How warm is it in Nassau in September?

Daytime highs averaged 29.8 °C, night-time lows 28.7 °C. The highest value of the past 10 years was 31.4 °C (18 Sep 2023), the lowest 26.6 °C (25 Sep 2019).

How often does it rain in Nassau in September?

On average there were 22.3 rain days (at least 1 mm) with 161 mm of precipitation in total.

How warm is the sea in Nassau in September?

The sea temperature averaged 30.3 °C (open-sea point approx. 6 km from the town).

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Nassau weather in September: temperature & rain

Photo: Rüdiger Stehn from Kiel, Deutschland · CC BY-SA 2.0

🇧🇸 Weather in Nassau in September

This is what the weather in Nassau (Bahamas) was like in September over the years 2017–2026.

Key facts at a glance

Prevailing weather: Light rain

Avg. daytime high

29.8 °C

29.1 °C – 30.2 °C

Avg. night-time low

28.7 °C

28.2 °C – 29.1 °C

Avg. rain days in period

22.3

74 % of days · ≥ 1.0 mm

Avg. precipitation in period

161 mm

93.4 mm – 438 mm

Avg. cloud cover

60 %

This data source has no sunshine hours – average cloud cover is shown instead.

Avg. sea temperature

30.3 °C

Sea temperature available for 3 of 10 years.

Extremes: Highest temperature 31.4 °C (18 Sep 2023) · Lowest temperature 26.6 °C (25 Sep 2019) · Avg. daily peak wind 22 km/h

Weather mix of all days

31Sunny
36Partly cloudy
7Cloudy
127Light rain
96Rain

Summary

On average 29.8 °C during the day and 28.7 °C at night.
On average 22.3 rain days (Rain day = at least 1.0 mm of precipitation) with 161 mm of precipitation in total.
The sea averaged 30.3 °C.
Prevailing weather: Light rain.
Warmest year: 2024 (avg. 30.2 °C), coolest: 2019 (avg. 29.1 °C).
Wettest year: 2025 (438 mm), driest: 2017 (93.4 mm).
Extremes: 31.4 °C on 18 Sep 2023 and 26.6 °C on 25 Sep 2019.

Overall values from all 10 years. How is this calculated?

Temperatures per year

Average over your travel period

Precipitation & rain days

Year by year

2026
Avg. max30.2°Avg. min29.0°
Rain days
27 Rain days
Precipitation
160 mm
Avg. cloud cover
–
Sea temperature
30.6 °C
Max 31.1 °C · Min 27.6 °C
2025
Avg. max29.9°Avg. min28.7°
Rain days
29 Rain days
Precipitation
438 mm
Avg. cloud cover
80 % cloudy
Sea temperature
30.3 °C
Max 30.9 °C · Min 27.7 °C
2024
Avg. max30.2°Avg. min29.1°
Rain days
22 Rain days
Precipitation
119 mm
Avg. cloud cover
65 % cloudy
Sea temperature
30.0 °C
Max 31.0 °C · Min 28.2 °C
2023
Avg. max30.0°Avg. min28.9°
Rain days
20 Rain days
Precipitation
104 mm
Avg. cloud cover
59 % cloudy
Sea temperature
–
Max 31.4 °C · Min 27.1 °C
2022
Avg. max30.1°Avg. min28.9°
Rain days
26 Rain days
Precipitation
170 mm
Avg. cloud cover
51 % cloudy
Sea temperature
–
Max 31.0 °C · Min 27.9 °C
2021
Avg. max29.9°Avg. min28.8°
Rain days
26 Rain days
Precipitation
143 mm
Avg. cloud cover
61 % cloudy
Sea temperature
–
Max 31.0 °C · Min 27.8 °C
2020
Avg. max29.3°Avg. min28.5°
Rain days
18 Rain days
Precipitation
154 mm
Avg. cloud cover
68 % cloudy
Sea temperature
–
Max 30.3 °C · Min 27.8 °C
2019
Avg. max29.1°Avg. min28.2°
Rain days
18 Rain days
Precipitation
129 mm
Avg. cloud cover
57 % cloudy
Sea temperature
–
Max 30.2 °C · Min 26.6 °C
2018
Avg. max29.4°Avg. min28.4°
Rain days
20 Rain days
Precipitation
97.5 mm
Avg. cloud cover
53 % cloudy
Sea temperature
–
Max 30.2 °C · Min 27.0 °C
2017
Avg. max29.6°Avg. min28.7°
Rain days
17 Rain days
Precipitation
93.4 mm
Avg. cloud cover
48 % cloudy
Sea temperature
–
Max 30.3 °C · Min 27.3 °C

Frequently asked questions

How warm is it in Nassau in September?: Daytime highs averaged 29.8 °C, night-time lows 28.7 °C. The highest value of the past 10 years was 31.4 °C (18 Sep 2023), the lowest 26.6 °C (25 Sep 2019).
How often does it rain in Nassau in September?: On average there were 22.3 rain days (at least 1 mm) with 161 mm of precipitation in total.
How warm is the sea in Nassau in September?: The sea temperature averaged 30.3 °C (open-sea point approx. 6 km from the town).

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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. Snow depth is the model value for the grid cell, not the depth on the slopes. 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); Sea measuring point approx. 6 km from the location (25.010, -77.310)
Place search: Natural Earth (public domain) · GeoNames (CC BY 4.0) / OpenStreetMap (ODbL)