Update - Going to a coworkers wedding - in 100+ heat

In that heat, I'd do what I had to to stay cool. Bride would be lucky if you didn't show up in a bikini and sun tan lotion!!

Wear what you'll be comfortable in

Even with the uncomfortably hot temps, you need to follow whatever dress code was specified on the invitation. For example, if they requested cocktail attire, a golf shirt would be inappropriate.

In that heat I think a gold shirt would be fine.

Ashley, hell to the no (you shouldn't be specifying a dress code on your invitations anyway, unless it's black tie). If someone has their wedding in 100+ degrees, FH and I are wearing what we need to to not die outside. I think a golf shirt is totally fine!

Dear God! 103 in Oregon? What part? We are getting married on mt hood ( we live in Florida) and are watching the weather out there like a hawk.

As another Oregonian, I'd say a sundress is fine. A golf shirt could work depending on the material.

Is there a dress code?

I agree with @Ashley that you should still follow the dress code. If there is a dress code, maybe we can help with suggestions that will more or less fall into the dress code and will also keep you and your FH close to comfortable in the heat.

My dad once wore a short sleeve dress shirt to my friend's wedding, which was on a 100-degree day in July in a church with no AC! He look silly BUT he didn't have heat stroke lol.

Our wedding will be outdoors in late summer in IL. I put on the invites "our wedding celebration will be outdoors, so please dress comfortably". Some people I don't think realize our wedding is outside, so we wanted to specify on the invite so men didn't show up wearing long sleeves or suits.

@Christine Kyle, the Silcox hut at Timberline Lodge.

As for the dress code for your SO, I would get a light dress shirt, short sleeved with a nice tie. Pastel colors maybe with khaki pants or may be seersucker. (sp).

A golf shirt will be totally fine. People will be dressed for the weather. Don't worry about it.

Golf shirt will be fine. It is high 90s here in Texas and I can't imagine anyone showing up to an outdoor wedding wearing a suit or longsleeve shirt. Anything not to have heat stroke.

Ashley, you shouldn't even be putting a dress code on the invitation. Treat your guests like adults and allow them to wear what they think is appropriate based on the venue and formality of the invitation. In this case since the couple is insisting on having an outdoor wedding I would wear what you are comfortable in. The guests' comfort comes first no matter what the bride wants.

Bring an umbrella and a mister fan! LOL!

UPDATE LATER!

If anyone insisted on having an outdoor wedding in the summer with any type of apparel, I can tell you my partner would decline. I've seen enough miserable groups of guests to prove his point too. You want black tie in the summer? Then go inside where it's air conditioned.

I'm sure you already made your decision, but I just returned from outdoor wedding. It was unseasonably cold, rainy, and windy for NJ so that was not fabulous for different reasons. But before we had the weather forecast and we thought it would be hot and humid I was planning to wear a cotton sundress and FH was going to wear khakis and a golf shirt. We are not casual people and most NJ weddings are more formal but for outside in June you gotta do what you gotta do.

So, he ended up wearing a nice golf shirt with slacks. It was very hot, the wedding was outside of Portland. Like sweat running down your back hot. The ceremony was long and most of us were in direct sunlight. The caterer got a flat tire, and so when the ceremony ended at 4:30, everyone sat around the reception (also outside), with drinks but no food. Dinner was served around 6:30...we left by 7pm and came back to a coworkers house to float in the pool. We were both still covered in sweat and just miserable. I'm not super pleased with the whole experience, but some of it was out of their control. Still not the best wedding experience.

Oh wow, that sucks! At least you got to float in the pool!