When to go · Diamond Bar
Diamond Bar, month by month
The best months for Diamond Bar: Mar, Apr, May, Oct, Nov. Months to avoid: Jan, Feb, Jul, Aug, Dec.
Month by month
- JanuaryAvoidListed as a month to avoid: Jul–Aug (hot), Dec–Feb (rainy).19 °C (66 °F) / 8 °C (46 °F), 6 rain days66 °F (19 °C) / 46 °F (8 °C), 6 rain daysCrowds: Low
- FebruaryAvoidListed as a month to avoid: Jul–Aug (hot), Dec–Feb (rainy).19 °C (66 °F) / 8 °C (46 °F), 6 rain days66 °F (19 °C) / 46 °F (8 °C), 6 rain daysCrowds: Low · 1 festival or holiday
- MarchGreatInside Diamond Bar's best window: Mar–May, Oct–Nov.21 °C (70 °F) / 9 °C (48 °F), 5 rain days70 °F (21 °C) / 48 °F (9 °C), 5 rain daysCrowds: Medium · 2 festivals or holidays
- AprilGreatInside Diamond Bar's best window: Mar–May, Oct–Nov.23 °C (73 °F) / 11 °C (52 °F), 3 rain days73 °F (23 °C) / 52 °F (11 °C), 3 rain daysCrowds: Medium · 1 festival or holiday
- MayGreatInside Diamond Bar's best window: Mar–May, Oct–Nov.25 °C (77 °F) / 13 °C (55 °F), 1 rain days77 °F (25 °C) / 55 °F (13 °C), 1 rain daysCrowds: Medium · 1 festival or holiday
- JuneGoodOutside the best window (Mar–May, Oct–Nov). Across United States: Rockies and northern parks open; desert heat builds; hurricane season starts. Book parks months ahead.28 °C (82 °F) / 16 °C (61 °F), 1 rain days82 °F (28 °C) / 61 °F (16 °C), 1 rain daysCrowds: High
- JulyAvoidListed as a month to avoid: Jul–Aug (hot), Dec–Feb (rainy).31 °C (88 °F) / 18 °C (64 °F), 0 rain days88 °F (31 °C) / 64 °F (18 °C), 0 rain daysCrowds: High · 1 festival or holiday
- AugustAvoidListed as a month to avoid: Jul–Aug (hot), Dec–Feb (rainy).32 °C (90 °F) / 19 °C (66 °F), 0 rain days90 °F (32 °C) / 66 °F (19 °C), 0 rain daysCrowds: High
- SeptemberGoodOutside the best window (Mar–May, Oct–Nov). Across United States: After Labor Day the crowds drop and parks stay open; Florida and the Gulf are at hurricane peak.30 °C (86 °F) / 17 °C (63 °F), 1 rain days86 °F (30 °C) / 63 °F (17 °C), 1 rain daysCrowds: Medium · 1 festival or holiday
- OctoberGreatInside Diamond Bar's best window: Mar–May, Oct–Nov.26 °C (79 °F) / 14 °C (57 °F), 2 rain days79 °F (26 °C) / 57 °F (14 °C), 2 rain daysCrowds: Medium
- NovemberGreatInside Diamond Bar's best window: Mar–May, Oct–Nov.22 °C (72 °F) / 10 °C (50 °F), 3 rain days72 °F (22 °C) / 50 °F (10 °C), 3 rain daysCrowds: Medium · 1 festival or holiday
- DecemberAvoidListed as a month to avoid: Jul–Aug (hot), Dec–Feb (rainy).19 °C (66 °F) / 8 °C (46 °F), 5 rain days66 °F (19 °C) / 46 °F (8 °C), 5 rain daysCrowds: High · 1 festival or holiday
Compare two months
Weather, crowds and prices for any two months in Diamond Bar, side by side.
Verdict
Mar: Great
Apr: Great
Daytime high
Mar: 21 °C (70 °F)70 °F (21 °C)
Apr: 23 °C (73 °F)73 °F (23 °C)
Night low
Mar: 9 °C (48 °F)48 °F (9 °C)
Apr: 11 °C (52 °F)52 °F (11 °C)
Rain days
Mar: 5
Apr: 3 (better)
Crowds
Mar: Medium
Apr: Medium
Prices
Mar: Medium
Apr: Medium
Festivals listed
Mar: 2
Apr: 1
March: Inside Diamond Bar's best window: Mar–May, Oct–Nov.
April: Inside Diamond Bar's best window: Mar–May, Oct–Nov.
Diamond Bar: figures are long-term averages from this guide, not a forecast.