Delaware Weather in September

Average temperatures, rainfall, sunshine and the best places to visit in Delaware, the United States of America in September.

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Dover Newark Seaford Harrington

Thinking about venturing to Delaware, the United States of America this September and curious about the weather conditions to expect? This page holds all the key information you seek, responding to your question:

What to Expect in Delaware in September

Delaware, the United States of America is a region in the United States of America. September in Delaware generally has warm temperatures, with high precipitation.

Temperatures

You can expect warm maximum daytime temperatures of around 26°C (79°F) and nighttime temperatures around 16°C (61°F) in Dover.

For a closer look at conditions across Delaware, the United States of America, refer to the map below.

Precipitation

In September, precipitation varies across different areas. From high rainfall in Smyrna with an average of 102 mm (4 in) to high rainfall in Seaford with 138 mm (5.4 in).

Explore Delaware by month

Pick a month to see the average temperature, rainfall and sunshine in Delaware — and find the best time to visit. (based on Dover)

January6°C (43°F) February7°C (45°F) March12°C (54°F) April18°C (64°F) May23°C (73°F) June28°C (82°F) This monthJuly31°C (88°F) August29°C (84°F) September26°C (79°F) October20°C (68°F) November14°C (57°F) December10°C (50°F)
Best Time to Visit Delaware →

Best Places to Visit in Delaware in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Delaware.

Conditions Temperatures Precipitation
perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Delaware

What is the weather like in September for some of the most popular destinations in Delaware, the United States of America?

Temperature range in Delaware (September)

Precipitation variation in Delaware (September)

Dover

In September Dover generally has high temperatures with maximum daytime temperatures around 26°C (79°F), minimum nighttime temperatures around 16°C (61°F) and high monthly rainfall. So on average the conditions are pleasant that month.

« August
September
October »
August
September
October
Max temperature
29°C (84°F)
26°C (79°F)
20°C (68°F)
Min temperature
20°C (68°F)
16°C (61°F)
10°C (50°F)
Monthly rainfall
110 mm (4.3 in)
109 mm (4.3 in)
143 mm (5.6 in)
Monthly rainy days
11 days
8 days
11 days
Weather conditions
pleasant
pleasant
pleasant
Climate in Dover →

Newark

In September Newark generally has high temperatures with maximum daytime temperatures around 26°C (79°F), minimum nighttime temperatures around 15°C (59°F) and high monthly rainfall. So on average the conditions are pleasant that month.

« August
September
October »
August
September
October
Max temperature
29°C (84°F)
26°C (79°F)
19°C (66°F)
Min temperature
18°C (64°F)
15°C (59°F)
8°C (46°F)
Monthly sun hours
260 hours
218 hours
200 hours
Monthly rainfall
118 mm (4.6 in)
118 mm (4.6 in)
129 mm (5.1 in)
Monthly rainy days
10 days
9 days
11 days
Weather conditions
pleasant
pleasant
tolerable
Climate in Newark →

Seaford

In September Seaford generally has high temperatures with maximum daytime temperatures around 27°C (81°F), minimum nighttime temperatures around 16°C (61°F) and high monthly rainfall. So on average the conditions are pleasant that month.

« August
September
October »
August
September
October
Max temperature
30°C (86°F)
27°C (81°F)
21°C (70°F)
Min temperature
19°C (66°F)
16°C (61°F)
10°C (50°F)
Monthly rainfall
110 mm (4.3 in)
138 mm (5.4 in)
138 mm (5.4 in)
Monthly rainy days
10 days
9 days
11 days
Weather conditions
tolerable
pleasant
pleasant
Climate in Seaford →

Harrington

In September Harrington generally has high temperatures with maximum daytime temperatures around 27°C (81°F), minimum nighttime temperatures around 16°C (61°F) and high monthly rainfall. So on average the conditions are pleasant that month.

« August
September
October »
August
September
October
Max temperature
30°C (86°F)
27°C (81°F)
21°C (70°F)
Min temperature
19°C (66°F)
16°C (61°F)
9°C (48°F)
Monthly rainfall
117 mm (4.6 in)
119 mm (4.7 in)
148 mm (5.8 in)
Monthly rainy days
11 days
9 days
12 days
Weather conditions
tolerable
pleasant
pleasant
Climate in Harrington →

Christiana

In September Christiana generally has high temperatures with maximum daytime temperatures around 26°C (79°F), minimum nighttime temperatures around 15°C (59°F) and high monthly rainfall. So on average the conditions are pleasant that month.

« August
September
October »
August
September
October
Max temperature
29°C (84°F)
26°C (79°F)
20°C (68°F)
Min temperature
19°C (66°F)
15°C (59°F)
9°C (48°F)
Monthly sun hours
260 hours
218 hours
200 hours
Monthly rainfall
112 mm (4.4 in)
112 mm (4.4 in)
127 mm (5 in)
Monthly rainy days
9 days
8 days
11 days
Weather conditions
pleasant
pleasant
pleasant
Climate in Christiana →

Is your destination not in the list? Have a look at all destinations in Delaware, in the United States of America.

Popular cities in September

Day & night temperatures, rainfall and average weather in Delaware in September.

City Weather Day temp Night temp Rainfall
Dover 26°C (79°F) 16°C (61°F) 109 mm (4.3 in)
Newark 26°C (79°F) 15°C (59°F) 118 mm (4.6 in)
Seaford 27°C (81°F) 16°C (61°F) 138 mm (5.4 in)
Harrington 27°C (81°F) 16°C (61°F) 119 mm (4.7 in)
Christiana 26°C (79°F) 15°C (59°F) 112 mm (4.4 in)
Delaware City 26°C (79°F) 16°C (61°F) 110 mm (4.3 in)

Delaware weather in September: frequently asked questions

What is the weather like in Delaware, the United States of America in September?

September in Delaware, the United States of America brings pleasant weather. In Dover, daytime temperatures are typically around 26°C (79°F) and nighttime lows hover near 16°C (61°F).

What is the average temperature in Delaware, the United States of America in September?

Average temperatures in Delaware, the United States of America during September range from a nighttime low near 16°C (61°F) to a daytime high around 26°C (79°F) in Dover.

Does Delaware, the United States of America get a lot of rain in September?

Dover typically receives notable rainfall in September, about 109 mm (4.3 in) on average across Delaware, the United States of America.

Is September a Good Time to Visit Delaware, the United States of America?

Given the typically pleasant weather conditions in Dover, September might be a good time to visit Delaware, the United States of America. However, the weather conditions may vary depending on your destination.

Generally speaking, the best visiting conditions can be found in May offering mostly perfect weather in Dover. In contrast, January, February and December tend to have poor weather conditions.

Interested in more climate information?

We have much more information about the climate in Delaware.

Weather and climate has detailed information for every country in the world. Are you going to the United States of America? Get detailed historical weather averages for many cities in the United States of America.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

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