🇳🇴 Weather in Oslo in September
This is what the weather in Oslo (Norway) was like in September in 2017–2026.
Key facts at a glance
Avg. daytime high
14.8 °C
13.3 °C – 16.6 °C
Avg. night-time low
7.5 °C
6.3 °C – 9.0 °C
Avg. rain days in period
14.5
48 % of days · ≥ 1.0 mm
Avg. precipitation in period
114 mm
67.7 mm – 149 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 23.6 °C (5 Sep 2024) · Lowest temperature -1.9 °C (25 Sep 2018) · Avg. daily peak wind 10 km/h
Weather mix of all days
- 20Sunny
- 55Partly cloudy
- 66Cloudy
- 71Light rain
- 74Rain
Summary
- On average 14.8 °C during the day and 7.5 °C at night.
- On average 14.5 rain days (Rain day = at least 1.0 mm of precipitation) with 114 mm of precipitation in total.
- Prevailing: Rain.
- Warmest year: 2023 (avg. 16.6 °C), coolest: 2017 (avg. 13.3 °C).
- Wettest year: 2019 (149 mm), driest: 2026 (67.7 mm).
- Extremes: 23.6 °C on 5 Sep 2024 and -1.9 °C on 25 Sep 2018.
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. max15.1°Avg. min7.6°- Rain days
- 16 Rain days
- Precipitation
- 67.7 mm
- Avg. sunshine per day
- n/a
- Sea temperature
- –
Max 19.1 °C · Min 4.6 °C
2025
Avg. max15.4°Avg. min8.5°- Rain days
- 20 Rain days
- Precipitation
- 149 mm
- Avg. cloud cover
- 74 % cloudy
- Sea temperature
- –
Max 20.2 °C · Min 1.4 °C
2024
Avg. max15.8°Avg. min7.9°- Rain days
- 14 Rain days
- Precipitation
- 113 mm
- Avg. cloud cover
- 65 % cloudy
- Sea temperature
- –
Max 23.6 °C · Min -0.4 °C
2023
Avg. max16.6°Avg. min9.0°- Rain days
- 12 Rain days
- Precipitation
- 115 mm
- Avg. cloud cover
- 76 % cloudy
- Sea temperature
- –
Max 22.7 °C · Min 4.1 °C
2022
Avg. max14.0°Avg. min7.0°- Rain days
- 12 Rain days
- Precipitation
- 114 mm
- Avg. cloud cover
- 74 % cloudy
- Sea temperature
- –
Max 18.8 °C · Min 2.8 °C
2021
Avg. max15.2°Avg. min7.5°- Rain days
- 12 Rain days
- Precipitation
- 84.1 mm
- Avg. cloud cover
- 79 % cloudy
- Sea temperature
- –
Max 23.1 °C · Min 4.6 °C
2020
Avg. max14.8°Avg. min6.9°- Rain days
- 15 Rain days
- Precipitation
- 110 mm
- Avg. cloud cover
- 74 % cloudy
- Sea temperature
- –
Max 20.3 °C · Min 3.6 °C
2019
Avg. max13.5°Avg. min6.3°- Rain days
- 12 Rain days
- Precipitation
- 149 mm
- Avg. cloud cover
- 75 % cloudy
- Sea temperature
- –
Max 21.2 °C · Min 2.1 °C
2018
Avg. max14.2°Avg. min6.7°- Rain days
- 16 Rain days
- Precipitation
- 130 mm
- Avg. cloud cover
- 72 % cloudy
- Sea temperature
- –
Max 19.9 °C · Min -1.9 °C
2017
Avg. max13.3°Avg. min7.5°- Rain days
- 16 Rain days
- Precipitation
- 109 mm
- Avg. cloud cover
- 87 % cloudy
- Sea temperature
- –
Max 18.0 °C · Min 3.5 °C
Frequently asked questions
- How warm is it in Oslo in September?
- Daytime highs averaged 14.8 °C, night-time lows 7.5 °C. The highest value of the past 10 years was 23.6 °C (5 Sep 2024), the lowest -1.9 °C (25 Sep 2018).
- How often does it rain in Oslo in September?
- On average there were 14.5 rain days (at least 1 mm) with 114 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)