When is the best time to go to Port Jefferson
The chart above shows the best time of year to visit Port Jefferson, United States. These are based on an analysis of weather averages such as temperature, rainfall and number of hours of sunshine. These ratings are based solely on the climate and do not take into account other factors such as accommodation prices and how busy it is likely to be.
Average temperatures in Port Jefferson
Port Jefferson weather by month
Please note our recommendations for when to visit Port Jefferson are based solely on the weather and do not take into accounts accommodation prices, how busy it will be and what events are on.
January
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 3°C | 92mm | 6.1hrs | 10.6hrs | 7°C |
The weather in January in Port Jefferson is characteristically cold and a little damp.
Based on weather alone, this is probably a time of year to avoid going to Port Jefferson for your holidays. The weather is often pretty bad and not conducive to spending time outdoors.
January is in the winter in Port Jefferson and is typically the coldest month of the year. Daytime maximum temperatures average around a freezing 3°C (38°F), whilst at night -5°C (23°F) is normal.
On average January is the driest month of the year in Port Jefferson with around 92mm 3.6 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 10 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.1 hours of sunshine per day.
Port Jefferson weather in January »
February
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 4°C | 84mm | 6.9hrs | 11.6hrs | 5°C |
February in Port Jefferson is generally a little damp with the temperature being cold.
Based on weather alone, this is probably a time of year to avoid going to Port Jefferson for your holidays. The weather is often relatively bad and not conducive to spending time outdoors.
February is in the winter in Port Jefferson and is typically the 2nd coldest month of the year. Daytime maximum temperatures average around a freezing 4°C (39°F), whilst at night -5°C (24°F) is normal.
On average February is the 2nd driest month of the year in Port Jefferson with around 84mm 3.3 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 10 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.9 hours of sunshine per day.
Port Jefferson weather in February »
March
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 8°C | 107mm | 7.8hrs | 12.8hrs | 5°C |
The weather in March in Port Jefferson is characteristically cool and damp.
Based on weather alone, this is probably a time of year to avoid going to Port Jefferson for your holidays. The weather is often pretty bad and not conducive to spending time outdoors.
March is in the spring in Port Jefferson and is typically the 3rd coldest month of the year. Daytime maximum temperatures average around a cold 9°C (48°F), whilst at night -1°C (31°F) is normal.
On average March is the 3rd driest month of the year in Port Jefferson with around 107mm 4.2 inches of rain making it a damp time to visit. This rainfall is typically spread over 11 days, although this may vary considerably.
On the flip side this corresponds to an average of 7.8 hours of sunshine per day.
Port Jefferson weather in March »
April
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 13°C | 104mm | 8.5hrs | 14.2hrs | 7°C |
Port Jefferson's weather in April is typically cool and damp in nature.
Based on weather alone, this is probably a time of year to avoid going to Port Jefferson for your holidays. The weather is often relatively bad and not conducive to spending time outdoors.
April is in the spring in Port Jefferson and is typically the 4th coldest month of the year. Daytime maximum temperatures average around a cool 15°C (59°F), whilst at night 4°C (39°F) is normal.
On average April is the 4th driest month of the year in Port Jefferson with around 104mm 4.1 inches of rain making it a damp time to visit. This rainfall is typically spread over 10 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.5 hours of sunshine per day.
Port Jefferson weather in April »
May
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 18°C | 96mm | 9hrs | 15.4hrs | 11°C |
May is a a little damp month in Port Jefferson and the temperature is generally mild.
It is perhaps the perfect month to visit Port Jefferson, with some extremely good weather at this time of year.
May is in the spring in Port Jefferson and is typically the 5th coldest month of the year. Daytime maximum temperatures average around 20°C (69°F), whilst at night 9°C (49°F) is normal.
On average May is the 5th driest month of the year in Port Jefferson with around 96mm 3.8 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 11 days, although this may vary considerably.
On the flip side this corresponds to an average of 9 hours of sunshine per day.
Port Jefferson weather in May »
June
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 23°C | 88mm | 9.5hrs | 10.6hrs | 17°C |
The weather in June in Port Jefferson is characteristically warm and a little damp.
It is perhaps the perfect month to visit Port Jefferson, with some inordinately good weather at this time of year.
June is in the summer in Port Jefferson and is typically the 6th coldest month of the year. Daytime maximum temperatures average around 25°C (77°F), whilst at night 15°C (58°F) is normal.
On average June is the 6th driest month of the year in Port Jefferson with around 88mm 3.5 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 10 days, although this may vary considerably.
On the flip side this corresponds to an average of 9.5 hours of sunshine per day.
Port Jefferson weather in June »
July
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 25°C | 88mm | 9.4hrs | 11.6hrs | 22°C |
July in Port Jefferson is generally a little damp with the temperature being warm.
It is perhaps the perfect month to visit Port Jefferson, with some very good weather at this time of year.
July is in the summer in Port Jefferson and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a muggy 28°C (82°F), whilst at night 18°C (64°F) is normal.
On average July is the 6th wettest month of the year in Port Jefferson with around 88mm 3.5 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.
On the flip side this corresponds to an average of 9.4 hours of sunshine per day.
Port Jefferson weather in July »
August
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 24°C | 99mm | 9.1hrs | 12.8hrs | 23°C |
The weather in August in Port Jefferson is characteristically warm, humid and a little damp.
It is perhaps the perfect month to visit Port Jefferson, with some particularly good weather at this time of year.
August is in the summer in Port Jefferson and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a muggy 27°C (81°F), whilst at night 18°C (64°F) is normal.
On average August is the 5th wettest month of the year in Port Jefferson with around 99mm 3.9 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.
On the flip side this corresponds to an average of 9.1 hours of sunshine per day.
Port Jefferson weather in August »
September
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 21°C | 89mm | 8hrs | 14.2hrs | 21°C |
Port Jefferson's weather in September is typically warm and a little damp in nature.
It is perhaps the perfect month to visit Port Jefferson, with some surprisingly good weather at this time of year.
September is in the fall / autumn in Port Jefferson and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (74°F), whilst at night 14°C (57°F) is normal.
On average September is the 4th wettest month of the year in Port Jefferson with around 89mm 3.5 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.
On the flip side this corresponds to an average of 8 hours of sunshine per day.
Port Jefferson weather in September »
October
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 16°C | 90mm | 7.4hrs | 15.4hrs | 17°C |
October is a a little damp month in Port Jefferson and the temperature is generally mild.
It is perhaps a good month to visit Port Jefferson, with some particularly good weather at this time of year.
October is in the fall / autumn in Port Jefferson and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around 18°C (64°F), whilst at night 9°C (47°F) is normal.
On average October is the 3rd wettest month of the year in Port Jefferson with around 90mm 3.5 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.
On the flip side this corresponds to an average of 7.4 hours of sunshine per day.
Port Jefferson weather in October »
November
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 11°C | 107mm | 5.5hrs | 10.6hrs | 13°C |
November in Port Jefferson is generally damp with the temperature being cool.
Based on weather alone, this is probably a time of year to avoid going to Port Jefferson for your holidays. The weather is often pretty bad and not conducive to spending time outdoors.
November is in the fall / autumn in Port Jefferson and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a cool 12°C (54°F), whilst at night 4°C (39°F) is normal.
On average November is the 2nd wettest month of the year in Port Jefferson with around 107mm 4.2 inches of rain making it a damp time to visit. This rainfall is typically spread over 11 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.5 hours of sunshine per day.
Port Jefferson weather in November »
December
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 5°C | 106mm | 5.1hrs | 11.6hrs | 10°C |
December in Port Jefferson is generally damp with the temperature being cool.
Based on weather alone, this is probably a time of year to avoid going to Port Jefferson for your holidays. The weather is often relatively bad and not conducive to spending time outdoors.
December is in the winter in Port Jefferson and is typically the warmest month of the year. Daytime maximum temperatures average around a cold 6°C (43°F), whilst at night -2°C (29°F) is normal.
On average December is the wettest month of the year in Port Jefferson with around 106mm 4.2 inches of rain making it a damp time to visit. This rainfall is typically spread over 11 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.1 hours of sunshine per day.
Other monthly averages
Port Jefferson weather stats
| Hottest month: | July | 27.6°C 81.7°F |
|---|---|---|
| Driest month: | February | 84mm 3.3ins |
| Sunniest month: | August | 9.1hrs |
| Coldest month: | January | 2.9°C 37.2°F |
| Wettest month: | November | 107mm 4.2ins |
| Warmest sea: | August | 22.8°C 73°F |
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