The lack of sunlight during the evening hours will keep your car from being less likely to develop water spots during the wash. While you could prevent spots if you add a ceramic coating over your vehicle, you can still keep them in check by washing your car without too much sunlight.

Washing your car during the day is generally better than at night for several reasons:

Daytime Washing

Pros:

• Visibility: Better natural light allows you to see dirt, scratches, and imperfections more easily, ensuring a thorough clean.
• Drying Time: Sunlight helps the car dry more quickly after washing, reducing the risk of water spots.
• Effective Cleaning Products: Some cleaning products work better when applied in warmer conditions, as they can break down grime more effectively.

Cons:

• Heat: Washing in direct sunlight on a hot day can cause soap and water to dry too quickly, leading to streaks and spots.

Nighttime Washing

Pros:

• Cooler Temperatures: Washing at night can be more comfortable in hot weather, and you won’t have to worry about heat affecting drying time.

Cons:

• Visibility Issues: Limited light can make it harder to see dirt and contaminants, potentially leading to a less effective wash.
• Longer Drying Time: It may take longer for the car to dry at night, especially in humid conditions.

Conclusion

Washing your car during the day is typically preferred, but try to avoid the hottest parts of the day. If you choose to wash at night, ensure you have good lighting to help you see the surfaces clearly.