Picture link is not working for me. But I would definitely say your problem is to wet soil. From what you say, you probably even watered them too much even when it was in the 90's. Unless you have very well draining soil (which isn't a bad thing), your plants probably didn't need that much water. Peppers like to dry out between waterings. Too much moisture coupled with the cool temps is likely your problem.
Your weather will likely dry up over the next several days and you should be able to let them dry out some. Unless your plants are saying water me now or I will be dead in an hour, don't water them. THey will show wilting signs on 90 degree days regardless but should perk right back up in the evenings....If they don't, then water them.

Bruce

City compost might be your problem.
You don't know what is in it.
Ceder, Caster bean plants, Eucalyptus , Oleander and other plants are bad stuff that might be in the compost.

City compost is anything they collected from the road crews and trash cans from collections.

Ya it's cheap to free but at least here,it has too much broken glass and weird stuff in it.
Friends have used it for raised beds and regretted using it for the most part.
I wouldn't use it for food stuff.
The dirt they mix in the compost is from road work etc. too.
It might also have stuff in it that is OK for roses but not for veggies.
You just don't know what is in it or if you use it for several years the stuff thats bad in it in small amounts might build up to be dangerous after several years of using the stuff.
Some cities are recycling sewage and cutting it with sand etc. so the heavy metals are down to acceptable levels.
What people don't realise is that if you use it for several years,getting a new batch every year,your back yard could end up collecting dangerous amounts of the heavy metals etc. and become real nasty...

Here is a link that might be useful: Stuff that might be in the compost

Maybe this link to the picture will work. http://www.flickr.com/photos/79994556@N04/7161834947/

Yikes! I knew there was some junk in the compost, but I didn't know they might use sewage or road dirt! I imagine that could have petrolium products in it.

I think I'll have to stick with it this year, but change it out next year. The peppers seem to be growing okay, just showing some type of stress. I tend to agree with Bruce... I probably over watered then when we got the downpours and the subsequent cool weather isn't helping.

On a good note, my tomatoes are growing faster than I could ever have imagined in the same soil, but I don't know if that really means anything. I'll try watering only when they start to wilt.

When Bruce says not to over-water, that doesn't mean under-water either. Although pepper plants can withstand dryish soil, it does not mean they like it. Waiting until they are panting for water is not a great idea.

I myself got hung up on this over-watering issue and I had hard roots on one particular plant starting to reach through to the surface. That's a sign of under-watering.

Just use good judgement when watering. If you feel they might need a watering, give them a bit. It won't hurt.

They just don't need to be constantly saturated is all.

Before making a decision about using city compost,check out what your particular state or city allows to be put in it.

Not all cities use the same stuff.

I do know that a few cities are trying to sell treated sewage by products mixed with sand to get out of paying to get rid of the stuff.
They cut it with sand so it is under the safety standards for heavy metals.

But as I said before,if you use a new batch every year,how much of the bad stuff collects in your garden to become too much.

They don't test for drug residue I don't think either.

Fish etc. are beginning to be effected by hormones and medicines people use that are ending up getting into our water supply.

A lot of stuff gets flushed...

Might be safe by their tests but how long does it take to collect/leach out in your back yards soil to be of concern?

Kellogs Grow Mulch is recyled sewage sludge but it says it's not fit for food gardens.
All some cities are doing is cutting it with dirt so the levels of heavy metals is below the safety standards.

Your city compost might be cool.
You have to ask what they use to make it.
California might be less stringent with what they allow,I don't know.
I guess you could look out at night and see if your peppers are glowing. :)

I'll have to do a little detective work on the compost. It does contain lots of foreign material like action figures, boxer short waist bands and a couple pieces of glass.

I can't imagine California would be LESS stringent, but who knows. I don't care to take the chance. Soon, I'll be the one glowing!