Grantham Climate by Month
Grantham, England, United Kingdom
Mild summers and cool winters, with rain spread through the year.
Mild summers and cool winters, with rain spread through the year: that's Grantham's climate in short. Expect highs of 72°F (22°C) in July and 44°F (7°C) in January, with the coldest nights (February) near 35°F (2°C). About 26 in (661 mm) of rain falls in a typical year, with no clear rainy season. The air is humid, averaging 80% relative humidity.
- Warmest month
- 72°F(22°C)
- Average high, July
- Coldest nights
- 35°F(2°C)
- Average low, February
- Rain per year
- 26 in(661 mm)
- No clear rainy season
- Humidity
- 80%
- Sunniest: June
Best and worst months in Grantham
Best for weatherJuly and August are the best time for weather in Grantham: highs near 71°F (22°C) and about 2.6 in (65 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; January is the coldest, with highs of only 44°F (7°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in July.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Grantham weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 44°F(7°C) | 35°F(2°C) | 2.0 in(51 mm) | 84% | 0.7 |
| FebFebruary | 46°F(8°C) | 35°F(2°C) | 1.7 in(44 mm) | 83% | 1.3 |
| MarMarch | 50°F(10°C) | 37°F(3°C) | 1.6 in(40 mm) | 82% | 2.5 |
| AprApril | 56°F(13°C) | 40°F(5°C) | 1.8 in(46 mm) | 79% | 3.6 |
| MayMay | 62°F(17°C) | 45°F(7°C) | 1.8 in(46 mm) | 72% | 4.7 |
| JunJune | 67°F(20°C) | 51°F(10°C) | 2.4 in(61 mm) | 71% | 4.8 |
| JulJulyBest | 72°F(22°C) | 54°F(12°C) | 2.4 in(62 mm) | 72% | 4.7 |
| AugAugustBest | 71°F(22°C) | 54°F(12°C) | 2.7 in(68 mm) | 73% | 4.0 |
| SepSeptember | 65°F(18°C) | 50°F(10°C) | 2.2 in(57 mm) | 81% | 2.9 |
| OctOctober | 57°F(14°C) | 45°F(7°C) | 2.6 in(65 mm) | 86% | 1.6 |
| NovNovember | 50°F(10°C) | 40°F(4°C) | 2.4 in(62 mm) | 90% | 0.8 |
| DecDecember | 45°F(7°C) | 36°F(2°C) | 2.3 in(59 mm) | 82% | 0.5 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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