🇪🇸 Weather in Barcelona in September
This is what the weather in Barcelona (Catalonia, Spain) was like in September in 2017–2026.
Key facts at a glance
Avg. daytime high
26.9 °C
25.0 °C – 29.9 °C
Avg. night-time low
17.9 °C
16.2 °C – 20.1 °C
Avg. rain days in period
10.7
36 % of days · ≥ 1.0 mm
Avg. precipitation in period
69.7 mm
39.0 mm – 119 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 37.4 °C (6 Sep 2026) · Lowest temperature 8.4 °C (27 Sep 2020) · Avg. daily peak wind 18 km/h
Weather mix of all days
- 52Sunny
- 95Partly cloudy
- 23Cloudy
- 63Light rain
- 44Rain
Summary
- On average 26.9 °C during the day and 17.9 °C at night.
- On average 10.7 rain days (Rain day = at least 1.0 mm of precipitation) with 69.7 mm of precipitation in total.
- Prevailing: Partly cloudy.
- Warmest year: 2026 (avg. 29.9 °C), coolest: 2017 (avg. 25.0 °C).
- Wettest year: 2019 (119 mm), driest: 2018 (39.0 mm).
- Extremes: 37.4 °C on 6 Sep 2026 and 8.4 °C on 27 Sep 2020.
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. max29.9°Avg. min20.1°- Rain days
- 7 Rain days
- Precipitation
- 61.7 mm
- Avg. sunshine per day
- n/a
- Sea temperature
- –
Max 37.4 °C · Min 16.5 °C
2025
Avg. max26.2°Avg. min17.9°- Rain days
- 14 Rain days
- Precipitation
- 99.8 mm
- Avg. cloud cover
- 59 % cloudy
- Sea temperature
- –
Max 29.7 °C · Min 13.3 °C
2024
Avg. max25.7°Avg. min16.3°- Rain days
- 17 Rain days
- Precipitation
- 116 mm
- Avg. cloud cover
- 54 % cloudy
- Sea temperature
- –
Max 30.4 °C · Min 11.3 °C
2023
Avg. max28.2°Avg. min18.7°- Rain days
- 5 Rain days
- Precipitation
- 40.0 mm
- Avg. cloud cover
- 45 % cloudy
- Sea temperature
- –
Max 31.3 °C · Min 15.5 °C
2022
Avg. max27.6°Avg. min18.7°- Rain days
- 10 Rain days
- Precipitation
- 54.0 mm
- Avg. cloud cover
- 57 % cloudy
- Sea temperature
- –
Max 33.1 °C · Min 11.2 °C
2021
Avg. max26.9°Avg. min18.4°- Rain days
- 12 Rain days
- Precipitation
- 45.7 mm
- Avg. cloud cover
- 67 % cloudy
- Sea temperature
- –
Max 29.7 °C · Min 15.1 °C
2020
Avg. max26.0°Avg. min16.7°- Rain days
- 11 Rain days
- Precipitation
- 73.2 mm
- Avg. cloud cover
- 51 % cloudy
- Sea temperature
- –
Max 30.3 °C · Min 8.4 °C
2019
Avg. max26.5°Avg. min17.5°- Rain days
- 11 Rain days
- Precipitation
- 119 mm
- Avg. cloud cover
- 50 % cloudy
- Sea temperature
- –
Max 29.2 °C · Min 13.8 °C
2018
Avg. max26.9°Avg. min18.7°- Rain days
- 10 Rain days
- Precipitation
- 39.0 mm
- Avg. cloud cover
- 54 % cloudy
- Sea temperature
- –
Max 31.2 °C · Min 13.4 °C
2017
Avg. max25.0°Avg. min16.2°- Rain days
- 10 Rain days
- Precipitation
- 49.2 mm
- Avg. cloud cover
- 58 % cloudy
- Sea temperature
- –
Max 29.9 °C · Min 10.3 °C
Frequently asked questions
- How warm is it in Barcelona in September?
- Daytime highs averaged 26.9 °C, night-time lows 17.9 °C. The highest value of the past 10 years was 37.4 °C (6 Sep 2026), the lowest 8.4 °C (27 Sep 2020).
- How often does it rain in Barcelona in September?
- On average there were 10.7 rain days (at least 1 mm) with 69.7 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)