Vacaville, California, USA UV Index in July
The average UV index in Vacaville, California, USA in July is about 7 (High), peaking near 10 at midday on clear days. Fair skin (Type II) can burn in roughly 13 minutes without sunscreen. SPF 30–50 sunscreen, a hat and sunglasses are essential. Seek shade between 11am and 3pm.
What is the UV index in Vacaville, California, USA in July?
Average UV
7
High
Midday Peak
10
Clear-sky estimate
Fair Skin Burn Time
13 min
Type II, no sunscreen
How long can you stay in the sun in Vacaville, California, USA in July?
| Skin type | Time to first burn | With SPF 30 |
|---|---|---|
| Type 1 | 9 min | up to 240 min |
| Type 2 | 13 min | up to 240 min |
| Type 3 | 21 min | up to 240 min |
| Type 4 | 34 min | up to 240 min |
| Type 5 | 51 min | up to 240 min |
| Type 6 | 77 min | up to 240 min |
Estimates based on Vacaville, California, USA's latitude and typical July sun angle. Cloud cover, altitude and reflection from water or sand can raise or lower the real UV. Check the live forecast before long days outside.
Vacaville, California, USA UV Index by Month
When is the UV index highest and lowest in Vacaville, California, USA?
Highest: June (about 7). Lowest: December (about 4.6).
| Month | Average UV | Midday peak | Level | Fair skin burn |
|---|---|---|---|---|
| January | 4.7 | 6.7 | Moderate | 19 min |
| February | 5.3 | 7.6 | Moderate | 17 min |
| March | 6 | 8.6 | High | 15 min |
| April | 6.6 | 9.4 | High | 14 min |
| May | 6.9 | 9.9 | High | 13 min |
| June | 7 | 10 | High | 13 min |
| July | 7 | 10 | High | 13 min |
| August | 6.8 | 9.7 | High | 13 min |
| September | 6.3 | 9 | High | 14 min |
| October | 5.6 | 8 | Moderate | 16 min |
| November | 4.9 | 7 | Moderate | 18 min |
| December | 4.6 | 6.6 | Moderate | 20 min |
Common questions about UV in Vacaville, California, USA in July
Do you need sunscreen in Vacaville, California, USA in July?
Yes. A UV index of 7 is High, so use SPF 30+ on exposed skin between 10am and 4pm and reapply every two hours.
Can you tan in Vacaville, California, USA in July?
Yes, UV of 7 is strong enough to tan. Fair skin can burn in about 13 minutes, so build exposure slowly and use sunscreen.
What time of day is UV strongest in Vacaville, California, USA?
UV peaks around solar noon, roughly 11am to 2pm local time, when it can reach about 10 in July. Mornings and late afternoons are safest.
Is July a good month to visit Vacaville, California, USA for the sun?
July averages UV 7, compared with a yearly high of 7 in June and a low of 4.6 in December. Darker skin (Type VI) can burn in about 77 minutes at this level.