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 1981 to 2010 for the NOAA National Climatic Data Center.

Average September temperatures
High °F Low °F Place High °C Low °C
73 57 Block Island 23 14
75 52 Kingston 24 11
72 58 Newport 22 15
71 52 North Foster 22 11
74 55 Providence 23 13
74 56 Tiverton 24 13
72 54 Westerly 22 12
74 52 Woonsocket 24 11

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 1981 to 2010. 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
7 Block Island 3.4 86
9 Kingston 4.2 107
10 Newport 4.0 102
10 North Foster 4.1 104
9 Providence 3.9 100
9 Tiverton 3.7 95
Westerly 3.9 100
10 Woonsocket 3.9 100

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
References

National Climatic Data Center. Comparative Climatic Data.

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

World Data Center for Meteorology. Climate of the World.

More Rhode Island Weather Information

Rhode Island Weather
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