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United States Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

United States year round climate

  • Spring (March–May): Average 4.1–16.9°C, the climate gradually transitions from cold to warm, with rainfall gradually increasing. March still has a chilly feel, while May is warm and comfortable. Common activities: Outdoor walks, flower viewing. Suggested clothing: Layered clothing, such as warm underlayers, jackets, and comfortable long pants.
  • Summer (June–August): Average 23.2–25.4°C, warm climate, July is the wettest month with heavier rainfall. Common activities: Camping, hiking, water activities. Suggested clothing: Light and breathable clothing, short sleeves, shorts, and rain gear.
  • Autumn (September–November): Average 12.9–21.2°C, the climate transitions from warm to cool, with decreasing rainfall. September remains comfortably warm, while November gradually turns cold. Common activities: Autumn scenery viewing, outdoor leisure. Suggested clothing: Light jackets, long-sleeved shirts, and an extra layer for the mornings and evenings.
  • Winter (December–February): Average -3.4–0.5°C, cold climate, with less rainfall. January is the coldest month, and warmth is essential. Common activities: Indoor activities, skiing (if there are nearby ski resorts). Suggested clothing: Heavy coats, scarves, gloves, hats, and other warm clothing.

United States climatological average

Annual average temperature: approx. 11.8°C / Annual rainfall: approx. 448 mm / Summer humidity: 60%–70% / Rainiest month: July

United States monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
-3.4°C
28.5
February
0.5°C
21.3
March
4.1°C
32
April
11.3°C
16.6
May
16.9°C
71.2
June
23.2°C
69.6
July
25.4°C
81.6
August
25.4°C
33.5
September
21.2°C
34.1
October
12.9°C
16.3
November
4.7°C
22.7
December
-0.5°C
20.9

United States weather for the next seven days

3/18
Wednesday
Sunny
27.9°C/5°C
3/19
Thursday
Sunny
29.4°C/5.4°C
3/20
Friday
Sunny
28.1°C/8.2°C
3/21
Saturday
Sunny
34°C/9.7°C
3/22
Sunday
Sunny
20.1°C/9.5°C
3/23
Monday
Sunny
17.3°C/3.5°C
3/24
Tuesday
Partly Cloudy
26.2°C/7.1°C

United States Frequently Asked Questions and Useful Information for Travel

What is the general travel advisory level for the United States?

The U.S. government's Smart Traveler Enrollment Program generally lists the United States at a Level 1: Exercise Normal Precautions. This signifies the lowest advisory level, indicating that travelers should exercise normal safety and security precautions.

What does a Level 1 travel advisory mean for the United States?

A Level 1 travel advisory for the United States means 'Exercise Normal Precautions.' This is the lowest risk level, advising travelers to be aware of their surroundings and take standard safety measures, similar to what one would do in any familiar environment.

Why are travel advisories issued for any country, including the United States?

Travel advisories are issued to inform travelers about potential safety, security, health, or other risks in a destination that might differ from their home country. For the United States, advisories can be triggered by localized crime rates, specific health concerns, or natural disaster preparedness, helping travelers make informed decisions.

What are common reasons for travel warnings to be issued?

Common reasons for travel warnings globally and sometimes within specific regions of the United States include high levels of crime, especially violent or organized crime, potential for terrorist threats, and significant political or social instability. These advisories aim to ensure traveler safety by highlighting known risks.

How can I stay informed about travel advisories for the United States?

To stay informed about travel advisories for the United States, you should regularly check official government sources such as the U.S. Department of State's travel advisories. These provide the most current and specific information regarding safety and security conditions across different regions.