.1 |
| 2016 | 15.4°C | 10.9°C | 6.5°C | 26.6°C | 1.0°C | 116 mm | 87% | 0.8 m/s | 3.2 |
| 2015 | 17.1°C | 12.2°C | 7.3°C | 25.2°C | 0.4°C | 90 mm | 87% | 0.9 m/s | 3.2 |
| 2014 | 17.1°C | 11.9°C | 6.7°C | 24.0°C | -0.2°C | 65 mm | 83% | 0.9 m/s | 3.7 |
| 2013 | 18.1°C | 13.5°C | 8.9°C | 24.6°C | -1.3°C | 143 mm | 87% | 0.9 m/s | 3.1 |
| 2012 🔥 | 19.7°C | 14.6°C | 9.4°C | 24.5°C | 3.9°C | 110 mm | 86% | 0.8 m/s | 3.5 |
| 2011 | 17.3°C | 12.6°C | 8.0°C | 25.0°C | 2.9°C | 72 mm | 85% | 0.9 m/s | 3.6 |
| 2010 🌧️ | 16.5°C | 12.3°C | 8.1°C | 24.3°C | -0.1°C | 224 mm | 86% | 0.9 m/s | 3.1 |
| 2009 | 15.9°C | 10.9°C | 5.9°C | 22.1°C | 0.8°C | 76 mm | 85% | 0.9 m/s | 3.6 |
| 2008 | 17.7°C | 12.9°C | 8.1°C | 26.9°C | 0.5°C | 72 mm | 86% | 0.8 m/s | 3.3 |
| 2007 | 16.4°C | 11.4°C | 6.3°C | 23.5°C | 2.7°C | 116 mm | 84% | 0.8 m/s | 3.2 |
| 2006 | 17.1°C | 12.3°C | 7.5°C | 22.9°C | 3.6°C | 124 mm | 86% | 0.8 m/s | 3.3 |
| 2005 | 17.0°C | 12.7°C | 8.3°C | 26.6°C | 2.2°C | 135 mm | 86% | 0.9 m/s | 3 |
| 2004 | 15.4°C | 11.1°C | 6.8°C | 24.0°C | 1.9°C | 213 mm | 86% | 1 m/s | 3.2 |
| 2003 | 19.1°C | 14.3°C | 9.5°C | 27.7°C | 4.6°C | 49 mm | 86% | 0.7 m/s | 3.7 |
| 2002 | 16.5°C | 11.4°C | 6.2°C | 23.5°C | 1.0°C | 107 mm | 84% | 0.9 m/s | 3.4 |
| 2001 | 17.5°C | 12.7°C | 7.9°C | 27.3°C | 3.4°C | 139 mm | 87% | 0.8 m/s | 3.5 |
| 2000 | 16.7°C | 11.8°C | 7.0°C | 24.0°C | 1.0°C | 102 mm | 85% | 0.8 m/s | 3.3 |
| 1999 | 19.1°C | 13.8°C | 8.5°C | 26.1°C | 1.2°C | 97 mm | 86% | 0.8 m/s | 3.3 |
| 1998 | 15.6°C | 11.7°C | 7.8°C | 24.3°C | 3.1°C | 129 mm | 88% | 0.9 m/s | 3.2 |
| 1997 | 17.0°C | 12.6°C | 8.2°C | 22.4°C | 2.2°C | 86 mm | 88% | 0.8 m/s | 3 |
| 1996 | 14.2°C | 9.4°C | 4.7°C | 23.6°C | -0.6°C | 124 mm | 86% | 0.9 m/s | 3.3 |
| 1995 | 16.3°C | 11.3°C | 6.3°C | 21.4°C | 0.5°C | 134 mm | 84% | 0.8 m/s | 3.7 |
| 1994 | 15.3°C | 11.1°C | 6.8°C | 21.2°C | 0.6°C | 111 mm | 87% | 0.8 m/s | 3.1 |
| 1993 | 17.3°C | 12.2°C | 7.0°C | 23.9°C | 1.3°C | 95 mm | 84% | 0.8 m/s | 3.4 |
| 1992 | 17.2°C | 12.2°C | 7.2°C | 24.7°C | -0.4°C | 96 mm | 86% | 0.8 m/s | 3.4 |
| 1991 | 14.9°C | 10.9°C | 6.8°C | 24.2°C | 2.3°C | 150 mm | 88% | 0.8 m/s | 2.8 |
| 1990 | 17.4°C | 12.3°C | 7.2°C | 22.3°C | 1.9°C | 96 mm | 85% | 0.7 m/s | 3.5 |
| 1989 | 18.1°C | 12.3°C | 6.5°C | 25.4°C | -1.5°C | 95 mm | 82% | 0.9 m/s | 3.7 |
| 1988 | 16.2°C | 11.3°C | 6.3°C | 23.7°C | -0.1°C | 86 mm | 84% | 0.9 m/s | 3.5 |
| 1987 | 15.6°C | 10.8°C | 6.0°C | 22.1°C | 1.6°C | 79 mm | 84% | 0.8 m/s | 3.1 |
| 1986 ❄️ | 13.6°C | 9.0°C | 4.4°C | 21.4°C | -2.9°C | 133 mm | 86% | 0.8 m/s | 3.5 |
| 1985 | 15.5°C | 11.0°C | 6.5°C | 24.9°C | 1.5°C | 63 mm | 85% | 0.8 m/s | 3.5 |
| 1984 | 15.3°C | 10.6°C | 6.0°C | 24.0°C | 0.3°C | 108 mm | 84% | 0.9 m/s | 3.5 |
| 1983 | 16.3°C | 11.7°C | 7.1°C | 25.3°C | 2.4°C | 94 mm | 87% | 0.8 m/s | — |
| 1982 | 16.7°C | 11.8°C | 6.9°C | 25.9°C | 0.5°C | 109 mm | 86% | 0.8 m/s | — |
| 1981 | 16.8°C | 12.5°C | 8.1°C | 23.5°C | 3.1°C | 129 mm | 85% | 0.8 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 16.8°C with lows near 7.3°C (mean 12.1°C), based on 45 years of NASA POWER data.
September averages 105 mm of rainfall in Gander, about average for rainfall. The wettest on record was 224 mm in 2010.
The hottest September reached 27.7°C in 2003. The coldest dipped to -2.9°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.9°C. Daytime highs moved from 16.1°C to 18.2°C and overnight lows from 6.9°C to 8.7°C over the same span.
September is one of the warmer months of the year in Gander and about average for rainfall, so plan for around 16.8°C daytime highs and 7.3°C at night.
Not quite — September is the 10th coolest month in Gander, averaging 12.1°C.
For September in Gander, pack warm layers and a jacket for chilly mornings, with typical highs of 16.8°C and lows of 7.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 86% — quite humid.
Average wind speed in September is 0.8 m/s. The windiest September on record averaged 1 m/s (2004).
The wettest September on record was 2010 with 224 mm. On average, September sees 105 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 Gander 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.
