Weather in United States in July

July climate overview

Daytime highs across United States in July run from 27.5°C (Hawaii) to 38.9°C (Las Vegas). In Las Vegas about 100% of July days reach 25°C. Nights average 24.2°C; the coldest 10% of nights in Hawaii fall to 23°C or below.

Rainfall in July

Expect around 14 rainy days (1 mm or more) in July, with Las Vegas the driest (2 days) and Orlando the wettest (23 days). The wettest July at Las Vegas between 1991 and 2020 was 2017 with 36 mm; the driest was 1993 with 0 mm.

Sea temperature

The sea averages 26.9°C around United States in July - warmest at Florida (29.5°C). That is comfortable for swimming.

Sunshine and daylight

Around 6.7 hours of sunshine a day on average, out of 14.2 hours of daylight (sunshine estimated from cloud cover).

July against the rest of the year in United States

July is the 1st warmest month of the twelve in United States. It is 1.4°C warmer than June and 0.3°C cooler in August. The hottest month here is July (31°C) and the coolest January (18°C).

Which part of United States in July?

• Most sunshine: Las Vegas, 11.0 h a day.
• Driest: Las Vegas, about 2 rainy days.
• Warmest sea: Florida, 30°C.
• Hottest: Las Vegas, 39°C by day - intense for sightseeing.
• Coolest (better for walking and cities): Hawaii, 28°C.

What to pack for United States in July

Based on the averages: light, loose clothing and serious sun protection - midday highs sit around 31°C; a rain jacket - roughly 14 wet days; swimwear - the sea is 27°C.

Similar weather elsewhere in July

Within 1.5°C of United States's July daytime average: Madrid (32°C), Hanoi (32°C), Agadir (32°C, sea 20°C), Sicily (32°C, sea 25°C), Bangkok (32°C, sea 30°C). See the full ranking for July.

Hawaii and New York for more manageable heat

Hawaii is a good fit if you want warmth without the highest temperatures in this selection. Days average 28°C, the sea is 26°C and there are 8 rainy days, making it a better choice than Florida if fewer wet days matter to you. Nights stay warm at 24°C, so lightweight clothing remains useful after dark. New York also averages 28°C by day, but its 20°C nights offer more relief from the heat. With 11 rainy days, keep an indoor alternative in mind rather than planning every day entirely outdoors. Neither destination is cool, but both are easier choices for travellers who find intense heat tiring.

Florida for warm water, with rain in the picture

Florida's main weather advantage is its 30°C sea, which suits travellers who dislike a chilly swim. The catch is rain: Florida averages 21 rainy days, Miami 20 and Orlando 23. Those figures do not tell you how long rain lasts, so they are a reason for flexible plans rather than a promise of washed-out days. Daytime temperatures sit around 30°C to 31°C, while nights remain warm across these destinations. Pack light clothing and rain protection, and make sure you are comfortable sleeping in warm conditions. This is a better match for warm-water swimming than for travellers whose priority is avoiding rain.

Las Vegas for dry weather, but demanding heat

Las Vegas is the hottest option here, averaging 39°C by day and 26°C at night. Its 2 rainy days make rain much less of a planning concern than in Florida, but that does not make it the easiest weather for spending long periods outside. Put outdoor time towards the cooler parts of the day, take shade and water seriously, and plan indoor breaks around midday. Evenings are still warm rather than refreshing, so do not expect darkness to bring cool conditions. July suits travellers who tolerate strong heat and are happy to organise their days around it; Hawaii is the gentler alternative.