Rialto, California, USA UV Index in July
The average UV index in Rialto, California, USA in July is about 8 (Very High), peaking near 11 at midday on clear days. Fair skin (Type II) can burn in roughly 11 minutes without sunscreen. SPF 50+ sunscreen, protective clothing, hat and sunglasses. Minimise midday sun exposure.
What is the UV index in Rialto, California, USA in July?
Average UV
8
Very High
Midday Peak
11
Clear-sky estimate
Fair Skin Burn Time
11 min
Type II, no sunscreen
How long can you stay in the sun in Rialto, California, USA in July?
| Skin type | Time to first burn | With SPF 30 |
|---|---|---|
| Type 1 | 8 min | up to 240 min |
| Type 2 | 11 min | up to 240 min |
| Type 3 | 19 min | up to 240 min |
| Type 4 | 30 min | up to 240 min |
| Type 5 | 45 min | up to 240 min |
| Type 6 | 68 min | up to 240 min |
Estimates based on Rialto, 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.
Rialto, California, USA UV Index by Month
When is the UV index highest and lowest in Rialto, California, USA?
Highest: June (about 8). Lowest: December (about 5.6).
| Month | Average UV | Midday peak | Level | Fair skin burn |
|---|---|---|---|---|
| January | 5.8 | 8 | Moderate | 16 min |
| February | 6.4 | 8.8 | High | 14 min |
| March | 7.1 | 9.8 | High | 13 min |
| April | 7.6 | 10.5 | High | 12 min |
| May | 7.9 | 10.9 | High | 11 min |
| June | 8 | 11 | Very High | 11 min |
| July | 8 | 11 | Very High | 11 min |
| August | 7.8 | 10.7 | High | 12 min |
| September | 7.3 | 10 | High | 12 min |
| October | 6.7 | 9.2 | High | 13 min |
| November | 5.9 | 8.1 | Moderate | 15 min |
| December | 5.6 | 7.7 | Moderate | 16 min |
Common questions about UV in Rialto, California, USA in July
Do you need sunscreen in Rialto, California, USA in July?
Yes. A UV index of 8 is Very High, so use SPF 30+ on exposed skin between 10am and 4pm and reapply every two hours.
Can you tan in Rialto, California, USA in July?
Yes, UV of 8 is strong enough to tan. Fair skin can burn in about 11 minutes, so build exposure slowly and use sunscreen.
What time of day is UV strongest in Rialto, California, USA?
UV peaks around solar noon, roughly 11am to 2pm local time, when it can reach about 11 in July. Mornings and late afternoons are safest.
Is July a good month to visit Rialto, California, USA for the sun?
July averages UV 8, compared with a yearly high of 8 in June and a low of 5.6 in December. Darker skin (Type VI) can burn in about 68 minutes at this level.