Planning an Outdoor Wedding , from eleGALA.com:

Outdoor weddings are romantic and scenic, but there's a lot that can go wrong. Here's your guide to planning a flummox-free, al fresco wedding.
Outdoor Weddings - Things to Consider:

Who will officiate? Some officiants will only perform ceremonies within a house of worship, so you'll need to check with yours in advance before planning your ceremony outside. 

Inform your guests - Guests need to know they're attending an outdoor wedding so they can dress appropriately. It's also a good idea to send weather information to out-of-town guests who may not be familiar with the climate.

Be prepared - Combat potential outdoor issues by having the following items on hand:
.Bug spray
.Water bottles
.Umbrellas
.Paper fans
.Sunscreen
.Cell phone
.Tissues/paper towels