Dover weather by month & the best time to visit
United States · beach resort · humid subtropical climate
The best time to visit Dover is May — its sunniest month (Sunshine Score 75/100), with September and June close behind. Dover averages about 2,266 hours of sunshine a year. Daytime highs around 23°C / 73°F and roughly 94 mm of rain in May.
When is the best time to visit Dover?
For sunshine, the best time to visit Dover is May, then September and June. The dullest month is January (0/100, 71 mm of rain). The full month-by-month picture is in the table below.
How sunny is Dover?
Dover gets a moderate 2,266 hours of sunshine a year. 75 Sunshine Score points separate May (75) from January (0), so the month you pick matters. It ranks #295 of 580 destinations in United States for annual sunshine, below the national median of 2,279 hours. The year's 1,152 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 0 | 5° / 41°F | -3° / 27°F | 71 mm | 1 | 5° / 41°F |
| February | 0 | 6° / 43°F | -2° / 28°F | 73 mm | 2 | 5° / 41°F |
| March | 19 | 11° / 52°F | 1° / 34°F | 89 mm | 4 | 9° / 48°F |
| April | 57 | 17° / 63°F | 7° / 45°F | 91 mm | 5 | 13° / 55°F |
| May | 75 | 23° / 73°F | 12° / 54°F | 94 mm | 6 | 19° / 66°F |
| June | 72 | 28° / 82°F | 18° / 64°F | 110 mm | 7 | 26° / 79°F |
| July | 71 | 31° / 88°F | 21° / 70°F | 113 mm | 7 | 29° / 84°F |
| August | 71 | 30° / 86°F | 20° / 68°F | 117 mm | 7 | 28° / 82°F |
| September | 73 | 26° / 79°F | 17° / 63°F | 103 mm | 5 | 24° / 75°F |
| October | 72 | 20° / 68°F | 10° / 50°F | 109 mm | 3 | 19° / 66°F |
| November | 32 | 13° / 55°F | 4° / 39°F | 83 mm | 2 | 14° / 57°F |
| December | 0 | 8° / 46°F | 0° / 32°F | 99 mm | 1 | 6° / 43°F |
Sea temperature in Dover by month
The sea off Dover is warmest in July at around 29°C / 84°F, and coolest in January at 5°C / 41°F. The water sits at a comfortable 21°C or warmer roughly 4 months a year. Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
Dover: questions and answers
What kind of destination is Dover?
Dover is a beach resort in United States with a humid subtropical climate — the sea reaches 29°C at its warmest and is swimmable (21°C+) about 4 months a year.
How many hours of sunshine does Dover get a year?
Dover gets about 2,266 hours of sunshine a year, at its best around May.
When is the best time to visit Dover?
The sunniest time to visit Dover is May, when the Sunshine Score peaks at 75/100 (with September and June close behind). Expect daytime highs around 23°C / 73°F.
What is the least sunny month in Dover?
January is the least sunny month in Dover, scoring 0/100 with about 71 mm of rain.
What is the sea temperature in Dover?
The sea in Dover ranges from about 5°C (January) to 29°C (July). Month-by-month sea temperatures are on this page.
How strong is the sun in Dover?
The typical midday UV index in Dover peaks around 7 (high) in June, easing to about 1 (low) in January. Month-by-month midday UV values are in the UV column of the table on this page.
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