🇳🇴 Weather in Tromsø in September
This is what the weather in Tromsø (Northern Norway, Norway) was like in September in 2017–2026.
Key facts at a glance
Avg. daytime high
10.3 °C
8.8 °C – 12.9 °C
Avg. night-time low
5.0 °C
3.6 °C – 7.4 °C
Avg. rain days in period
18.2
61 % of days · ≥ 1.0 mm
Avg. precipitation in period
117 mm
23.6 mm – 202 mm
Avg. sunshine per day
n/a
Sunshine duration is not available from this data source.
Avg. sea temperature
–
Sea temperature unavailable for today (daily limit).
Extremes: Highest temperature 20.0 °C (9 Sep 2024) · Lowest temperature -1.4 °C (24 Sep 2019) · Avg. daily peak wind 11 km/h
Weather mix of all days
- 14Sunny
- 53Partly cloudy
- 41Cloudy
- 100Light rain
- 82Rain
Summary
- On average 10.3 °C during the day and 5.0 °C at night.
- On average 18.2 rain days (Rain day = at least 1.0 mm of precipitation) with 117 mm of precipitation in total.
- Prevailing: Light rain.
- Warmest year: 2025 (avg. 12.9 °C), coolest: 2019 (avg. 8.8 °C).
- Wettest year: 2020 (202 mm), driest: 2017 (23.6 mm).
- Extremes: 20.0 °C on 9 Sep 2024 and -1.4 °C on 24 Sep 2019.
Overall values from all 10 years. How is this calculated?
Charts
Temperatures per year
Average over your travel period
Precipitation & rain days
Year by year
2026
Avg. max10.0°Avg. min5.1°- Rain days
- 20 Rain days
- Precipitation
- 99.5 mm
- Avg. sunshine per day
- n/a
- Sea temperature
- –
Max 13.1 °C · Min 1.3 °C
2025
Avg. max12.9°Avg. min7.4°- Rain days
- 14 Rain days
- Precipitation
- 123 mm
- Avg. cloud cover
- 72 % cloudy
- Sea temperature
- –
Max 18.7 °C · Min 1.1 °C
2024
Avg. max11.5°Avg. min6.5°- Rain days
- 18 Rain days
- Precipitation
- 101 mm
- Avg. cloud cover
- 74 % cloudy
- Sea temperature
- –
Max 20.0 °C · Min 0.7 °C
2023
Avg. max10.1°Avg. min5.5°- Rain days
- 27 Rain days
- Precipitation
- 197 mm
- Avg. cloud cover
- 88 % cloudy
- Sea temperature
- –
Max 15.9 °C · Min -1.4 °C
2022
Avg. max9.1°Avg. min3.9°- Rain days
- 13 Rain days
- Precipitation
- 67.7 mm
- Avg. cloud cover
- 76 % cloudy
- Sea temperature
- –
Max 12.0 °C · Min -1.1 °C
2021
Avg. max9.2°Avg. min4.2°- Rain days
- 18 Rain days
- Precipitation
- 122 mm
- Avg. cloud cover
- 82 % cloudy
- Sea temperature
- –
Max 14.7 °C · Min 0.7 °C
2020
Avg. max9.5°Avg. min4.7°- Rain days
- 24 Rain days
- Precipitation
- 202 mm
- Avg. cloud cover
- 86 % cloudy
- Sea temperature
- –
Max 15.9 °C · Min -0.2 °C
2019
Avg. max8.8°Avg. min3.6°- Rain days
- 21 Rain days
- Precipitation
- 107 mm
- Avg. cloud cover
- 87 % cloudy
- Sea temperature
- –
Max 19.1 °C · Min -1.4 °C
2018
Avg. max10.1°Avg. min4.6°- Rain days
- 20 Rain days
- Precipitation
- 129 mm
- Avg. cloud cover
- 76 % cloudy
- Sea temperature
- –
Max 16.9 °C · Min -1.4 °C
2017
Avg. max12.0°Avg. min4.4°- Rain days
- 7 Rain days
- Precipitation
- 23.6 mm
- Avg. cloud cover
- 58 % cloudy
- Sea temperature
- –
Max 16.3 °C · Min -0.9 °C
Frequently asked questions
- How warm is it in Tromsø in September?
- Daytime highs averaged 10.3 °C, night-time lows 5.0 °C. The highest value of the past 10 years was 20.0 °C (9 Sep 2024), the lowest -1.4 °C (24 Sep 2019).
- How often does it rain in Tromsø in September?
- On average there were 18.2 rain days (at least 1 mm) with 117 mm of precipitation in total.
Check your exact travel dates
Choose your travel period – we show the weather for exactly those days.
Other destinations in September
Data sources
- Weather data
- Data obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program
Reanalysis (weather model constrained by observations) on a coarse grid of about 50 km. Values represent a large area and can differ from local conditions, especially on islands, coasts and in mountains. No sunshine duration.
Reanalysis (weather model constrained by observations)
Reanalysis values represent a grid cell (approx. 25–50 km) and may differ from local measurements on coasts, islands and in mountains. - Sea temperature
- MUR SST data were provided by JPL under support by NASA MEaSUREs program; accessed via NOAA CoastWatch ERDDAP
Daily multi-scale ultra-high resolution (≈ 1 km) analysis of satellite measurements (infrared, microwave) and in-situ data. Represents the foundation temperature below the daily warm surface layer. (Satellite and in-situ analysis) - Place search
- Natural Earth (public domain) · GeoNames (CC BY 4.0) / OpenStreetMap (ODbL)