www.weatherbase.com is your source for historical weather.
Depends on marine layer and how far onshore it comes. Temps can vary greatly through the day as the sun breaks through (or doesn't). I've spent time during the summer on the coast when we've needed sweatshirts and windbreakers all day...and times when lots of sunblock cream had to be used and we spent the entire day out on the sand sunbathing. You pay your money and you take your chances.
I've been tracking the weather here in Florence for 20 years. The average low for the month of August, 1/2 mile from the beach is 52.8ºF (11.6ºC) and the average high is 73.7ºF (23.3ºC).
Well, you have picked two locations that will have different weather from each other, even though they are both on the coast and not too far from one another!
And then, to add to oregonpoppa's information, it depends upon just where you are in a town!
For example, if you are on the beach in Newport, it will be anywhere from 4º to 10º F cooler there than if you were just a half mile or mile inland -- still in town. There will be a breeze in summer. Sometimes it's mild, sometimes it's stronger.
Florence is tucked behind sand dunes so I find it's usually a touch warmer there than north of town where you're exposed to the ocean breezes more.
In terms of numbers, it rarely gets over about 65º F near the beaches. (Unless there is a heat wave, of course!)
If you are looking for a warm beach, you need to look farther south.
Thanks for that and very useful website. Thought it would be bit cooler than inland. Am doing new pits re some accommodation.
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