September is one of the warmer months of the year in Lowestoft, with average highs near 17.2°C and lows around 13.9°C (mean 15.6°C). It is about average for rainfall, averaging 68 mm of rainfall and 82% relative humidity across the period.
September is one of the warmer months of the year in Lowestoft. Across 45 years of records, the warmest September in Lowestoft was 2023 — when the month averaged 18.1°C — while the coldest was 1986 at 12.9°C. Typical September days reach 17.2°C with nights near 13.9°C. The long-term trend is warming, about 0.4°C per decade.
September is about average for rainfall in Lowestoft, averaging 68 mm of rainfall. The wettest September on record was 1995 with 128 mm, while the driest was 1997 at 20 mm.
Relative humidity in Lowestoft during September averages 82%. The most humid September was 1998 at 88%, and the least humid was 1990 at 78%.
September receives about 3.1 kWh/m²/day of solar energy in Lowestoft. The sunniest September was 2003 at 3.6 kWh/m²/day, and the cloudiest was 2001 at 2.5.
Average wind speed in Lowestoft during September is 5.1 m/s. The windiest September was 2025 at 6.2 m/s, while the calmest was 2014 at 3.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.9°C | 15.1°C | 15.8°C | 15.7°C | 16.7°C | +1.8°C |
| Avg High | 16.6°C | 16.7°C | 17.4°C | 17.4°C | 18.3°C | +1.7°C |
| Avg Low | 13.1°C | 13.5°C | 14.3°C | 14.0°C | 15.2°C | +2.1°C |
| Avg Rain | 56 mm | 81 mm | 66 mm | 65 mm | 72 mm | +16 mm |
September temperatures in Lowestoft have risen by about 1.8°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 9.1°C (1988) to a record high of 22.7°C (2023).
Rainfall in September is about average for rainfall, averaging 68 mm, with a wettest year of 128 mm.
One of the best times to visit Lowestoft
September is one of the best times to visit Lowestoft. Expect days averaging 17.2°C and nights around 13.9°C (mean 15.6°C) — warmer than Lowestoft's yearly average — with moderate rainfall (68 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 | 18.2°C | 16.4°C | 14.7°C | 21.4°C | 12.6°C | 42 mm | 78% | 6.2 m/s | 3.5 |
| 2024 | 17.7°C | 16.3°C | 14.9°C | 21.2°C | 10.9°C | 101 mm | 84% | 5.4 m/s | 3.1 |
| 2023 🔥 | 19.8°C | 18.1°C | 16.5°C | 22.7°C | 13.1°C | 68 mm | 84% | 4.4 m/s | 3.5 |
| 2022 | 17.9°C | 16.6°C | 15.3°C | 21.7°C | 10.4°C | 99 mm | 80% | 4.9 m/s | 3.2 |
| 2021 | 18.6°C | 17.0°C | 15.4°C | 20.7°C | 11.3°C | 51 mm | 85% | 4.2 m/s | 3.2 |
| 2020 | 17.8°C | 16.0°C | 14.2°C | 20.9°C | 11.3°C | 69 mm | 81% | 5.2 m/s | 3.3 |
| 2019 | 17.7°C | 15.9°C | 14.0°C | 20.7°C | 12.2°C | 98 mm | 79% | 5.4 m/s | 3.4 |
| 2018 | 17.7°C | 15.9°C | 14.1°C | 20.4°C | 11.0°C | 46 mm | 78% | 5.3 m/s | 3.3 |
| 2017 | 16.8°C | 15.3°C | 13.7°C | 19.7°C | 10.9°C | 78 mm | 82% | 5.2 m/s | 3 |
| 2016 | 19.3°C | 17.6°C | 15.9°C | 21.7°C | 12.8°C | 50 mm | 83% | 4.8 m/s | 3.1 |
| 2015 | 16.0°C | 14.6°C | 13.1°C | 18.3°C | 10.6°C | 91 mm | 80% | 5.1 m/s | 3.3 |
| 2014 | 17.9°C | 16.4°C | 14.9°C | 19.4°C | 11.8°C | 20 mm | 85% | 3.5 m/s | 3 |
| 2013 | 16.8°C | 15.2°C | 13.6°C | 21.1°C | 10.1°C | 58 mm | 82% | 4.9 m/s | 3.2 |
| 2012 | 16.9°C | 15.0°C | 13.0°C | 20.8°C | 10.3°C | 63 mm | 80% | 5.5 m/s | 3.4 |
| 2011 | 17.9°C | 16.0°C | 14.1°C | 20.4°C | 11.7°C | 54 mm | 84% | 5.5 m/s | 3.4 |
| 2010 | 16.7°C | 15.1°C | 13.6°C | 19.4°C | 11.1°C | 91 mm | 83% | 5.2 m/s | 2.9 |
| 2009 | 17.6°C | 15.9°C | 14.3°C | 20.4°C | 12.2°C | 24 mm | 81% | 5.3 m/s | 3.3 |
| 2008 | 16.8°C | 15.5°C | 14.2°C | 19.2°C | 11.6°C | 98 mm | 79% | 5.2 m/s | 2.8 |
| 2007 | 16.8°C | 15.2°C | 13.6°C | 19.2°C | 11.4°C | 54 mm | 83% | 5.5 m/s | 3.3 |
| 2006 | 19.2°C | 17.6°C | 16.1°C | 22.4°C | 13.9°C | 65 mm | 87% | 4.7 m/s | 3.3 |
| 2005 | 17.8°C | 16.1°C | 14.5°C | 20.2°C | 11.1°C | 60 mm | 85% | 4.4 m/s | 3.2 |
| 2004 | 17.5°C | 15.6°C | 13.8°C | 22.2°C | 10.4°C | 49 mm | 83% | 6.1 m/s | 3.3 |
| 2003 | 17.7°C | 15.9°C | 14.1°C | 21.1°C | 10.2°C | 44 mm | 78% | 4 m/s | 3.6 |
| 2002 | 17.0°C | 15.6°C | 14.3°C | 19.6°C | 12.2°C | 44 mm | 82% | 4.5 m/s | 3 |
| 2001 | 15.8°C | 14.4°C | 13.0°C | 19.3°C | 11.2°C | 121 mm | 85% | 6 m/s | 2.5 |
| 2000 | 17.8°C | 16.3°C | 14.7°C | 21.0°C | 12.8°C | 104 mm | 86% | 5.2 m/s | 2.6 |
| 1999 | 18.3°C | 16.7°C | 15.2°C | 21.3°C | 12.9°C | 89 mm | 87% | 4.9 m/s | 3 |
| 1998 | 16.8°C | 15.4°C | 14.0°C | 19.3°C | 9.9°C | 107 mm | 88% | 5.2 m/s | 2.9 |
| 1997 | 17.5°C | 15.8°C | 14.1°C | 20.2°C | 11.3°C | 20 mm | 80% | 4.9 m/s | 3.1 |
| 1996 | 15.9°C | 14.5°C | 13.1°C | 19.9°C | 11.6°C | 38 mm | 80% | 5.7 m/s | 3 |
| 1995 🌧️ | 16.7°C | 15.1°C | 13.6°C | 18.7°C | 9.1°C | 128 mm | 82% | 5.3 m/s | 2.8 |
| 1994 | 16.0°C | 14.5°C | 13.0°C | 18.6°C | 9.7°C | 107 mm | 83% | 5.7 m/s | 2.9 |
| 1993 | 15.4°C | 14.2°C | 12.9°C | 17.7°C | 11.2°C | 120 mm | 84% | 5 m/s | 2.6 |
| 1992 | 16.7°C | 14.8°C | 12.9°C | 19.2°C | 10.8°C | 67 mm | 84% | 5.4 m/s | 3.1 |
| 1991 | 17.6°C | 15.8°C | 13.9°C | 20.0°C | 11.4°C | 84 mm | 79% | 4.3 m/s | 3.4 |
| 1990 | 16.3°C | 14.4°C | 12.5°C | 20.9°C | 9.5°C | 54 mm | 78% | 5.3 m/s | 2.7 |
| 1989 | 17.6°C | 16.1°C | 14.5°C | 20.0°C | 12.1°C | 32 mm | 83% | 4.7 m/s | 2.9 |
| 1988 | 16.1°C | 14.4°C | 12.6°C | 18.4°C | 9.1°C | 58 mm | 84% | 5.8 m/s | 2.6 |
| 1987 | 16.7°C | 14.9°C | 13.1°C | 20.2°C | 10.3°C | 44 mm | 83% | 4.9 m/s | 3 |
| 1986 ❄️ | 14.6°C | 12.9°C | 11.2°C | 17.5°C | 10.1°C | 37 mm | 80% | 4.3 m/s | 3.3 |
| 1985 | 16.9°C | 15.0°C | 13.0°C | 19.3°C | 10.2°C | 24 mm | 85% | 4.6 m/s | 3 |
| 1984 | 16.1°C | 14.5°C | 12.8°C | 21.1°C | 10.2°C | 95 mm | 83% | 5.4 m/s | 2.7 |
| 1983 | 16.4°C | 14.6°C | 12.7°C | 19.7°C | 10.3°C | 82 mm | 84% | 6.1 m/s | — |
| 1982 | 17.4°C | 15.5°C | 13.6°C | 19.4°C | 10.5°C | 47 mm | 84% | 4.5 m/s | — |
| 1981 | 17.7°C | 16.0°C | 14.3°C | 20.3°C | 10.5°C | 81 mm | 82% | 5.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 17.2°C with lows near 13.9°C (mean 15.6°C), based on 45 years of NASA POWER data.
September averages 68 mm of rainfall in Lowestoft, about average for rainfall. The wettest on record was 128 mm in 1995.
The hottest September reached 22.7°C in 2023. The coldest dipped to 9.1°C in 1988.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.8°C. Daytime highs moved from 16.9°C to 18.4°C and overnight lows from 13.3°C to 15.4°C over the same span.
September is one of the warmer months of the year in Lowestoft and about average for rainfall, so plan for around 17.2°C daytime highs and 13.9°C at night.
Not quite — September is the 10th coolest month in Lowestoft, averaging 15.6°C.
For September in Lowestoft, pack light layers you can adjust through the day, with typical highs of 17.2°C and lows of 13.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 82% — quite humid.
Average wind speed in September is 5.1 m/s. The windiest September on record averaged 6.2 m/s (2025).
The wettest September on record was 1995 with 128 mm. On average, September sees 68 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 Lowestoft 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.
