Roche Harbor weather by month & the best time to visit
United States · city break · oceanic / maritime climate
The best time to visit Roche Harbor is July — its sunniest month (Sunshine Score 87/100), with August close behind. Roche Harbor averages about 2,004 hours of sunshine a year. Daytime highs around 21°C / 70°F and roughly 18 mm of rain in July.
When is the best time to visit Roche Harbor?
For sunshine, the best time to visit Roche Harbor is July, then August. The dullest month is January (0/100, 147 mm of rain). The full month-by-month picture is in the table below.
How sunny is Roche Harbor?
Roche Harbor gets a moderate 2,004 hours of sunshine a year. 87 Sunshine Score points separate July (87) from January (0), so the month you pick matters. It ranks #408 of 580 destinations in United States for annual sunshine, below the national median of 2,279 hours. Rain has a clear season: the wettest stretch, around December, carries about 44% of the annual 991 mm.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 0 | 7° / 45°F | 4° / 39°F | 147 mm | 0 | 8° / 46°F |
| February | 0 | 7° / 45°F | 4° / 39°F | 84 mm | 1 | 8° / 46°F |
| March | 6 | 9° / 48°F | 5° / 41°F | 106 mm | 2 | 8° / 46°F |
| April | 26 | 12° / 54°F | 7° / 45°F | 70 mm | 4 | 10° / 50°F |
| May | 47 | 15° / 59°F | 9° / 48°F | 52 mm | 5 | 12° / 54°F |
| June | 70 | 18° / 64°F | 11° / 52°F | 37 mm | 6 | 14° / 57°F |
| July | 87 | 21° / 70°F | 13° / 55°F | 18 mm | 7 | 17° / 63°F |
| August | 85 | 21° / 70°F | 14° / 57°F | 27 mm | 6 | 17° / 63°F |
| September | 68 | 18° / 64°F | 12° / 54°F | 50 mm | 4 | 16° / 61°F |
| October | 29 | 13° / 55°F | 9° / 48°F | 109 mm | 2 | 12° / 54°F |
| November | 5 | 9° / 48°F | 6° / 43°F | 154 mm | 1 | 10° / 50°F |
| December | 0 | 7° / 45°F | 4° / 39°F | 137 mm | 0 | 9° / 48°F |
Sea temperature in Roche Harbor by month
The sea off Roche Harbor is warmest in July at around 17°C / 63°F, and coolest in January at 8°C / 46°F. It never reaches comfortable swimming temperatures (21°C+). Month-by-month sea-surface temperatures are in the Sea column of the table above.
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Roche Harbor: questions and answers
What kind of destination is Roche Harbor?
Roche Harbor is a city break in United States with a oceanic / maritime climate — the sea reaches 17°C at its warmest.
How many hours of sunshine does Roche Harbor get a year?
Roche Harbor gets about 2,004 hours of sunshine a year, at its best around July.
When is the best time to visit Roche Harbor?
The sunniest time to visit Roche Harbor is July, when the Sunshine Score peaks at 87/100 (with August close behind). Expect daytime highs around 21°C / 70°F.
What is the least sunny month in Roche Harbor?
January is the least sunny month in Roche Harbor, scoring 0/100 with about 147 mm of rain.
What is the sea temperature in Roche Harbor?
The sea in Roche Harbor ranges from about 8°C (January) to 17°C (July). Month-by-month sea temperatures are on this page.
How strong is the sun in Roche Harbor?
The typical midday UV index in Roche Harbor peaks around 7 (high) in July, easing to about 0 (low) in January. Month-by-month midday UV values are in the UV column of the table on this page.
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