Average September Weather in Rhode Island

Typical temperatures, precipitation, humidity and sunshine during September at cities and towns throughout Rhode Island are listed below.

Temperatures in Rhode Island for September

This table gives the averages in degrees Fahrenheit and Celsius for maximum and minimum monthly temperatures. These normal temperatures are based on weather data collected from 1991 to 2020 for the US National Centers for Environmental Information.

Average September temperatures
High °F Low °F Place High °C Low °C
76 53 Kingston 24 12
73 59 Newport 23 15
72 53 North Foster 22 12
75 57 Providence 24 14
77 57 Tiverton 25 14
74 57 Westerly 24 14
75 54 Woonsocket 24 12

Precipitation in Rhode Island for September

Here are the September averages for rainfall in Rhode Island. Each place has a total for how many days of wet weather it usually gets this month and for the normal amount of precipitation, based on the weather during 1991 to 2020. The calculation of days only includes those when precipitation totalled 0.01 inches (0.25 millimetres) or more.

Average precipitation in September
Days Place Inches Milli­metres
9 Kingston 4.4 111
11 Newport 3.8 97
10 North Foster 4.4 112
9 Providence 4.2 106
9 Tiverton 3.9 100
10 Westerly 3.8 97
10 Woonsocket 4.2 106

Sunshine in Rhode Island for September

In the table below, the average number of Sunny Days in Rhode Island is the total days this month when the sky is mostly clear. This includes the days when cloud covers up to 30% of the sky during daylight hours.

Partly Sunny Days have cloud covering from 40% to 70% of the sky during the daytime. The rest of the days during September are mainly overcast, with at least 80% cloud cover. Total Days With Sun is a sum of the Sunny plus Partly Sunny days.

Days of sunshine in September
City Sunny Partly Sunny Total Days
With Sun
Block Island 10 9 19
Providence 9 8 17

Humidity in Rhode Island

In the table below, the Daily number is the average of relative humidity readings taken every three hours throughout the day. Morning percentages are for 7 am and Afternoon levels are for 4 pm local standard time. All the humidity numbers are averages for the years 1961 to 1990.

Average September humidity (%)
Daily City Morning Afternoon
73 Providence 82 59

National Climatic Data Center. Comparative Climatic Data.

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

World Data Center for Meteorology. Climate of the World.

More Rhode Island Weather Information

Rhode Island Weather
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